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MINISTRY OF
INDUSTRY AND TRADE |
SOCIALIST
REPUBLIC OF VIETNAM |
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No. 39/2020/TT-BCT |
Hanoi, November 30, 2020 |
INTRODUCING THE NATIONAL TECHNICAL REGULATION ON ELECTRIC SAFETY
Pursuant to the Law on Technical Standards and Regulations dated June 29, 2006;
Pursuant to the Government's Decree No. 98/2017/ND-CP dated August 18, 2017, defining the functions, tasks, powers and organizational structure of the Ministry of Industry and Trade;
Pursuant to the Government's Decree No. 127/2007/ND-CP dated August 1, 2007, elaborating and providing guidance on the implementation of a number of articles of the Law on Technical Standards and Regulations, and the Government's Decree No. 78/2018/ND-CP dated May 16, 2018 on amendments and supplements to the Government's Decree No. 127/2007/ND-CP dated August 1, 2007, elaborating and providing guidance on the implementation of a number of articles of the Law on Technical Standards and Regulations;
Pursuant to the Government’s Decree No. 14/2014/ND-CP dated February 26, 2014, elaborating on the implementation of the Law on Electricity in terms of electric safety, and the Government’s Decree No. 51/2020/ND-CP dated April 21, 2020 on amendments to several Articles of the Government’s Decree No. 14/2014/ND-CP dated February 26, 2014, elaborating on the implementation of the Law on Electricity in terms of electric safety;
Upon the request of the Director of the Industrial Safety Techniques and Environment Agency;
The Minister of Industry and Trade herein promulgates the Circular introducing the National Technical Regulation on electric safety.
Article 1. Introduction of the National Technical Regulation on electric safety
Reference number: QCVN 01: 2020/BCT
1. This Circular shall enter into force as from June 1, 2021.
2. The Decision No. 12/2008/QD-BCT dated June 17, 2008 of the Minister of Industry and Trade, introducing the National Technical Regulation on Electric Safety QCVN 01:2008/BCT, shall be invalidated from the effective date of this Circular.
1. Ministers, Heads of Ministry-level agencies, Heads of Governmental bodies, Presidents of People’s Committees of centrally-affiliated cities and provinces, other organizations and individuals involved shall be responsible for enforcing this Circular./.
2. In the course of implementing this Circular, should there be any issue that arises, persons and entities may send timely feedback to the Ministry of Industry and Trade to request its review and action./.
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MINISTER |
NATIONAL TECHNICAL REGULATION ON ELECTRIC SAFETY
Foreword
QCVN 01:2020/BCT replacing QCVN 01:2008/BCT is appended to the Decision No. 12/2008/QD-BCT dated June 17, 2008 of the Minister of Industry and Trade.
The full text of QCVN 01:2020/BCT is composed by the Commission on Writing of National Technical Regulation on Electric Safety; is submitted for approval by the Industrial Safety Techniques and Environment Agency; is reviewed and made available for use as appended to the Circular No. 39/2020/TT-BCT dated November 30, 2020 of the Minister of Industry and Trade.
NATIONAL TECHNICAL REGULATION ON ELECTRIC SAFETY
This Regulation deals with safety precautions for the construction, operation, business, testing, inspection and repair of electrical lines, electrical equipment and other types of work according to regulatory provisions.
This Regulation applies to all organizations and individuals engaged in electricity activities and using electricity for production in the territory of Vietnam.
For the purpose of this Regulation, terms used herein shall be construed as follows:
3.1. Operator is an entity directly managing and operating electricity facilities.
3.2. Contractor is an entity that repairs, tests, inspects, builds, commercially uses and performs other works related to electricity facilities.
3.3. Safe work zone is an area where safety precautions for people and equipment working inside have been established.
3.4. Work request/order issuer is the person who writes work requests/orders on behalf of his/her employing entity, and is required to grasp the work content and electric safety conditions for performing such work.
3.5. Work director is the person responsible for general management of the work performed by multiple contractors under the same electricity entity.
3.6. Direct supervisor is the person who is responsible for assigning, instructing and overseeing a contractor’s staff while they are at work.
3.7. Permission giver is the person who carries out the procedures required to allow a contractor to enter a work site where electric safety has been ensured.
3.8. Electric safety superintendent is the person having electrical safety knowledge who is appointed to supervise electric safety for a contractor.
3.9. Lookout is the person who is appointed to watch out for and alert any workplace safety issue that poses threats to the local community.
3.10. Contractor’s staff is an employee of a contractor who directly performs the work assigned by the direct supervisor.
3.11. Order assignee is someone working on their own according to a work order.
3.12. Work(ing) live is the act of working on energized parts which is conducted by using dedicated tools and equipment.
3.13. Work(ing) dead is the act of working on parts which are de-energized in all directions.
3.14. Work(ing) at height is the act of working at a height of 2 meters or higher which is measured as the distance from the ground/floor level to the lowest point that a worker contacts.
3.15. De-energize (de-energization) or power cut is an act of isolating an energized part from the electric supply.
3.16. Electricity facility (project) is a complex of means, machines, equipment and buildings directly supporting the generation, transmission, distribution, dispatch, sale and purchase of electricity; electricity facility protection systems; electrical grid safety corridors; land used for electricity and other auxiliary facilities.
3.17. High voltage is voltage which is 1000 V or above.
3.18. Low voltage is voltage which 1000 V or below.
II.I. Working with de-energized parts
4. Steps in taking safety precautions before carrying out the work
4.1. Turn off electricity and take measures to prevent power from returning.
4.2. Check whether electricity absolutely goes out.
4.3. Perform earthing (grounding) procedures:
4.3.1. The operator connects the earth to create a safe work zone before handing over the work site.
4.3.2. The contractor sets the additional earth in place in the worksite if necessary to perform the work.
4.4. Set up barricades and put up safety signs:
4.5. Apply other necessary safety precautions subject to the contractor's decisions.
Electrical equipment and lines must be clearly labeled and reference-numbered.
6. Making or breaking circuits to equipment
6.1. Using isolators for making or breaking load currents is prohibited, except for load isolators which are allowed to perform on-load making or breaking functions according to the manufacturer's instructions).
6.2. When operating isolators, it is obligatory to ensure that electrical lines have no load.
6.3. Appropriate switchgears should be used for making or breaking electrical lines or circuits to electrical equipment.
After turning switchgears to the off position, the worker must:
7.1. Lock the actuator, control circuit and interlock of each switchgear.
7.2. Put up the safety sign.
7.3. Assign a lookout (where necessary).
8.1. It is obligatory to dump residual charges (where necessary) and install portable earths before performing works.
8.2. The procedure for dumping residual charges must be carried out in the normal operating state by using occupational safety and health equipment.
9. Checking that there is no electricity
9.1. When performing the de-energized work, it is mandatory to check to confirm that the worksite is completely de-energized.
9.2. In case a de-energized circuit lying near or passing over or under a live high-voltage circuit, induced voltage must be checked with a voltage tester. When induced voltage is detected, the contractor’s staff must report to the direct supervisor. The direct supervisor must give additional safety precautions and/or appropriate instructions to ensure the safety of the contractor’s staff, such as carrying out the earthing procedure and prohibiting the work from being carried out until these additional safety precautions have been taken.
10. Protecting against backfeeding
10.1. A portable earth must be installed to prevent the reverse current flow to the worksite from the secondary side of the transformer or other low-voltage supplies.
10.2. When cutting off electricity in low-voltage lines, measures must be taken to prevent electrical backflow to lines from other standalone power supplies.
11. Several regulations on installation and disconnection of portable earths at worksites
11.1. The contractor shall install and disconnect a portable earth according to the direct supervisor’s instructions.
11.2. Once multiple contractors perform the works related directly to each other, each of them must install a separate portable earth.
11.3. A contractor can temporarily disconnect a portable earth to serve the purpose of carrying out their necessary works by order of the direct supervisor, and must reconnect the earth immediately after completion of such works.
11.4. When installing and disconnecting a portable earth on the high-voltage grid, the contractor’s staff must use suitable insulating poles and gloves; when installing and disconnecting a portable earth on the low-voltage grid, they must wear low-voltage insulating gloves.
11.5. Earth wires must be made of copper or other soft alloys, be composed of multiple strands, and have the cross-sectional areas that withstand the effect of electromotive force and heat.
11.6. When installing a portable earth, an end driven into the ground is installed first and the other end attached to the conductive part is installed later. Meanwhile, a portable earth can be disconnected in reverse order.
12.1. When working on an electricity facility project executed by different contractors, each contractor shall be required to take separate safety engineering precautions.
12.2. There must be identification signs that help distinguish contractors’ staff according to their scope of activities.
II.II. Working near energized parts
13.1. When there is no temporary barrier, the electrical safety distance shall not be less than the values specified in the following table:
|
Voltage level (kV) |
Electric safety distance (m) |
|
From 01 to 15 |
0.70 |
|
From greater than 15 to 35 |
1.00 |
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From greater than 35 to 110 |
1.50 |
|
220 |
2.50 |
|
500 |
4.50 |
13.2. When there is a temporary barrier, the safety distance from that barrier to the energized part shall not be less than the values specified in the following table:
|
Voltage level (kV) |
Electric safety distance (m) |
|
From 01 to 15 |
0.35 |
|
From greater than 15 to 35 |
0.60 |
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From greater than 35 to 110 |
1.50 |
|
220 |
2.50 |
|
500 |
4.50 |
13.3. When failing to meet the electric safety distance specified in 13.1, or being unable to build a barrier defined in 13.2, power cut is required before performing a work.
14. Requirements of temporary barriers
14.1. Installation of a temporary barrier shall be decided prior to commencement of a work.
14.2. Requirements of a temporary barrier:
14.2.1. It is made of solid materials.
14.2.2. It is not inclined towards energized parts.
14.2.3. The distance requirement of a barrier set out in 13.2 herein must be satisfied.
14.2.4. In case of any accident, incident or emergency that takes place, it shall not hinder workers and staff inside from getting out.
15. Designation as a safe work zone
Before working near an energized part, the operator shall be responsible for providing space for the contractor to work as follows:
15.1. Requirements for establishment of a safe work zone:
15.1.1. Energized parts near that safe work zone are not interrupted.
15.1.2. In case of any accident, incident or emergency that occurs, the contractor's evacuation is not hindered or encumbered.
15.2. The operator and the contractor cooperate in defining boundaries of a safe work zone.
15.3. A temporary barrier is installed or proper measures are applied in order to enable the contractor to visually pinpoint the boundaries of a safe work zone.
15.4. Handover of a safe work zone is required.
16. Taking over and working inside safe work zones
16.1. From the time of takeover of a safe work zone, the direct supervisor and the permission giver have a duty to check it over.
16.2. While at work, the contractor shall be prohibited from:
16.2.1. crossing the boundaries of the safe work zone that the operator has designated and handed over to the contractor.
16.2.2. transposing or removing barriers, signs and signals used for identifying the safe work zone and safety precautions that the operator has set up.
In dangerous areas and areas where electrical devices are installed, appropriate barriers, signs and signals must be placed to warn of danger.
18. Outdoor electrical equipment
For outdoor high-voltage electrical equipment, the following safety precautions must be taken to prevent unauthorized persons from entering the restricted area:
18.1. Safety perimeters, barriers, enclosures or other precautions.
18.2. “No entry” signs or signals placed at entrance or exit ways.
18.3. Door locks or other security measures set in place at entrance or exit doors.
19. Indoor electrical equipment
For indoor high-voltage electrical equipment, appropriate measures must be taken to prevent unauthorized persons from coming near such equipment.
20. Lighting for working locations
Proper illumination defined in applicable regulations shall be maintained at the place of work.
Contractors shall put up safety warning signals in dangerous areas during the working period to ensure the safety for their staff and community.
II.III. Working with energized parts
22. Preconditions for working live
22.1. To work live, the competent authority’s consent should be obtained.
22.2. People carrying out energized works must be trained and drilled to become fitted to use the given devices, processes and technologies.
22.3. Work plans and safety precautions must be approved before use.
22.4. Procedures for carrying out works shall be designed according to applied technologies.
23. Safety conditions for working live
23.1. When working with energized parts, safety equipment, tools or means must be available for use.
23.2. It is obligatory to check that metal structures in the worksite that workers may contact must be de-energized.
23.3. When working on or near energized parts, the contractor’s staff is not allowed to wear any jewelry or carry metal personal items.
23.4. When working live, the contractor’s staff must identify the nearest live part from their working location.
24. Safety precautions for working with low voltage
Requirements applied to the contractor’s staff:
24.1. Proper safety equipment, tools or means must be used for works.
24.2. Cover energized parts to get rid of risks likely to cause danger (if necessary).
25. Safety precautions for working with high voltage
25.1. When working with high voltage, i.e. inspecting, repairing and cleaning live parts or insulators (or other insulating materials), the contractor’s staff must use equipment and tools designed to work live, in which case the minimum permissible distances between them and other surrounding live parts (if not insulated) must correspond to the working voltage levels of circuits specified in the following table:
|
Grid voltage level (kV) |
Minimum permissible distance (m) |
|
From 01 to 35 |
0.6 |
|
From greater than 35 to 110 |
1.0 |
|
220 |
2.0 |
|
500 |
4.0 |
25.2. When transposing metal tools or components to utility poles, it is obligatory to ensure that they do not come close to conductors within the distance specified in 25.1.
When working with a grid with voltage up to 35 kV where the distance between the conductor and the utility pole is smaller than that specified in 25.1, working at the pole body with protective shields made of insulating materials is allowed.
27. Reinforcement prior to working live
Repair of an electrical line without power cut is allowed only when the solidity and durability of the conductor and utility pole are completely trusted. Where it is discovered that the utility pole is unsafe, it must be reinforced before performing the work.
28.1. When standing on insulating equipment having equipotential connection to the conductor, any contact with the end of insulator or other part whose voltage is different from that of the conductor is prohibited.
28.2. While standing on insulating equipment having equipotential connection to the conductor, exchange of anything that could cause loss of equipotential is prohibited.
28.3. A worker’s motions on insulating equipment are prohibited after he/she has had equipotential connection to the conductor. Entry or exit of the contractor’s staff into/from the working part of insulating equipment is allowed only after he/she is at the minimum distance specified in the table below from the conductor, and only after his/her equipotential connection to the conductor has lost.
|
Voltage level (kV) |
Minimum distance (m) |
|
Up to 110 |
0.5 |
|
220 |
1.0 |
|
500 |
2.5 |
29. Powers and responsibilities of operators
29.1. Safely manage and operate electricity facilities in accordance with regulations in force.
29.2. Authorize contractors to enter the worksite.
29.3. Check, monitor and detect unsafe situations to take timely actions.
29.4. Suspend the contractor’s work if continuation in such work causes safety risks.
30. Organization of a contractor
30.1. A contractor must be composed of at least two persons, including a direct supervisor who assumes overall responsibility, except for the works specified in 30.3.
30.2. The contractor’s staff may come from different organizations provided that an organization or individual bears main responsibility, and an agreement between the parties involved is made.
30.3. Simple works requiring no safety precaution are allowed to be performed by the single-person contractor.
31. Designating a direct supervisor and the contractor’s staff
Entities and persons shall be responsible for designating the direct supervisor and the contractor’s staff suitable for the works, having professional qualifications and competencies in performing the works in a safe manner.
32. Designating an electric safety superintendent
32.1. The operator shall be responsible for designating the electric safety superintendent when the contractor does not have expertise in electricity or lacks professional qualification in electric safety.
32.2. The contractor shall be responsible for designating the electric safety superintendent who supervises the works involving extreme electric dangers (e.g. hotline repairs).
32.3. In other cases, the contractor may negotiate with the operator about designation of the electric safety superintendent.
When a work is performed by multiple contractors under the same entity, designating a work director shall be mandatory.
34. Works requiring worksite surveys
34.1. Worksite surveys shall be applied to the works, including but not limited to the following:
34.1.1. Works performed according to plans.
34.1.2. Works performed at the sites that involve dangerous elements, which may cause accidents to persons participating in the works, or to the community.
34.2. For the works not mentioned in 34.1, the operator/contractor can decide whether a site survey is conducted.
35. Worksite survey responsibilities, questions and findings
Contractors shall be responsible for leading and cooperating with operators in conducting worksite surveys.
III.IV. Designing electric safety precautions in work plans
36. Works requiring electric safety precautions in work plans
They are the works requiring worksite surveys as defined in Article 34 herein.
37. Responsibilities for designing electric safety precautions in work plans
Contractors shall take responsibility for leading and cooperating with operators on design of electric safety precautions in work plans.
38. Main contents of electric safety precautions in a work plan
Main content of electric safety precautions in a work plan includes (but not limited to) the following:
38.1. Name of the work.
38.2. Permitted area of work.
38.3. Hazards at the worksite, measures to prevent and ensure safety for participants in works and the community at the worksite; In case it takes a lot of days to perform the work, the parties concerned shall reach an agreement on this.
38.4. Personnel arrangement.
38.5. Responsibilities of the operator and the contractor to perform works on schedule and ensure safety.
39. Approving and revising or updating electric safety precautions included sin work plans
39.1. Electric safety precautions included in a work plan must be approved by the operator before commencement.
39.2. Revising and updating electric safety precautions in a work plan (without changing the main content) must be agreed upon and notified to the relevant units by both parties.
40. Planning and registering works
40.1. The contractor cooperates with relevant units (the operator or other contractor) on formulation of a work plan corresponding to the work content and sequence.
40.2. The contractor is obliged to register a work plan with the operator in accordance with regulations in force.
40.3. The operator registers power cut in accordance with regulations in force, and notifies this to the contractor.
41. Cancelling or rescheduling works due to weather-related issues
41.1. In the event of heavy rain, strong wind, lightning, thunder or dense fog, the works carried out by using outdoor equipment may be canceled or rescheduled, depending on the specific situation.
41.2. In case of rain, fog or inundation, all outdoor works are prohibited.
III.VI. Work requests or orders
42.1. A work request is a permit document that allows works with electrical equipment and lines.
42.2. When working according to a work request, each contractor must be granted an approved work request to a type of work.
42.3. Each work request may exist in the physical or electronic form.
A work order is a physical, electronic or oral order for execution of works with electrical equipment or lines. Before commencement of a work, an order needs to be certified by parties involved, and the content of each order is deposited.
44. Other regulations for work requests or orders
44.1. The validity period of a work request or order ranges from the day on which the direct supervisor receives it and agrees on the content of that work request or order with the permission giver to the day on which the direct supervisor signs to certify completion of the work; each work request or order must be kept at least 15 days from the date of completion of the work.
44.2. In case of an accident that occurs, a work request or order, together with the case file, must be kept.
44.3. When working on an electrical line or equipment that has been de-energized continuously for a multi-day work, a work request needs to be issued to allow that multi-day work to be performed before each working day. In this case, the contractor must follow permission-giving procedures for the work.
45. Works requiring work requests or orders as a precondition
45.1. Work requests are required as a precondition for application of safety engineering precautions in preparation for worksites for such works as:
45.1.1. Working dead.
45.1.2. Working near live or energized parts.
45.1.3. Working live.
45.2. Working according to work orders, including:
45.2.1. Works not requiring implementation of safety engineering precautions for preparation of worksites.
45.2.2. Works performed at a distance from energized zones.
45.2.3. Works to be performed as response to any accident under the superintendence of an in-charge shift worker.
45.2.4. Works with low voltage under a unit head’s decision.
A work request shall include, but not limited to, the following main information:
46.1. Reference number of the work request.
46.2. Full name of the issuer of the work request.
46.3. Full name of the work director (if any).
46.4. Full name of the electric safety superintendent (if any).
46.5. Full name of the permission giver.
46.6. Full name of the direct supervisor.
46.7. List of the contractor’s staff members.
46.8. Work items or activities.
46.9 Work location.
46.10. Working time (including working hour, day, month and year).
46.11. Preconditions for commencement of the work (i.e. deciding whether electricity is off; working near energized parts).
46.12. Scope of activities.
46.13. Safety precautions to be taken at the worksite.
46.14. Instructions or cautions issued by the permission giver to the contractor.
46.15. Other necessary work items (if any).
46.16. Completion and termination of the work, and return of the worksite.
46.17. Invalidation of the work request.
The work request form is given in Appendix A.
47. Main content of a work order
47.1. Reference number of the work order.
47.2. Full name of the work order issuer.
47.3. Full name of the direct supervisor (the work order assignee).
47.4. List of the contractor’s staff members.
47.5. Work items or activities.
47.6 Work location.
47.7. Working time (including working hour, day, month and year).
47.8. Preconditions for commencement of the work.
47.9. Completion of the work.
The work order form is given in Appendix B.
48. Responsibilities of the work request/order issuer
48.1. Complete and sign in the form before it is handed out.
48.2. Hand out the completed form, and provide instructions about specific requirements and hazards for commencement of the work.
48.3. Check and sign to certify the expiration of the work request/order when it is handed back.
49. Responsibilities of the work director
Cooperate in the contractor's operations during the period of performance of works.
50. Responsibilities of the permission giver
50.1. Inspect whether electric safety engineering precautions have been fully implemented to prepare worksites for contractors within their range of responsibilities.
50.2. Show the contractor equipment that has been de-energized, the parts of the equipment that are still live, and safety precautions that need special attention.
50.3. Sign to authorize the contractor to enter the worksite, and hand a safe worksite over to the contractor.
51. Responsibilities of the electric safety superintendent
51.1. Join with the direct supervisor in taking over the worksite.
51.2. Work full-time at the worksite to supervise electric safety for the contractor's staff without being allowed to undertake any other part-time job.
52. Responsibilities of the direct supervisor.
52.1. Collaborative responsibilities
Work closely with related organizations, command and inspect the contractor to ensure safety at work and maintain safety for community.
52.2. The direct supervisor must clearly understand the content of the assigned work and the safety precautions appropriate to the work, and must:
52.2.1. conduct the preliminary inspection of health condition of the contractor’s staff and essential first aid kits.
52.2.2. conduct the re-inspection and inspection of full implementation of necessary safety precautions.
52.2.3. conduct the inspection of compliance with safety regulations of the contractor’s staff.
52.2.4. conduct the inspection of quality of safety tools and equipment used at work.
52.2.5. Directly, or assign the contractor’s staff to, place, move or dismantle electrical safety signs, barriers or portable earths when they are at work, and notify these activities to all staff members of the contractor.
52.3. Responsibilities for assignment of duties
Assign the contractor’s staff to enter the worksite only after obtaining approval from the permission giver, and examining and taking necessary safety precautions.
52.4. Explanatory responsibilities
Before authorizing the contractor to enter the worksite, the direct supervisor must explain to the contractor’s staff the scope of activities involved in the work and steps in performing the work, as well as safety precautions.
52.5. Supervisory responsibilities
The direct supervisor must be always present at the worksite, supervise and take measures to prevent the contractor’s staff from committing any act that may cause an accident at work.
52.6. Responsibilities for taking over and returning the worksite
Sign to check with the permission giver whether the worksite is taken over or returned.
53. Responsibilities of the contractor’s staff
53.1. Thoroughly grasp and fully comply with work-related safety regulations; identify hazards and become proficient in applying first aid methods to victims of electrical accidents.
53.2. Follow the instructions of the direct supervisor, and avoid performing the works without the authorization of the direct supervisor.
When being unable to perform the work ordered by the direct supervisor, or perceiving that performance of the ordered work is dangerous and unsafe, the contractor’s staff may immediately stop the work and report to the person in charge.
53.3. Perform the authorized works only.
53.4. When an accident occurs, all staff members of the contractor must seek to offer victims first aid and medical emergency care, and immediately notify the nearest medical facility.
54. Responsibilities of the work order assignee
54.1. Become well aware of the time, place and details of the assigned work, and safety precautions appropriate to the requirements of that work.
54.2. Carefully read the content of the work order. If such order is not normal or clear, they must immediately check it with the order issuer again.
54.3. Prepare and check the quality of safety tools and equipment while they are used to perform the work.
54.4. Inspect and implement safety precautions before commencement of the work.
55. Responsibilities of the lookout
55.1. Join with the direct supervisor in taking over the watched position, and always be present at the watched position to ensure safety for the community.
55.2. Cooperate with the direct supervisor to ensure the work is performed in a way that protects safety for the community.
56. Confirming safety precautions before commencement of the work
Before carrying out the work, the direct supervisor is required to confirm safety engineering precautions at worksite that have been prepared in a due and sufficient manner.
Before each work, the contractor’s staff must examine occupational safety and protective equipment, instruments and machinery.
58. Requirements applied to temporary suspension of the work
In case of temporary suspension of the work, safety precautions that have been applied, such as portable earths, barriers, warning signs, must be continued without interruption during the period of such temporary suspension. If no one stays at the worksite at night, the contractor must take appropriate measures to prevent the possibility that an accident is likely to occur. Before resuming the work, all safety precautions must be re-checked to ensure that they remain appropriate and sufficient.
59. Responses to abnormalities of equipment
59.1. When detecting any damage to equipment that is potentially dangerous to human life, the contractor’s staff must immediately report it to the person in charge after applying urgent measures to avoid causing any risk to human life.
59.2. Upon receipt of a report of damage to equipment potentially hazardous to human life, the person in charge must immediately take appropriate action.
59.3. If there is a risk of electric surge or shock, cutting off electricity immediately shall be required. In case the power cannot be cut off, appropriate measures, such as assigning a lookout, must be taken to avoid any accident to human life.
60. Actions to be taken in case of an accident or incident
If an accident or incident occurs, the direct supervisor and the contractor’s staff must immediately stop working and comply with the following principles:
60.1. Appropriate measures should be taken to prevent further hazards, and any approach to the damaged equipment that is likely to cause danger shall be prohibited.
60.2. Victims involved in such accident or incident must be given first aid care, and the immediate contact with the nearest health facility must be needed.
60.3. Relevant entities must be promptly notified in case of an accident that takes place.
61. Terminating and temporarily suspending the work
61.1. The contractor shall be required to interrupt the work:
61.1.1. during the break time.
61.1.2. when any weather change causes risks to safe working.
61.1.3. when any sign of hazard appears at the worksite.
61.1.4. when the direct supervisor or the electric safety superintendent or the lookout fails to fulfill their duties, or is forced to leave the worksite without their substitute.
61.1.5. when any accident or incident related to the worksite occurs.
61.2. Requirements for resumption of the work
Before resuming the work, the direct supervisor shall re-examine the worksite, and allow the contractor to continue to perform the work if safety precautions have functioned.
61.3. If the decision to terminate the work is issued, work termination procedures must be carried out.
62. Substituting the contractor’s staff
Substitution of a staff member or the number of staff members of the contractor shall be decided by the contractor’s person in charge after receiving the permission giver’s consent sought by the direct supervisor.
The direct supervisor shall be required to follow the steps hereunder:
63.1. Directly re-examine the completed work, the packing up of tools, and the cleaning up of the worksite.
63.2. Order the contractor’s staff to withdraw from their working positions, except for those who are in charge of dismantling safety precautions.
63.3. Order the dismantling of safety precautions that the contractor takes before commencement of the work.
63.4. Check whether workers, tools, materials and safety equipment have been fully counted up.
63.5. The contractor’s staff is prohibited from returning the worksite.
The contractor can hand over the worksite to the operator only when all the works have been completed, and portable earths that the contractor installs have been disconnected.
After completing the steps specified in Article 63, the direct supervisor shall enter and sign in the section “completion of works” in the work request, and hand over the worksite to the permission giver.
65. Resting at the end of the working day and starting the next working day
65.1. If it takes days to perform a work, after each working day, the contractor shall be required to clean up the worksite and ensure that safety precautions remain in position.
65.2. When starting the work in the following day, the permission giver and the direct supervisor need to re-check safety precautions, and carry out the procedures for grant of permission to work.
65.3. Till the next working day, the direct supervisor may authorize the contractor's staff to enter the worksite only after receiving the permission giver's consent, and must re-check whether safety precautions remain appropriate and sufficient according to the requirements of the work.
IV. REGULATIONS APPLIED TO SPECIFIC TYPES OF WORK
IV.I. Occupational safety and health protection equipment (OSH equipment)
66. Requirements for use of such equipment
66.1. All of the contractor’s staff must properly and fully use occupational safety and health protection equipment suitable for the assigned work. The direct supervisor shall check whether the contractor’s staff uses OSH equipment at work.
66.2. When working near the line with voltage of 220 kV or more, and facing the possible risk of electric shock due to inductive electrification, the contractor’s staff must be furnished with dedicated protective equipment.
67.1. Electric safety tools and equipment must meet testing and usage standards.
67.2. OSH equipment needs to be tested, trialed and stored according to in-house specifications of the manufacturer and regulations of laws in force.
68.1. Before use, users should inspect and use OSH equipment only when they are satisfied that such equipment satisfies the given requirements.
68.2. After use, OSH equipment needs to be cleaned, dried and stored according to regulations in force. If there is any sign indicating the abnormal condition of OSH equipment, a report on this should be sent to the supervisor.
69. Using tools and equipment when working live
Performing all energized repair works without using OSH equipment shall be prohibited.
70.1. Tools and equipment needed for energized repair works must be periodically inspected according to standards, and maintained and stored according to regulations in force.
70.2. Use of OSH tools and equipment for energized repair works of which the time limit for inspection is exceeded; which is expired; or which show any abnormal sign shall be prohibited.
71. Transporting OSH tools and equipment
OSH tools and equipment should be stored in specialized packages to protect against damage, deformation, fuel, dirt and moisture penetration during transportation.
IV.II. Ensuring safety during construction of electricity facilities
72. Performing pole footing and utility trench excavation works
72.1. When digging a pole footing or utility trench, the contractor must apply appropriate measures to prevent landslides.
72.2. The contractor must take appropriate measures to prevent people from falling into a pit, such as setting up barriers, warning lights and assigning lookouts when necessary.
72.3. Before digging a foundation pit, the contractor must check whether there is any underground work under or near the excavation site, and take appropriate measures to avoid accidents or damage to that work. If any unexpected underground work or damaged underground work is discovered, the contractor must stop working and reporting the situation to the person in charge. In case an underground work that is damaged cause an accident, the contractor must apply appropriate measures to prevent future accidents, and immediately notify relevant organizations.
73. Distance requirements for excavation works
73.1. When performing excavation work, construction equipment, such as vehicles, excavators, etc., must be at least 01 (one) meter from the electric cable line; vibrator-mounted excavators must be at least 05 (five) meters from the cable line.
73.2. When performing excavation work right above the underground electric cable line, the first thing to do is to excavate a trial pit to investigate the position and depth of that underground electric cable under the supervision of the equipment operator. From the depth of 0.40 meter above the underground cable line, a handheld shovel must be used for further excavation.
74. Erecting and dismantling utility poles
74.1. It is forbidden to place hoisting or lifting equipment to erect a utility pole right under the conductor for the high-voltage transmission line in use.
74.2. Hoisting cable and decelerating cable must be fitted properly to prevent the slipped or broken cable from being thrown towards the operative line. The minimum permissible distance from the hoisting and decelerating cable to the live line is as follows:
|
Voltage level (kV) |
Minimum permissible distance (m) |
|
Up to 220 |
6.0 |
|
500 |
8.0 |
74.3. Only a rope may be used as a guy wire to pull the utility pole in the direction of the operative line. The minimum permissible distance from a guy rope to the live conductor is as follows:
|
Voltage level (kV) |
Minimum permissible distance (m) |
|
Up to 35 |
4.0 |
|
Up to 220 |
6.0 |
|
500 |
8.0 |
At the risk of transposing a guy wire towards the live conductor at a distance less than that specified in the table above (because the wire is broken; the mooring line is not fixed in position, etc.), another counterbalancing guy wire should be used to pull the utility pole in the opposite direction.
74.4. When standing up a utility pole, the following components should be grounded:
74.4.1. Body of the lifting staywire winch.
74.4.2. All guys should be made of metal if it is an iron utility pole to be erected.
74.5. Necessary measures should be applied to pole erection or dismantling activities in order to prevent leaning or collapse.
74.6. When erecting and dismantling a utility pole near an electrical line, appropriate measures must be taken to prevent any accident caused by encroaching the safety distance corresponding to the voltage level of the line.
IV.III. Safety for working with electrical lines
75. Working near high-voltage lines
75.1. The contractor’s staff should be furnished with and use suitable OSH equipment.
75.2. The contractor’s staff is required to work at a safety distance from the live line. Safety distances corresponding to voltage levels shall be defined as follows:
|
Grid voltage level (kV) |
Minimum permissible distance (m) |
|
From 01 to 35 |
0.6 |
|
From greater than 35 to 66 |
0.8 |
|
From greater than 66 to 110 |
1.0 |
|
From greater than 110 to 220 |
2.0 |
|
From greater than 220 to 500 |
4.0 |
75.3. In case of failure to meet the distance requirements specified in 75.2, electricity must be switched off.
76. Working with low-voltage lines
76.1. If there is a risk of electric shock to the contractor’s staff due to other low voltage lines, the direct supervisor must request the contractor’s staff to cover the live parts with protective devices to protect against hazards.
76.2. The contractor’s staff must use appropriate protective clothing and equipment when covering live parts.
77. Replacing or stretching electrical lines
77.1. For a repair work that, when performed, is likely to cause the conductor line that needs repairing to be downed or droop, if that line suspended between the opposite poles passes under another live conductor line, de-energization of these lines is not required.
77.2. When replacing a conductor line passing under another line, the contractor should take proper measures to prevent the replaced line from leaping up onto the above live line.
78. Working with lightning arrester wires
When working with a lightning arrester wire on a utility pole located within the affected zone of live lines, a shortcut connector between the lightning arrester wire and the body of the intended iron pole, or the ground wire for the intended concrete or wooden pole must be placed to eliminate induced voltage. When working with a conductor, in order to protect the contractor’s staff from hazards caused by induced voltage, it is necessary to connect the portable earth of the conductor with the beam of the iron pole, or set the ground wire for the wooden or concrete pole at the worksite.
79.1. The minimum permissible distance from the (decelerating or hoisting) steel cable and the steel guy wire to the conductor of the live line is specified as follows:
|
Working voltage (kV) |
Minimum permissible distance (m) |
|
From 01 to 35 |
2.5 |
|
From greater than 35 to 110 |
3.0 |
|
From greater than 110 to 220 |
4.0 |
|
From greater than 220 to 500 |
6.0 |
79.2. If a guy wire is likely to move near the live conductor at a distance less than those specified in 79.1, a mooring line shall be used to pull the guy wire sufficiently away from the conductor. (Pulling) steel cables must be installed so that, if broken, they will not be thrown towards the live line.
80. Working on a de-energized line carried on the same pole as a live line
80.1. Works that involve climbing up a pole carrying a de-energized circuit of a multi-circuit line while the other circuit is still live are only allowed provided that the distance between the two nearest conductors of those two circuits is not less than the distance specified as follows:
|
Working voltage (kV) |
Minimum permissible distance (m) |
|
From 01 to 35 |
3.0 |
|
66 |
3.5 |
|
110 |
4.0 |
|
220 |
6.0 |
|
500 |
8.5 |
80.2. For a 35 kV line, when the distance between the two nearest conductors of the two circuits is between 02 m and less than 03 m, climbing up a pole carrying a de-energized circuit while the other circuit is still live (except for mounting lightning arrester wires) is allowed as long as safety precautions have been taken.
80.3. Working on conductors of two circuits when a circuit is still live in case of strong winds that can sway the ropes and cables, and make it difficult for people working on the pole, shall be prohibited.
When mounting or removing electrical conductors, the following requirements must be fulfilled:
81.1. Check the normal working condition of supporting structures and guide cables, and take additional measures to prevent falling and collapse.
81.2. Community safety measures, such as placing danger warning signals, setting up barricade tapes or barriers for danger restricted areas, and arranging lookouts when necessary, should be applied.
IV.IV. Safety for working at power plants or stations
82.1. When closing or cutting off the circuit energizing equipment, appropriate safety equipment should be used.
82.2. Power cut for works shall be carried out to ensure that, after being de-energized, the intended part of the equipment is seen as isolated from the live parts from all sides (except for GIS equipment).
83. Working with generators or transformer stations
83.1. When working on equipment in stop mode, such as generators, synchronous compensators and transformers, disconnecting all switching devices from electrical lines and equipment in order to prevent unexpected power surges occurring on the equipment side is mandatory.
83.2. Generator tests are allowed when that generator is rotating without excitation, and these tests are conducted according to the approved test procedures.
84.1. If there are flammable and explosive substances, e.g. gasoline, oil, gas, hydrogen, acetylene, at or near a work zone, the operator and the contractor must cooperate on implementation of suitable fire safety measures.
84.2. When a generator or synchronous compensator operates with a hydrogen cooling system, formation of combustible and explosive mixtures of hydrogen gas shall not be allowed. These mixtures are prone to explosions when hydrogen gas accounts for 3.3% to 81.5% of the air.
84.3. When operating electrolysis equipment, formation of explosive mixtures of Hydrogen and Oxygen shall be prohibited. These mixtures are prone to explosions when hydrogen and oxygen account for 2.63% to 95% of the air.
84.4. When performing the repair work in the choke oil and air system of a generator, hydrogen-cooled compensator, or electrolyzer in stop mode, fire and explosion prevention measures, such as ventilating the air system, the work zone, or separating the system from the running systems, must be applied.
84.5. Works involving fire or producing sparks in direct contact with the casing of a generator, compensator, electrolyzer, or on the pipeline of an oil and gas system containing hydrogen.
84.6. Works involving fire, such as electric welding, oxy-fuel welding... at a distance of more than 15 m from an oil and gas system containing Hydrogen can be performed. If less than 15 m, special safety measures, such as placing a screen, and checking to ensure that hydrogen does not exist in the air at worksite,... should be taken.
84.7. Works involving fire inside the electrolysis equipment room can be carried out when such equipment is stopped; when the analysis shows no hydrogen in the air; and when the ventilation system is in continuous operation. When needing to perform works involving fire on machinery of another electrolysis equipment which is in unstoppable operation, in addition to the above safety measures, all pipes connecting the worked equipment in operation and the repairing equipment must be disconnected and blocked. Sites of works involving fire must be shielded to prevent sparks from flying off to the surrounding area.
85. Working with electric motors
85.1. When working on an electric motor without needing to disconnect it from the electric circuit, the actuator and the power source for the motor control must be locked, and a sign must be set up to prevent mistaken re-energization.
85.2. When working on a motor that requires disconnection of poles from a power supply circuit, a 3-phase short circuit current must be connected, and portable earthing must be set for three power supply poles on the power supply side.
85.3. Motor outlets and cable hoppers must be protected by guards and secured with bolts. Removing these guards while the motor is running is prohibited. Rotating parts of the motor, such as slip ring, flywheel, shaft coupling, and blower, must be guarded.
85.4. Before starting work on a pump or blower motor, reverse rotation measures should be taken.
86.1. Before working with switchgear that can be automatically started and remotely controlled, the following measures should be taken:
86.1.1. Separate the circuit for control power supply.
86.1.2. Put up the safety sign.
86.2. To conduct a circuit switching test for calibration of switchgear, temporarily closing the current in the operation circuit, the power circuit of the actuator or the signal circuit without having to carry out the handover procedures is allowed. After completion of the test, if it is necessary to continue working at that switchgear, the equipment operator or the direct supervisor (when agreed by the equipment operator) shall take the necessary engineering precautions before allowing the contractor to enter the worksite.
86.3. During operation, all switching actions must be controlled remotely. Pressing the call-to-action button right at the control box of the circuit breaker is prohibited. Switching off the circuit breaker by pressing this call-to-action button is allowed in case of needing to prevent incidents or rescue victims of electric accidents.
86.4. Switching off the circuit breaker by pressing the on-site call-to-action button is prohibited if the circuit breaker is not switched off, or all terminals have not been completely turned off, in spite of being remotely shut down.
86.5. Dumping of insulating substances used for operation of switchgears in the environment is prohibited.
87. Raising or lowering electrical equipment
When raising, lowering or dismantling electrical equipment, appropriate measures must be taken to prevent falling, collision or accident due to encroachment of the safety distance between the equipment and the electrical conductors or other electrical equipment.
When working with a protective measuring circuit, the contractor’s staff must be careful not to impede the grounding part on the secondary side of the voltage and current transformer. In particular, open circuit condition in a current transformer on the secondary side is not allowed.
89. Working with battery systems with dielectric liquids
89.1. A neutralizer suitable for the battery system must be made ready for use.
89.2. When working with acids and alkalis, appropriate measures, such as wearing dedicated clothing, eye protection glasses and rubber gloves, should be taken to protect the body from the effects of acids and alkalis.
89.3. Do not smoke or bring fire into the battery room. Outside the door of the battery room, a "Battery room - no fire - no smoking" sign must be mounted.
89.4. The battery room must be well-ventilated to prevent poisoning or fire due to gases emitted from the battery system.
90. Safe working with GIS equipment
90.1. During normal operation, all actions must be performed by remote control via the human-machine interface (HMI), or the supervisory control and data acquisition (SCADA) system. Local control is allowed only when the gas insulated switchgear (GIS) is not energized.
90.2. SF6 gas pressure, and SF6 leak condition during operation or repair, must be checked. When a leak is detected, measures must be taken to prevent and deal with it.
90.3. When isolating equipment by stages, at each isolation point, lockout and mounting of a warning sign are required.
90.4. Determining whether or not a GIS has been isolated is based on the on-site command over operation of the switchgear and voltage parameters of the GIS.
IV.V. Safety for working at height
91. Checking before climbing up supporting frameworks
91.1. Before climbing on a supporting platform, framework or pole, the contractor’s staff must visually check:
91.1.1. Condition of that supporting platform, framework or pole.
91.1.2. Position of that supporting framework and ways to climb up safely; configuration of that pole or conductors mounted on that pole.
91.1.3. whether necessary OSH equipment are ready for use.
91.2. Where it is necessary to climb up a pole that is not stable enough, appropriate reinforcement measures must be taken to ensure safety before performing the work.
91.3. The direct supervisor must issue an order to stop the work if detecting signs of threats to the safety of people and equipment.
92. Checking power cut and leakage
When climbing up a utility pole, the contractor’s staff must check whether power is off or leaked.
When working at a height or depth of more than 02 m from the ground, the contractor’s staff must use appropriate means of ascending and descending.
When working at height, the contractor’s staff must use safety belts. The safety belt must anchor (hook) to a fixed and secure position.
95. Preventing materials and tools from falling
When using materials and tools at height, and when ascending/descending tools and materials, the worker must take appropriate measures to prevent them from dropping down.
IV.VI. Safety for inspection of electrical equipment and tools
96. Barriers, safety distances and earthing
96.1. High voltage zones inside test stations or laboratories should be isolated by barriers.
96.2. The distance from the conductive part of the test equipment to the earthed fixed barrier shall not be less than the distance specified in the following tables:
96.2.1. For impulse voltage (amplitude value)
|
Voltage level (kV) |
Distance (m) |
|
From 01 to 100 |
0.5 |
|
From greater than 100 to 150 |
0.75 |
|
From greater than 150 to 400 |
1.0 |
|
From greater than 400 to 500 |
1.5 |
|
From greater than 500 to 1000 |
2.5 |
|
From greater than 1000 to 1500 |
4.0 |
|
From greater than 1500 to 2000 |
5.0 |
|
From greater than 2000 to 2500 |
6.0 |
96.2.2. For power frequency voltage, r.m.s. voltage and d.c.:
|
Voltage level (kV) |
Distance (m) |
|
From 01 to 6 |
0.1 |
|
From greater than 6 to 10 |
0.2 |
|
From greater than 10 to 20 |
0.3 |
|
From greater than 20 to 50 |
0.5 |
|
From greater than 50 to 100 |
1.0 |
|
From greater than 100 to 250 |
1.5 |
|
From greater than 250 to 400 |
2.5 |
|
From greater than 400 to 800 |
4.0 |
The distance to the temporary barrier must be twice the above value.
96.3. The height of a fixed barrier must not be less than 1.7 m; the height of a temporary barrier must not be less than 1.2 m. The structure of the barrier must ensure that people cannot accidentally touch the live part.
96.4. The door of a barrier must open outwards or be of the side swinging type. The door must be automatically locked and can open from the inside of the barrier without a key.
96.5. It may not be necessary to lock the barrier at the test site located inside the test station in case of making sure that unauthorized persons cannot enter.
96.6. A fixed barrier shall be constructed so that the only way to dismantle it is to use a wrench or special tool. Getting inside the barrier to inspect the transformer is permitted only when the casing of the transformer is grounded, and the distance from the lowest shed of the transformer insulators to the nearest part of a human body is not less than the value specified in the following table:
|
Voltage level (kV) |
Distance (m) |
|
From 01 to 10 |
1.5 |
|
From greater than 10 to 35 |
2.0 |
|
From greater than 35 to 110 |
2.5 |
96.7. A transformer used for the insulation test requires a circuit breaker that automatically cuts off the power when the insulation is breached, and a resistor to reduce short-circuit currents.
96.8. A capacitor and instrument transformer used in the test scheme that are installed outside the test ground should be barricaded.
96.9. The following earthing actions are required: Frames, enclosures, bodies of objects to be tested and test equipment, portable test benches, handheld power tools, metal barriers, measuring instruments with metal casing must be earthed. If the metal casing of the measuring instrument cannot be grounded due to certain condition, a barrier shall be provided.
96.10. In the diagram of a function generator and a cascade DC generator, a device must be set in place to automatically ground all capacitors when the power is cut off from the rectifiers.
96.11. Equipment with large capacitance, if not included in the test scheme, but located in the test ground, shall be short-circuited and earthed.
96.12. When testing products with large capacitance, such as capacitors and cables, devices used for short-connecting and short-circuiting the tested products to earth must be in place.
96.13. At the end of the test, capacitors must be electrically discharged and earthed. When capacitors are connected in series, each capacitor must be electrically discharged. Electrical discharge must be discharged until all sparks are gone.
97. Periodic inspection of laboratory equipment and instruments
The operator of a test station or a laboratory must periodically inspect test equipment and instruments. Those which are measuring equipment must be inspected and calibrated in accordance with regulations in force. Equipment that fails to meet the requirements after inspection and calibration shall not be used.
98.1. Before starting a test, the test circuit to the test instruments must undergo the confirmatory check to ensure the accuracy of the test diagram.
98.2. Objects to be tested may be placed and removed only with approval from the direct supervisor.
98.3. Before connecting a circuit to the test diagram, it is necessary to check to prevent and isolate the sides of the transformer.
Before performing a discharge test, or other potentially hazardous tests or experiments, the test conductor should take the following measures:
99.1. Make sure no one is in the danger zone.
99.2. Make sure no unauthorized person is in the worksite.
99.3. Set up warning signals and lock fences to prevent unauthorized people from entering the test area.
100. Circuit-connected capacitors
100.1. The circuit supplying power to the terminal capacitor shall be provided with a switching device and have visible open points and be placed at the primary circuit of the test transformer.
100.2. Objects to be tested may be placed and removed only with approval from the direct supervisor, and after electricity is cut off from the circuit-connected capacitator.
101. Testing the mechanical strength of insulators
When testing the mechanical strength of insulators (made of porcelain, glass, synthetic resins...), people are not allowed to stand near the test site. Measures must be taken to protect the contractor’s staff from accidents caused by splashing out debris.
102. Precautions for test voltage
102.1. To prevent the test voltage from affecting the working voltage, the distance between the two parts with these voltage levels must be ensured as follows:
|
Rated voltage of equipment (kV) |
Up to |
|||
|
10 |
15 |
20 |
35 |
|
|
Minimum distance (m) |
0.15 |
0.20 |
0.25 |
0.50 |
102.2. When using a mobile test vehicle or a stationary testing machine, the following conditions shall be observed:
102.2.1. The test machine shall be divided into two distinct parts, including one part accommodating low-voltage equipment with space for the worker, and the other part accommodating all high-voltage equipment and conductors.
102.2.2. High-voltage electrical equipment must be carefully fenced to prevent people from approaching.
102.2.3. Doors of high-voltage electrical equipment must have interlocks using electrical contacts so that, when the door is opened, the high-voltage voltage is cut off, and there is an indicator light when this part of the equipment is energized.
102.2.4. All low-voltage electrical equipment must be arranged in such a way that it is convenient for operation and inspection.
IV.VII. Safety when working at locations that pose safety risks to the community
The contractor must take appropriate measures, such as placing barriers, if necessary, around the worksite so that unauthorized persons cannot enter to cause accidents and injure themselves. Especially, in the case of working with underground electric cables, the contractor must take measures to prevent people from falling down the pit.
The contractor must put up warning signs before working to ensure the safety of the community.
105.1. When using roads for works, such as construction and repair, the contractor can impose restrictions on the passage of vehicles and pedestrians to keep the community safe.
105.2. When restricting vehicles from using roads, regulations of relevant authorities must be strictly observed and the following requirements must be satisfied:
105.2.1. Set up warning signals and assign personnel as instructors to avoid danger to the community.
105.2.2. The width of the road for vehicles to pass through must conform to the regulations of the road management agency.
105.3. When restricting the traffic of pedestrians, to ensure safe travels, warning tapes, temporary barriers and specific instruction signs must be installed.
105.4. When the work is carried out near railway, road, waterway, or at the crossroads between the power lines and the aforementioned roads, the contractor must contact the relevant authorities and request these authorities to assign their staff to give assistance at work to ensure the safety of people and vehicles using roads, if necessary.
106.1. Only those who have been fully trained in professional skills and have relevant certificates as prescribed by law can operate special-use vehicles.
106.2. The vehicle operator must check the special-use vehicle before starting.
107. Regulations on speed limits
When driving in the power station area, the driving speed of a vehicle must not exceed 10km/h.
When driving in the power station area, the minimum distance from any part of the vehicle to the live part is not less than the distance specified in the following table:
|
Voltage level (kV) |
Distance (m) |
|
From 01 to 35 |
1.0 |
|
From greater than 35 to 110 |
1.5 |
|
220 |
2.5 |
|
500 |
4.5 |
When performing partially dead or live works near energized zones, platforms of cranes, ladder trucks and mobile forklifts must be grounded.
110. Responses to vehicle-related issues
110.1. In case of the electric discharge into a vehicle, people shall be prevented from touching, leaving or getting on the vehicle before the power supply causing such discharge is turned off.
110.2. If a vehicle catches on fire before power cut, the driver must jump out of the vehicle and move away to avoid step voltage.
Special-use vehicles must be checked periodically.
Operation of cranes, ladder trucks and forklifts shall not be allowed in case of scale-5 or higher-scale strong winds.
113. Procedures for operating vehicles
Each vehicle must follow operation and emergency response instruction procedures that are available for use at work. The vehicle user should apply safety regulations to their staff and the direct supervisor.
114. Vegetation near electricity facilities
114.1. Trees that are likely to threat electrical safety must be handled (i.e. cutting, pruning, moving,...). Organizations and individuals must cooperate with the operator on this before performing the work.
114.2. Before taking action, it is necessary to check and apply necessary measures to ensure safety for workers, electricity facilities and the community.
115. Working with electrical equipment and lines in shared-use technical infrastructure works
115.1. The intended electrical equipment or line must be identified correctly.
115.2. Hazards of shared technical infrastructure (if any) must be identified.
115.3. Safety for shared-use technical infrastructure works must be ensured.
116. Safety for lifting or lowering loads When lifting or lowering a load, the following principles must be observed:
116.1. The contractor’s staff should not stand and perform any work within the hazardous area of the lifting equipment.
116.2. The load carrying cable must have strength suitable for the load.
116.3. Hooks and pulleys withstanding cables and loads must be locked to prevent falling.
117. Transporting oversize or overweight items
When transporting oversize or overweight items, appropriate measures must be applied to ensure safety and compliance with regulations in force.
118. Preventing incapacitation as a consequence of working with vibrating tools
When working tools causing vibration, such as chainsaws, compactors, etc., appropriate safety measures must be applied.
For DC power transmission systems, underground substations, indoor substations in high-rise buildings, GIS stations, uninterruptable power supply units, wind power plants, and solar power plants, in the absence of current safety regulations of Vietnam on working with the foregoing, the manufacturers’ in-house specifications and international regulations shall prevail provided that they do not conflict with regulations of Vietnam.
120. Working with unwatched transformer stations
120.1. Measures must be in place to prevent unauthorized persons from entering transformer stations.
120.2. There is a process of operation management and cooperation among units.
120.3. Conditions for remote control and monitoring must be ensured according to current regulations.
120.4. When there is a contractor working at an unwatched transformer station, working with it must be the same as working with a watched one.
121. Live-line insulator cleaning
121.1. Water quality and pressure must ensure conformity to the cleaning process. Using water that does not meet insulation standards to clean hotline insulators shall be strictly prohibited.
121.2. The cleaning work is allowed only in normal weather condition. Performing the cleaning work when scale-4 or higher-scale wind; when there is drizzle, thunderstorm, thunder, fog or humidity that is not safe according to the given process shall be prohibited.
121.3. During the period of working, if there is a sign of rain or thunder, workers must stop working and withdraw from the worksite.
122. Working with live lines (hotline repairs)
122.1. For high-voltage lines (up to 35 kV):
122.1.1. The worker must be trained, tested and certified correspondingly.
122.1.2. Performing the work under such conditions as raining; wet, foggy weather; thunderstorm or scale-5 or higher-scale wind; in the dark or through lack of light shall be prohibited.
122.1.3. Suitable personal protective equipment, insulating tools and dedicated means must be used at work.
122.1.4. Auto-reclosing devices should be locked before proceeding with the work.
122.2. For high-voltage lines (110kV):
122.3. The worker must be trained and drilled to fit for working with the provided equipment, process and technology; must be tested to meet theoretical, practical standards, construction, repair and maintenance methods of the live grid.
122.3.1. In order to perform the works involving repair and maintenance of electrical lines, conducting surveys, formulating work plans, registering performance of the work with the operator, and issuing a work request should precede.
122.3.2. Before starting a work, auto-reclosing equipment must be locked automatically while manual reclosing must be prohibited.
122.3.3. Wearing any jewelry or carrying metal personal items at work shall be prohibited.
122.3.4. Health checks (including body temperature, blood pressure, eyesight, hearing ability) for the contractor’s staff at worksite must be carried out before starting the work.
122.3.5. The contractor’s staff can only work on one phase at a time.
122.3.6. Working in excess of the working load (mechanical load) and the operating voltage of working equipment and tools shall be prohibited.
122.3.7. Do not perform work:
122.3.7.1. in the dark or at night; at a poorly illuminated worksite (at the work location, the contractor’s staff is required to clearly notice the nearest live part).
122.3.7.2. in the absence of safe working conditions; lack of manpower; in the absence of the direct supervisor, electrical safety superintendent; when personal protective equipment, OSH equipment or working tools are not sufficient, below the given quality standards, or not fitted into the technological process.
123. Working in confined spaces
QCVN 34:2018/BLDTBXH on occupational safety for working in confined spaces issued as an attachment to the Circular No. 29/2018/TT-BLDTBXH dated December 25, 2018 of the Ministry of Labor, War Invalids and Social Affairs, and other regulatory documents stating modification or replacement thereof (if any), shall prevail.
V. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS
124. Implementation responsibilities
124.1. Entities and persons shall have the duty to comply with this Regulation and be subject to the inspection of state regulatory authorities in accordance with regulations in force.
124.2. Organizations and individuals participating in electricity activities and using electricity for production purposes may, based on their respective characteristics, issue rules or instructions on the implementation of specific safety precautions and measures for performing electrical works or using electricity within their workplaces provided that these rules or instructions do not conflict with this Regulation and other provisions of law.
125. Responsibilities for dissemination of information and guidance on implementation hereof
125.1. Departments of Industry and Trade of provinces and cities shall be responsible for disseminating and providing guidance on the implementation of this Regulation to organizations and individuals engaged in performing electrical works and using electricity for production purposes under the management of provincial authorities.
125.2. Industrial Safety Techniques and Environment Agency under the Ministry of Industry and Trade shall be responsible for disseminating information about and providing guidance on the implementation of this Regulation to Departments of Industry and Trade; organizations and individuals engaged in performing electrical works and using electricity for production purposes nationwide.
126. Handling issues arising from implementation hereof
In the course of implementation hereof, if there is any issue that arises, the Ministry of Industry and Trade should be promptly informed to consider taking relevant actions./.
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This translation is made by THƯ VIỆN PHÁP LUẬT, Ho Chi Minh City, Vietnam and
for reference purposes only. Its copyright is owned by THƯ VIỆN PHÁP LUẬT
and protected under Clause 2, Article 14 of the Law on Intellectual Property.Your comments are always welcomed
