MINISTRY OF INDUSTRY | SOCIALIST REPUBLIC OF VIETNAM |
No. 12/2008/QD-BCT | Hanoi, June 17, 2008 |
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
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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)
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.
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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ESTABLISHMENT OF THE WORKING SITE
Section 1. INSTALLATION OF BARRIERS, SIGNS, AND SIGNALS
Barriers, signs, and signals shall be installed at hazardous areas to give send danger signals.
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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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.
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.
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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
The direct commander shall closely cooperate with the organizations concerned, direct and inspect the work team to ensure the safety.
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.
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.
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.
Workers may not enter the areas that:
1. Are banned by the direct commander.
2. Are at risk of accidents.
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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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.
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.
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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.)
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
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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.
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
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.
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.
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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.
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.
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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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.
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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.
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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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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
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.
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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.
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
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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.
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.
1. Only trained and qualified people are allowed to operate specialized vehicles.
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The speed of vehicles must not exceed 5 km/h when moving within an electric station area.
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
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.
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.
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.
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.
The operation, maintenance, repair and inspection of cranes must comply with current regulations on lifting equipment.
When working at a height with a specialized vehicle, the direct commander shall command workers to stand at correct positions and wear safety harnesses.
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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Mọi chi tiết xin liên hệ: ĐT:(028) 3930 3279DĐ:0906 22 99 66
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.
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.
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.
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./.
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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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.