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MINISTRY OF INDUSTRY
AND TRADE
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SOCIALIST REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
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No. 12/2008/QD-BCT
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Hanoi, June 17, 2008
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DECISION
TO PROMULGATE THE
NATIONAL TECHNICAL REGULATION ON ELECTRICAL SAFETY
THE MINISTER
OF INDUSTRY AND TRADE
Pursuant to the Government's Decree No. 189/2007/ND-CP dated December
27, 2007 on defining the functions, tasks, powers and organizational structure
of the Ministry of Industry and Trade;
Pursuant to the Law on Technical regulations and standards dated June
29, 2006; the Government's Decree No. 127/2007/ND-CP dated August 01 2007
detailing the implementation of a number of articles of the Law on Technical
regulations and standards;
Pursuant to the Circular No. 23/2007/TT-BKHCN dated September 28, 2007
of the Ministry of Science and Technology providing guidance on the
formulation, assessment, and issuance of technical regulations;
At the request of the Director of the Industrial Safety Techniques and
Environment Agency,
DECIDES:
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Article 2. This
Decision takes effect after 15 days from the day on which it is published on
the Official Gazette and is applicable nationwide.
Article 3. Chief
of the Ministry Office, the Chief Inspector of the Ministry, Directors of
Departments affiliated to the Ministry, Directors of Services of Industry and
Trade of central-affiliated cities and provinces, organizations and individuals
concerned are responsible for the implementation of this Decision./.
THE MINISTER
Vu Huy Hoang
QCVN 01:2008/BCT
NATIONAL TECHNICAL REGULATION
ON ELECTRICAL
SAFETY
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The National Technical Regulation on Electrical Safety (QCVN01:2008/BCT)
is submitted by the Department of Safety Engineering and Industrial
Environment, promulgated by the Ministry of Industry and Trade together with
the Decision No. 12/2008/QD-BCT dated June 17, 2008.
QCVN01:2008/BCT provides for safety principles when working with power
lines and electrical equipment.
NATIONAL
TECHNICAL REGULATION
ON ELECTRICAL SAFETY
(Promulgated together with the Decision No. 12/2008/QD-BCT dated June 17,
2008 of the Minister of Industry and Trade)
Chapter I.
GENERAL PROVISIONS
Article 1. Scope of regulation
This Regulation provides for the safety measures before carrying out
construction, operation, experiments, and repair of power lines, electrical
equipment, and other works according to law.
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This Regulation is obligatory for all organizations and individuals that
participate in electrical works and use electricity for production within
Vietnam’s territory.
Article 3. Obligations of organizations and
individuals that participate in electrical works and use electricity
1. Comply with this Regulation and other safety regulations relating to
their assigned works.
2. Employers shall:
a) Ensure the safety conditions and provide personal safety equipment for
on-site employees and ensure safety for the community.
b) Provide training in necessary knowledge about safety for employees
according to law.
c) Inspect on-site safety measures.
3. When an organization or individual hires another organization or
another individual to do the works that might lead to electrical accidents,
both parties must reach an agreement that specifies the safety measures and
obligations of each party before carrying out the works.
Article 4. Interpretation of terms
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1. Employer is:
a) The owner of the facility or a person authorized by the to run the
production or business, or
b) The Director or Deputy Director of the facility; the Director of the
organization or unit that directly manage and employ workers, or
c) A manager of a construction site, a workshop, or an equivalent unit.
2. General Commander is the person that directs the work that is carried out
by multiple teams of the same electricity agency.
3. Direct Commander is the person in charge of giving assignments,
directing and supervising their workers throughout the operation.
4. Authorizer is the person that allows the work team to enter the site
when electrical safety at the site is assured.
5. Electrical safety supervisors are persons proficient in electrical
safety that are appointed by the work team to supervise the electrical safety.
6. Watchmen are persons appointed to monitor and give warnings about the
worksite safety to the public.
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8. Managing unit is the unit in charge of the management and
operation of power lines and electrical equipment.
9. Workers are employees of the work team who directly undertake the works
assigned by the direct commander.
10. Working live means working with energized devices using specialized
equipment and tools.
11. Working de-energized means working with electrical equipment
that have been disconnected from every source of supply.
12. Personal safety equipment is equipment used by workers to prevent
accidents for themselves.
13. Electrical equipment and materials are machinery, tools, and
equipment that use electricity; conductive materials, insulating materials;
supporting structures used for electricity supply.
14. Specialized vehicles are vehicles provided with equipment for special
purposes.
15. Disconnect means isolating the energized parts from the power supply.
16. Low-voltage electrical equipment is energized equipment with a
voltage of below 1,000 volts.
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Chapter II.
ESTABLISHMENT OF THE WORKING SITE
Section 1. INSTALLATION OF BARRIERS, SIGNS, AND SIGNALS
Article 5. Warnings
Barriers, signs, and signals shall be installed at hazardous areas to give
send danger signals.
Article 6. Outdoor equipment
For the high-voltage electrical equipment installed outdoors, the employer
shall take the following measures to prevent unauthorized people from entering
the restricted area:
1. Barricading.
2. Placing the “No entry” sign at the entry and exit.
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Article 7. Indoor equipment
For the high-voltage electrical equipment installed indoors, the employer
shall take the following measures to prevent people, except for workers of the
work team and their operators, from getting close to them.
Article 8. Putting up barriers around the working site
Barriers must be put up around the working site of the work team, of which
the distance to surrounding energized parts does not reach the measurements in the
table below, to separate the working zone from the energized part.
Voltage (kV)
Distance (m)
Up to 15
0.7
Above 15 to 35
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Above 35 to 100
1.5
220
2.5
500
4.5
The distance from the barrier to the energized part is specified below:
Voltage (kV)
Distance (m)
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0.35
Above 15 to 35
0.6
Above 35 to 110
1.5
220
2.5
500
4.5
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During the work, all equipment and materials must be put tidily to avoid
hurting people.
Article 10. Lighting at working positions
1. The employer must sustain the light intensity at working position in
conformity with regulations.
2. The employer must ensure that the lighting is not dazzling or causing
too much contrast.
Article 11. On-site warnings
The direct commander of the work team shall put up warning signs at
dangerous areas during the work to ensure safety for workers and the community.
Section 2. ASSURANCE OF PUBLIC SAFETY
Article 12. Putting up barriers
The work team shall take appropriate measures such as putting up barriers
around the working site to prevent unauthorized people from entering and
causing accidents or hurting themselves. Especially when working with
underground cables, the work team shall take measures to prevent people from
falling into the opening.
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The work team must put up warning signs before working to ensure safety
for the community.
Article 14. Working on the road
1. When carrying out works such as construction and repairs on the road,
the work team may restrict the traffic of vehicles and passengers to ensure
safety for the community.
2. Comply with the regulations of relevant functional authorities when
restricting the traffic, comply with the following requirements:
a) Put up warning signs and appoint people to instruct vehicles and
passengers to avoid causing danger to the community;
b) The width of the road for road vehicles to go through must be
conformable with the regulations of road management authorities.
3. Put up temporary barriers and direction signs when restricting
passengers to ensure the safe traffic.
4. When working near railroads, road, waterways or intersection between the
power line and the road, the work team shall request the agencies concerned to
appoint people to assist in the assurance of safety for vehicles and
passengers, if necessary.
Chapter III.
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Section 1. ORGANIZATION OF THE WORK TEAM
Article 15. Organization of the work team
A work team must have at least two people; one of them is the direct
commander.
Article 16. Appointment of the direct commander and
workers
The employer shall appoint suitable direct commander and workers that are capable
of doing their jobs safety.
Article 17. Appointment of the supervisor
1. The employer or the managing unit shall appoint an electrical safety
supervisor when a work team, which is not specialized in electricity or not
capable of electrical safety, works near energized items.
2. The managing unit shall appoint an electrical safety supervisor when
the work team works at electrically dangerous places.
Article 18. Works under taken by multiple work teams
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Article 19. Permission to work alone
The persons appointed to check the power line or equipment visually may do
this alone. Always treat the lines and devices as energized when checking.
Article 20. Duties of the general commander
The general commander shall coordinate the operation of work teams during
the work.
Article 21. Duties of the authorizer
1. The authorizer shall inspect the electrical safety engineering under
their management to prepare the worksite for the work team.
2. Provide the work team with information about de-energized devices,
energized parts, and special measures.
3. Sign permissions to work and handover the worksite to the work team.
Article 22. Duties of the electrical safety
supervisor
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2. Always be present at the worksite to supervise electrical safety for
workers; do not undertake other tasks.
Section 2. DUTIES OF THE DIRECT COMMANDER
Article 23. Cooperation
The direct commander shall closely cooperate with the organizations
concerned, direct and inspect the work team to ensure the safety.
Article 24. Inspection
1. The direct commander must grasp the works and safety measures suitable for
such works.
2. The direct commander shall:
a) Inspect and take safety measures where necessary;
b) Comply with the regulations on safety applicable to workers;
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d) Install, move, and remove electrical safety signs, barriers, and
portable grounding while working and form all workers.
Article 25. Provide cursory health checkups for
workers
Before the carrying out a work, the direct commander shall provide cursory
health checkups for workers. If a worker might not be able to do his tasks
normally, he must not participate in the work.
Article 26. Explanation
Before the work team carries out the work, the direct commander shall
provide the workers with explanation about the contents and order of the works
and the safety measures.
Article 27. Supervision
The direct commander must be continuously present at the worksite,
supervise and take measures for preventing workers from committing acts that
might lead to accidents during the work.
Section 3. RESPONSIBILITY OF WORKERS
Article 28. Responsibility of workers
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2. Comply with instructions of the direct commander and do not perform the
tasks not being assigned by the direct commander. If the task assigned by the
direct commander is impossible or is considered dangerous, the worker must
immediately stop, report, and await orders from the direct commander.
3. If the order given by the direct commander cannot be followed, or the
equipment, working conditions are considered unsafe, the worker is entitled to
refuse to follow such order and inform a competent person.
Article 29. Restricted areas
Workers may not enter the areas that:
1. Are banned by the direct commander.
2. Are at risk of accidents.
Article 30. First aid
1. Each work team must have a first aid kit.
2. When an accident happens, all workers of the work team must give first
aid to the victim and inform the nearest medical facility.
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PROTECTIVE EQUIPMENT
Article 31. Requirements
1. All workers shall use protective equipment that suits their tasks. The
direct commander shall inspect the use of protective equipment of their
workers.
2. While working near a line with a voltage of 220kV or above which pose a
risk of electrocution due to electrostatic induction, the workers must be
provided with specialized protective equipment.
Article 32. Inspection of protective equipment
1. The protective equipment must meet the standards.
2. The protective equipment must be inspected and maintained in accordance
with the instructions of the producers and current law. It is prohibited to use
untested, expired, or unreliable protective equipment.
Article 33. Daily inspection
1. Before using protective equipment, the user must inspect them and only
use them if they meet the requirements.
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Article 34. Using equipment and tools while working
live
The direct commander shall request workers to use tools and equipment for
electrical repairs according to the work contents. It is prohibited to carry
out electrical repairs without safety equipment and tools.
Article 35. Periodic inspection and maintenance of
tools and equipment
1. Tools and equipment necessary for electrical repairs must be
periodically inspected according to standards and be maintained as regulations.
2. It is prohibited to use unchecked, expired, or unreliable protective
equipment for electrical repairs.
Article 36. Transporting protective equipment
Protective equipment must be packaged properly to avoid being damaged,
deformed, dirty, oil, dirt, moisture, etc. during the transport.
Chapter V.
GENERAL SAFETY MEASURES
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Article 37. Planning
The employer must make the working plan that suitable for the contents and
order of the work with the cooperation with relevant departments (equipment
management unit, operating unit, maintenance unit, etc.)
Article 38. Work registration
Before working with energized equipment where electrical safety measures
must be taken, the work team shall apply for a registration with the managing
unit.
Article 39. Cancellation or postponement of works due
to bad weathers
1. Upon the occurrence of heavy rain, strong wind, lightning, or thick
fog, outdoor works may be cancelled or delayed.
2. Upon the occurrence of rain condensation, outdoor works using
insulating equipment are forbidden.
Section 2. WORK ORDERS AND WORK PERMITS
Article 40. Work permits
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2. Each work team must obtain a work permit to do a separate work.
3. The direct commander shall only allow workers to work after the
permission from the authorizer is obtained and necessary safety measures are
taken.
Article 41. Work orders
A work order is a written or spoken order that is given directly or by
phone. The order receivers must record it in the logbook. The logbook must
specify: the order giver, the work location, commencement time, full names of
the direct commander and workers. The work completion must be written in the
logbook.
Article 42. The works that require work orders and
work permits
Comply with the following regulations when working with electrical
equipment and materials, near or related to energized equipment and materials:
1. Comply with the work order if the work does not require preparation for
the worksite, is away from energized places, or when operators fixing equipment
failure on their shift under the supervision of the shift workers (no work
permit required).
2. Comply with the work permit when:
a) Working de-energized;
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c) Working near energized parts.
Article 43. Contents of a work permit
A work permit must contain the following information:
1. Full name of the permit issuer.
2. Full name of the general commander (if any).
3. Full name of the electrical safety supervisor (if any).
4. Full name of the authorizer.
5. Full name of the direct commander.
6. List of workers.
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8. Working location.
9. Working time (time and date).
10. Working conditions (de-energized or live, near energized places).
11. Working range.
12. Safety measures taken at the working site.
13. Instructions or warnings given by the authorizers.
14. Other information (if any).
15. Work completion.
The template of the work permit is provided in the Appendix.
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Article 44. Confirm safety measures before working
Before the work is carried out, the direct commander must confirm that the
safety measures at the worksite have been properly and adequately taken.
Article 45. Checking equipment
Before working, workers shall check safety equipment, protective
equipment, tools, and machinery such as test pens
Section 4. SAFETY PRINCIPLES
Article 46. Working with loads
When lifting or lowering a load:
1. The worker must not stand or do anything within the dangerous zone of
the lifting device.
2. The durability bearing cable must be suitable for the load.
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Article 47. Transporting heavy items
Take safety measures when transporting heavy items.
Article 48. Prevention of loss of working ability due
to vibrating equipment
Take safety measures when working with vibrating such as chainsaws,
rammers, etc.
Article 49. Checking before climbing up the platform
1. Before climbing up scaffolding, the worker must check:
a) The conditions of the platform or the pole;
b) The position of the platform and the
climbing safety, structure and wires of the pole;
c) Safety equipment and protective equipment.
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3. The direct commander shall stop the work if it threatens the safety of
humans and equipment.
Article 50. Checking disconnection and leakage
When climbing up the electric pole, the worker must check de-energizing
leakage by the test pens.
Article 51. Using climbing equipment
When working at a height or a depth at 1.5 meter from the ground, the
worker must use appropriate climbing equipment.
Article 52. Fall prevention
When working at a height, the worker must use a safety harness. The safety
harness must be firmly fixed.
Article 53. Preventing tools and materials from
falling from a height
When using materials and tools from a height and when moving them up or
down, the user must take measures for preventing them from falling down.
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1. Take measures to avoid tilting or dropping poles when installing and
removing them.
2. Take measures to avoid accidents due to insufficient safety distance when
installing and removing poles near power lines.
Article 55. Working with wires
Comply with the following requirements when installing or removing
electrical wires:
1. Inspect the conditions of the supporting structure and cable, ensure
the normal operation and take measures to prevent collapse of temporary cables,
etc.
2. Take measures to ensure safety for the public such as putting warning
signs, barriers, etc. and appoint watchmen where necessary.
Article 56. Working with electrical equipment
Take measures for avoiding dropping, collision, or accidents when lifting,
lowering, or removing electrical equipment (transformers, circuit breakers,
ceramic knobs, etc.) due to insufficient safety distance between the equipment
and the electric wires or other electrical equipment.
Article 57. Digging
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2. The work team shall take measures to prevent people from falling into
the holes such as setting up barriers, beacons, and appoint watchmen where
necessary.
3. Before digging a hole, the work team must identify underground works
below or near the worksite and take measures to avoid accidents or prevent them
from being damaged. When discovering unexpected underground works or damaged
underground works, the work team shall stop the work and inform a responsible
person. When an underground work is damaged and causes accidents, the work team
shall take appropriate measures for preventing further accidents and
immediately inform the organizations concerned.
Section 5. WORK SUSPENSION
Article 58. Requirements during work suspension
When suspending a work, the safety measures that were taken such as
grounding, barriers, and warning signs must be kept intact during the
suspension. If no person stays at the site at night, the work team shall take
appropriate measures to prevent accidents. Check and ensure all safety measures
are the same as they were before the suspension when resuming the work.
Article 59. Handling unreliable equipment
1. When a device is found broken and might harm humans, the workers must
immediately inform the responsible person after emergency measures have been
taken to prevent it from harming humans.
2. When being informed about a broken device that might hurt humans, the
employer must immediately take appropriate measures.
3. Cut off power when a risk of short-circuit or electrocution is present
such as touching energized wires. Take appropriate measures if power cannot be
cut off such as appointing watchmen to prevent accidents for humans.
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When an accident happens, the direct commander and workers must
immediately stop the work and:
1. Take appropriate measures to prevent other accidents and stay away from
the broken device if danger is probable.
2. Give first aid to the victims and contact nearest medical facilities.
3. Inform the organizations concerned
about the accident.
Article 61. First aid
Workers shall give first aid to the victims as follows:
1. Provide artificial respiration, stop the bleeding, etc.
2. Call an ambulance.
Article 62. Stopping and suspending works due to bad
weather
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Section 6. WORK COMPLETION
Article 63. Before handover
The direct commander shall follow the order below:
1. Directly inspect the completed works, gather tools, and clean the
worksite.
2. Order the workers to leave the working positions, except for the people
in charge of removing safety measures.
3. Order the removal of safety measures taken by the work team before the
work is carried out.
4. Check to ensure the sufficient the number of people, tools, materials,
and equipment.
5. Prevent workers from returning to the working site.
Article 64. Worksite handover
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Chapter VI.
SAFETY WHEN WORKING WITH ELECTRICAL EQUIPMENT
Article 65. Disconnect to work
1. When closing or cutting supplying power to the electrical equipment,
the operator must be provided with appropriate protective equipment.
2. The disconnection must ensure that the equipment being work with, which
is disconnected from all energized parts (except for GIS equipment), is seen
after the disconnection.
Article 66. Working with generators and transformers
1. Cut all switchgears that are connected to the power line when working
with deactivated devices such as generators, synchronous compensators, and
transformers in order to prevent unexpected power supply.
2. Experiments with generators may be conducted when they are running
without excitation. Experiments must be conducted in accordance with approved
experiment processes.
Article 67. Flammable materials
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2. Avoid creating explosive hydrogen compounds when using hydrogen-cooled
generators and synchronous compensators cooled by hydrogen. Such compounds are
explosive when the hydrogen content in the atmosphere reaches 3.3% - 81.5%.
3. Avoid creating explosive compounds of hydrogen and oxygen when running
electrolytic equipment. Such compounds are explosive when the hydrogen content
and oxygen content in the atmosphere reaches 2.63% - 95%.
4. Take fire and explosion prevention measures such as ventilating the
working site, separating the system from running systems when doing repairs in
the seal oil system and ventilation system of hydrogen-cooled generators,
synchronous compensators, electrolyzers that are deactivated.
5. Do not carry out hot works or works that emit sparks on the shell of
the generator, compensator electrolyzer, or on the pipes of petroleum system
that contain hydrogen.
6. The hot works such as welding may be carried out at least 15 m away
from petroleum systems that contain hydrogen. Take special safety measures such
as covering, checking for the existence of hydrogen in the air at the worksite,
etc.
7. Hot works in a room where the electrolyzer is located may be carried
out when it is deactivated, no hydrogen is found in the air, and the
ventilation system operates continuously. When carrying out hot works with a
running electrolyzer, all pipes that connect the running electrolyzer and the
repairing equipment must be removed and capped. The worksite where hot works
are carried out must be covered to prevent sparks from being emitted all over
the place.
Article 68. Working with electric engines
1. Lock the transmission system that supply power to engines, lock the power
supply of the engines, and put up warning signs to avoid accidental power
supply when working with engines without disconnecting them from the electric
circuit.
2. Short-circuit the three-phase circuit and ground three electrodes that
supply power for the engine at the power supply if electrodes of an engine must
be removed from the power supply when working with the engine.
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4. Take measures to prevent reverse rotation when working with pumps or
fans.
Article 69. Working with switchgears
1. Take the following measures before working with switchgears that have
automatic tripping mechanism and remote control:
a) Disconnect the power supply;
b) Close the valve that leads compressed air to the circuit breaker
chamber or the run mechanism and release all gases;
c) Put up safety signs;
d) Lock the valve that leads compressed air to the cutter chamber or
remove the valve handle when working inside the chamber.
2. The circuit, the circuit of the transmission system, and the signal
circuit may be closed to test the switchgear without handover.
During the trial, the operator or the direct commander (if agreed by the
operator) shall supply power to the control circuit, open the valve, and remove
the signs.
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3. Before working in a gas tank, the workers must:
a) Close all valves of the gas pipeline; lock the valve or remove the
valve handle; put up a “no service” sign;
b) Release all gas from the tank and open the release valve.
4. Always control the circuit breaker with a remote control. Do not use
the control panel at the circuit breaker. Only close the circuit breaker this
way when preventing accidents or rescuing victims of electrical accidents.
5. Do not trip the circuit breaker if it does not trip after using the
remote control, or all electrodes are not cut.
Article 70. Distance when digging
1. When digging, the equipment such as cars, excavators, etc. must work at
least 1 meter away from the electric cable; the vibrating digging equipment
must work at least 5.0 meters away from the cable.
2. Identify the location and depth of the cable under the supervision of
the operator when digging above the electric cable. Do not use crowbars and
shovels to dig at 0.4 m away from the cable.
Article 71. Cable reel
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Article 72. Peeling cables
Workers must be careful when removing the cover and insulator of the cable
to avoid being hurt by the tools and hurting other people. Workers must be
careful to avoid damaging other parts of the cable.
Article 73. Measuring transformers
When working with protective circuits, workers must avoid interfering with
the grounding at the secondary parts of voltage transformers and current
transformers. Secondary circuits of the current transformers must not be
exposed.
Article 74. Working with battery systems
1. Prepare neutralizing substances suitable for the battery system.
2. Wear working clothes, protective glasses and rubber gloves when working
with acid and alkali to prevent the body from being affected by acid and
alkali.
3. Do not smoke in battery room. Put up a sign that says “Battery room –
Inflammable – No Smoking” sign the battery room.
4. The battery room must be ventilated to prevent poisoning, fire, and
explosion due to the gas released by the battery system.
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NON-LIVE LINE WORKING
Article 75. Working order
When working at a de-energized place, the work team must comply with the
following order:
1. Confirm that the worksite is de-energized.
2. Install portable grounding so that the whole work team is in the
protected zone.
3. Ground every part of the de-energized device that might supply
electricity to the worksite.
Article 76. Installation and removal of portable
grounding
1. The work team shall install and remove portable grounding in accordance
with the instructions of the direct commander.
2. When multiple work teams do relevant works, each team shall set up a
separate portable grounding.
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4. When installing and removing portable grounding, workers must use
insulating gloves and long sticks.
5. The grounding wire is made of copper or soft alloys and must be able to
resist and electrodynamic and thermal effects.
6. The lead in contact with the ground shall be installed first; the lead
connected to the conductor shall be installed later. This process shall be
reversed when removing grounding.
Article 77. Permission to start working
The direct commander shall allow the work team to work after all safety
measures are taken.
Article 78. Numbering equipment
The numbers of circuit breakers, disconnectors, cable leads, must be
clearly indicated to avoid errors.
Article 79. Connecting and disconnecting equipment
1. Power lines and electrical equipment must be energized and de-energized
with suitable circuit breakers.
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3. Confirm that the power line is
unloaded when using a disconnector.
Article 80. Interlock circuits
After tripping the switchgears, the operator shall:
1. Lock the transmission, the control circuit, and the interlock circuit
of the switchgear.
2. Put up safety signs.
3. Appoint watchmen where necessary.
Article 81. Releasing excess electric charge
1. The work team must release excess electric charge and install grounding
before working.
2. Release excess electric charge during the operation and use protective
equipment.
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1. Confirm that the worksite is disconnected before working de-energized.
2. Check for leakage before working with a disconnected power line that
shares the same pole with another energized power line.
3. Check for induced voltage with voltage testers if the disconnected
circuit is located near or across a high-voltage circuit. Workers must inform
the direct commander when induced voltage is detected. The direct commander
shall provide appropriate solutions and instructions to ensure safety for the
workers, such as grounding, and do not allow the work until appropriate
measures and taken.
Article 83. Preventing reverse voltage
1. Portable grounding must be installed to prevent inverse voltage to the
work site from the secondary coil of the transformer or other low-voltage power
supplies.
2. Take appropriate measures for preventing inverse voltage from
independent generators of clients when disconnecting a power line operating at
a voltage up to 1000 V.
3. Remove the ground wires connected to the phase wires before remove the
ground wire connected to the neutral wire.
Article 84. Handing over the worksite to the managing
unit
The work team shall handover the site to the managing unit after the work
is completed and grounding is removed by the work team.
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SAFETY ASSURANCE WHEN WORKING LIVE WIRES
Article 85. Working safety
1. Use appropriate protective equipment when working with energized power
lines.
2. Check for leakage at metal components related to the energized power
lines.
3. Workers must not wear jewelry or metal items when working with or near
energized power lines.
4. When working live, the nearest energized parts must be visible at the
position of workers.
Article 86. Conditions for working live
1. The list of energized devices while working and the list of live line
works must be approved by competent persons.
2. The persons that do live-line works must be trained in using equipment,
the process, and technologies with which they are provided.
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1. If the risk of electrocution is
posing, the employer must request workers to:
a) Use appropriate protective
equipment.
b) Cover the charged components of the electrical equipment by protective equipment
to eliminate the risk.
2. Workers must use protective clothing and protective equipment at the
request of the employer.
Article 88. Measures for works with a voltage above
1,000 V
1. If workers are at risk of electrocution when working with circuits with
a voltage of 1,000 V or above such as checking, repairing, cleaning energized
parts or ceramic insulators, the employer must request workers to use equipment
and tools for working live. In this case, the minimum permissible distance to
the worker must be conformable with the table below:
Voltage (kV)
Minimum permissible distance (m)
Up to 35
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Above 35 to 100
1.0
220
2.0
500
4.0
2. Workers must not do live line works alone. In an emergency, workers must
inform the responsible person and await orders from the direct commander.
3. Ensure the distance to the wire
according to Clause 1 of this Article when taking metal tools or components up
the pole.
Article 89. Using covers
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Article 90. Strengthening before working live
Repairs of energized power lines shall only be carried out if the lines
and the poles are completely reliable. If the pole parts are not reliable,
the pole must be strengthened before replacing them.
Article 91. Replacement of ceramic insulators
When replacing ceramic insulators on the power lines operating at a
voltage of 110 kV or above, only the first and the second insulators from the
crossbar may be touched. Only touch the first insulator on a 35-kV power line
if there are two insulators. The first and the second insulator may be touched
if there are three or four insulators.
Article 92. Insulation cleaning
The insulation cleaning must be carried out by at least two people using
appropriate tools and protective equipment.
Article 93. Bare-hand working
1. Do not touch the ceramic insulators or other parts that are charged to
the same voltage as the line when standing on insulating equipment that has a
voltage equal to that of the wire. Wear insulating gloves when installing and
removing the parts with various voltages of the phase being repaired.
2. Do not give or take anything when working on insulating equipment that
is charged to the same voltage as the line.
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Voltage (kV)
Minimum distance (m)
Up to 110
0.5
220
1.0
500
2.5
Chapter IX.
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Article 94. Working near power lines that have a
voltage 1,000 V or above
1. Workers must be provided with and
use appropriate protective equipment.
2. Workers must keep a safety distance from energized power lines. The
safety distances at various voltages are provided below:
Voltage (kV)
Minimum permissible distance (m)
Up to 35
0.6
Above 35 to 66
0.8
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1.0
Above 110 to 220
2.0
Above 220 to 500
4.0
3. If the minimum permissible distance according to Clause 2 of this
Article cannot be ensured, the employer may not allow workers to work near energized
power lines. In such cases, power supply must cut before working.
Article 94. Working near power lines operating a
voltage of below 1,000 V
1. If workers are at risk of electrocution at a close distance with the
power line that has a voltage of below 1,000 V, the direct commander shall
request workers to cover the live energized parts of the equipment by
protective equipment to avoid risk of danger.
2. Workers must use protective clothing and protective equipment when
covering the energized parts.
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1. When carrying out the works that might drop or loosen wires (such as
disconnecting or connecting wires at the beginning of the ceramic chain) at the
intersection of the pole an other power lines that have a voltage of above
1,000 V, those wires may be keep energized if the wire that needs repairing is
below the energized power lines.
2. When replacing a wire at the intersection, the work team must take
measures for preventing the wire that needs replacing from being thrown to the
energized power lines above.
Article 97. Working with lighting wires
When working lightning wire on the rod that is located within the affected
area of energized power lines, the lightning wire must be connected to the
steel pole, or the grounding wire of the concrete pole or wooden pole, to
eliminate induced voltage. To prevent induced voltage that might harm workers
when working with wires, the work team must connect the wire with the crossarm
of the steel pole or the grounding wire of the wooden pole or concrete pole at
the worksite.
Article 98. Using steel cables
1. The minimum permissible distance
between the steel cable and the guy wires to the energized power lines are
provided below:
Voltage (kV)
Minimum permissible distance (m)
Up to 35
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Above 35 to 110
3.0
Above 110 to 220
4.0
Above 220 to 500
6.0
2. If the guy wire may be moved close to the energized wires at a shorter distance
than the distances specified in Clause 1 of this Article, such guy wires must
be keep at a sufficient distance from the energized wires. The steel cable must
be arranged so that it would not be thrown to the energized wires if it were
broken.
Article 99. Working on a disconnected power line that
share the same pole with energized power lines
1. Only climb up a pole, on which one circuit is disconnected and the
other circuit is still energized, when the distance between two nearest wires
of two circuits is not shorter than the distance provided in the table below:
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Minimum distance (m)
Up to 35
3.0
66
3.5
110
4.0
220
6.0
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3. Do not work with 2-circuit wires of which one circuit is still
energized in strong wind that might shake the belt and the cable and cause
difficulties for workers on the pole.
Chapter X.
MEASURES FOR WORKING AT DANGEROUS POSITIONS DUE TO
LACK OF OXYGEN
Article 100. Preparation before work
1. Set up barriers
Appropriate measures such as setting up barriers must be taken to prevent
unauthorized people from entering the worksite. Danger signs must be place at
noticeable places.
2. Rescue equipment
The work team must have rescue equipment such as respirators. Workers must
put rescue equipment at convenient places to use in an emergency. The number of
respirators must be larger than the number of members of the work team.
3. Measuring of concentrations of oxygen and toxic gases.
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Gas
Safe concentration
Oxygen
≥ 18%
Carbon monoxide
≤ 0.005% (50ppm)
Flammable gas
< 30% below flash point
Hydrogen sulfide
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b) If the concentration of flammable gas does not meet the standard in Point
a of this Clause, the direct commander shall order all workers to leave the
worksite and go to a safe place. Do not use flame or flammable products, and
immediately take appropriate measures such as ventilation.
c) If the concentrations of oxygen and hydrogen sulfide does not meet the
standards in Point a of this Clause, workers must ventilate the worksite to
increase the oxygen concentration up to 18% and decrease the concentration of
hydrogen sulfide to 10ppm or below.
4. Do not use pure oxygen to ventilate.
Article 101. Measures taken during work
1. Ventilation
The worksite must be sufficiently and continuously ventilated to keep the
concentration of oxygen stable through out the work.
2. Using flammable products
The use of fire and flammable products must be prohibited, unless it is
necessary. When the use of fire and flammable products is necessary, workers
must do it on the ground as much as possible.
3. Appointment of watchmen
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Article 102. Measures taken when accidents happen
1. Evacuation
Workers must immediately inform the direct commander when realizing risks
of accidents such as fire, explosion, or lack of oxygen at the worksite. The
direct commander shall assess the situation and order workers to stop working,
leave the worksite and go to a safe place if necessary. The work team must take
necessary measures to minimize risk of accidents.
2. Medical examination and treatment
The employer must consider the health of the workers that are affected by
the lack of oxygen or poisoned by toxic gas to provide medical examination and
treatment.
Chapter XI.
SPECIALIZED VEHICLES
Article 103. Operation
1. Only trained and qualified people are allowed to operate specialized
vehicles.
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Article 104. Speed
The speed of vehicles must not exceed 5 km/h when moving within an
electric station area.
Article 105. Minimum distance
When moving in a station area, the shortest distance from any part of the
vehicle to the energized parts of the station must not fall below the distances
provided in the table below:
Voltage (kV)
Distance (m)
Up to 35
1.0
Above 35 to 110
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220
2.5
500
4.5
Article 106. Grounding
When carrying out partially de-energized works or working live near
energized parts, the platform of the crane truck, ladder truck, or bucket truck
must be grounded.
Article 107. Vehicle problems
1. When there are electric arcs between the vehicle and the
energized parts, do not touch the vehicle nor leave the vehicle nor get on the
vehicle before the source of electric arc is disconnected.
2. Jump out of the vehicle if it burns and power supply is not
disconnected. Jump with both legs and stand still; jump with both legs to get
away from the vehicle where necessary.
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Specialized vehicles must be inspected periodically.
Article 109. Forbidding operation
Do not operate crane trucks, ladder trucks, bucket trucks, etc. in strong
wind.
Article 110. Operation plan
1. When using a specialized vehicle, the employer must make an operating process
that suit the space and area of the worksite, the category and capacity of the
vehicle, the type and shape of the load, and ensure sufficient operators
according to plan.
2. The operation plan must describe the itinerary and operation method of
relevant specialized vehicles.
3. The employer must propagate the operation plan among the workers
concerned.
Article 111. Fall prevention
1. When a worker is operating a specialized vehicle, the direct commander
shall take safety measures such as ensuring sufficient width, leveling the
ground, take measures for preventing the road from being damaged, etc. to
minimize dangers to workers such as vehicle falling, etc.
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3. The vehicle operator must comply with the instructions of the guide.
Article 112. Collision prevention
When working with specialized vehicles, the direct commander must not
allow workers to enter the dangerous zones of such vehicles.
Article 113. Crane
The operation, maintenance, repair and inspection of cranes must comply
with current regulations on lifting equipment.
Article 114. Safety harness
When working at a height with a specialized vehicle, the direct commander
shall command workers to stand at correct positions and wear safety harnesses.
Chapter XII.
TESTING STATIONS AND LABORATORY
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1. The places having a voltage of 1,000 V or above in the testing station
or laboratory must be separated with barriers.
2. The distance from the inductors of the conductor of the tested
equipment to the grounded fixed barrier must not be shorter than the distance
provided below:
a) For pulse voltage (amplitude values)
Voltage (kV)
Distance (m)
Up to 100
0.5
Above 100 to 150
0.75
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1.0
Above 400 to 500
1.5
Above 500 to 1000
2.5
Above 1000 to 1500
4.0
Above 1500 to 2000
5.0
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6.0
b) For industrial frequency voltage, effective voltage and direct current:
Voltage (kV)
Distance (m)
Up to 6
0.1
Above 6 to 10
0.2
Above 10 to 20
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Above 20 to 50
0.5
Above 50 to 100
1.0
Above 100 to 250
1.5
Above 250 to 400
2.5
Above 400 to 800
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The distance to the temporary barriers must be three times as longer as
the distances above.
3. The height of fixed barriers must not be shorter than 1.7 meters; the
height of temporary barriers must not be shorter than 1.2 meters. The barrier
structure must ensure that not people accidentally touched energized parts
4. The doors of barriers must be opened outwards or to the sides. The
doors must be locked by automatic locks and can be unlocked from the inside
without keys.
5. The barriers of testing locations within a testing station do not have
to be locked if unauthorized people cannot access these places.
6. Fixed barriers can only be disassembled with keys or special tools. Do
not enter to cheek transformers until their covers are grounded and the
distance from the lowest ceramic insulators are not shorter than the values
below:
Voltage (kV)
Distance (m)
Up to 10
1.5
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2.0
Above 35 to 110
2.5
7. The transformers used for testing insulation must be connected to
circuit breakers that automatically trip when insulation fails in order to minimize
short-circuit.
8. The capacitors and power inverters used in the testing diagram that are
put outside the testing areas must be barricaded.
9. The frames, shells, bodies of test subjects and testing equipment,
testing tables, portable power tools, metal barriers, and measurement devices
in metal shells must be grounded. If the shell of a device cannot be grounded
for some reason, it must be barricaded.
10. In the diagram of function generators and cascade DC generators, a
device that automatically grounds all capacitor must be inserted when
rectifiers are disconnected.
11. The equipment with high electricity capacitance that are not
participated in the testing but located in the testing areas must be
short-circuited and grounded.
When testing equipment with high electricity capacitance, such as
capacitors and cables, the testing areas must have equipment for
short-circuiting and connecting the test subjects to the ground.
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Article 116. Periodic inspection of testing
equipment and devices
The managing unit of the testing station or laboratory must periodically
check the testing equipment and devices. The defective equipment and devices
must not be used.
Article 117. Confirming testing circuits
1. Before starting the testing, the circuit that connects tested devices
must be checked to confirm the accuracy of the testing diagram.
2. Only install and remove test subjects when the direct commander
permits.
3. The testing diagram must be checked to prevent reverse voltage through
the transformer before the connection.
Article 118. Arcing testing
Before doing arcing tests or other risky tests, workers must:
1. Assure that no people are in the dangerous area.
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3. Put up warning signs and barricade to prevent unauthorized people from
entering the testing area.
Article 119. Capacitors
1. The circuit that supplies the capacitors must have a circuit breaker
located at the secondary circuit of the tested transformer.
2. Only install and remove test subjects when the direct commander permits
and after the power supply to connecting capacitors is cut off.
Article 120. Testing mechanical strength of
insulators
Do not stand near the testing area when testing the mechanical strength of
insulators (ceramic, glass, synthetic plastic, etc). Take measures for
eliminating risk of accidents to workers caused by flying fragments.
Article 121. Prevention of testing voltage
1. To prevent testing voltage from affecting the working voltage, the
distance between two energized parts must comply with the table below:
Normal voltage of the device (kV)
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10
15
20
35
Minimum distance (cm)
15
20
25
50
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a) The testing device shall be divided into two parts: one part is where
the devices operating at a voltage below 1,000 V is placed and the operator is
positioned; the other part is where all devices and wires operating at a
voltage of 1,000 V or above are placed;
b) The devices operating at a voltage of 1,000 V and above must be
carefully barricaded to prevent people from getting close to them;
c) Doors of the devices that have a voltage above 1,000 V must have
electric interlocks so that the voltage above 1,000 V is cut when the door is
opened and a light is turned on when this part is energized;
d) The arrangement of all devices operating at a voltage below 1,000 V
must facilitate the operation and inspection.
Chapter XIII.
IMPLEMENTATION
Article 122. Responsibility for the implementation
1. Electricity users and participants in electrical activities shall
provide instructions to ensure safety during such activities and electricity.
Those instructions must not contradict this Regulation and other laws.
2. Services of Industry and Trade of provinces and cities shall provide
instructions and inspect the adherence to this Regulation of local electricity
users and participants in electrical activities.
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4. Electricity users and participants in electricity activities shall send
periodic reports on electrical safety engineering to Services of Industry and
Trade, Services of Industry and Trade shall send summary reports to the
Ministry of Industry and Trade before the 15th of June and December.
The reports shall focus on the inspection of protective equipment, electrical
accidents and other unusual events.
Article 123. Settling difficulties during the
implementation
Difficulties that arise during the implementation should be reported to
the Ministry of Industry and Trade for consideration and settlement./.
APPENDIX
WORK PERMIT
ISSUER
………………….....
WORK PERMIT
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1. Recipient:
1.1. General Commander (if any):
1.2. Direct commander:
1.3. Workers: (quantity)
1.4. Work
location:.............................................(1)..........................................
1.5. Work
contents:.............................................(2)..........................................
…………..................................................................................................................
1.6. Schedule:
- Begin at (time and date):
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1.7. Working conditions (partially or completely disconnected devices,
power lines):
Date of issue:
Issuer:
Full name ………………………………… Position: ……………….............................
Signature:
.................................................................................................................
2. Procedure
2.1. Disconnected devices, wires, and wire segments: …….…(3)…………
2.2. Grounding positions: ………………………………………(4)…………………
2.3. Positions of barricades and warning signs: ………………………(5)……………
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2.5. Warnings and instructions: …………………………………(7)…………………
2.6. Commencement time (time and date):
Authorizer:
Full name ………………………………… Position: ……………….............................
Signature:
................................................................................................................
3. Worksite handover
3.1. Inspected on-site safety measures: …………………………
3.2. Additional safety measures and grounding positions: ………………(9)………
Commencement time (time and date):
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Full name ………………………………… Position: ………………...........................
Signature:
..............................................................................................................
1.2. Direct commander (signature and full name)
Full name ………………………………… Position: ………………..........................
Signature:
...............................................................................................................
Electrical safety supervisor (signature and full name – if any):
Full name ………………………………… Position: ………………...........................
Signature:
..............................................................................................................
4. List of workers (and replacements – if any)
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Full name
Time and date
Signature
Arrival
Departure
1
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2
3
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4
5. Permission to work, to finish daily work, and to change working
location:
No.
Working location
Time and date
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Authorizer (signature or name)
Begin
Complete
1
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4
6. Work completion:
6.1. All works are completed, tools are gathered, people, grounding, and safety
measures are removed to ensure connection safety. The direct commander
has handed over the worksite to Mr./Mrs. ………………………………………., Position: ………………………
at ………………………………………….
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Signature of the General Commander (if any):
6.2. The worksite is handed over and the work permit is closed at (time
and date):
Authorizer (signature or name):
Finish at (time and date):
Issuer (signature or name):
Notes: Depending on the production organization and actual conditions, the
participant in electricity activities and electricity users shall provide
instructions on the work permit. Those instructions must not contradict this
form.