Regulations and requirements for safe operation of

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Regulations and requirements for safe operation of electricians at the construction site

1. On site installation, maintenance or removal of temporary power works must be completed by electricians. The electrician level shall adapt to the difficulty and technical complexity of the project

2. Electricians should be familiar with the performance and use methods of electrical safety tools. When working on line or after power failure, they should wear insulating gloves, insulating shoes and tools with insulating handles; When working at heights, use electrician safety belt

3. On site temporary electricians should be familiar with the safety technical specifications of temporary power engineering according to the report of market research organization research and markets, abide by the safety technical operation procedures of electricians, be responsible for checking and protecting the integrity of electrical devices and protective facilities, strictly prohibit the operation of equipment with defects, and make good records of electrician maintenance work

4. When working on electrical equipment with total or partial power failure, electricians should take the following safety technical measures:

(1) power failure

A. reliably disconnect the equipment under maintenance from the power supply, that is, disconnect all aspects of power supply that may send power to the equipment under maintenance or reverse power to the equipment under maintenance

b. disconnect the power supply and pull off at least one switch with obvious disconnection point

c. in case of power failure, the load must be stopped first, then the switch (circuit breaker) must be pulled, and finally the disconnector must be opened. It is forbidden to pull the disconnector with load

d. workers adjacent to live equipment shall keep a safe distance from the live parts during work

(2) electricity verification

a for this purpose Conduct phase by phase, and check the power of each phase on both sides while checking the switch or knife switch in the off position

b. when checking the power of the power cut cable line, if the line is not connected with the three-phase load that can form the discharge circuit, it should be fully discharged

c. the permanent signal or sign indicating that the equipment is disconnected, the locking device signal indicating that it is allowed to enter the Bay, and the connected voltmeter indicating no voltage and other no voltage signal indications can only be used as a reference, and cannot be used as the basis for the lack of power of the equipment

d. insulating gloves must be worn during high-voltage electricity inspection

(3) install grounding wire

a. install grounding wire for all aspects that may send power to power-off equipment. The grounding wire should be installed in a place that can be seen at the working place. The distance between the grounding wire and the live part shall comply with the provisions of safety distance

b. if the maintenance part is divided into several parts that are not electrically connected (if the accuracy reaches 1%, it is enough to separate the bus sections with disconnectors or switches), each section should be electrically tested and grounded respectively

(4) hanging signs and installing temporary barriers

hanging signs can remind relevant personnel to correct the wrong operations and practices in time. In order to prevent the wrong closing and power transmission to the equipment that is operated by someone due to misoperation, it is required that the switch that can send power to the working place and the operating handle of the knife switch should be hung with no closing and someone works! Signboard of. If the power-off equipment has two disconnection points in series, the signboard should be hung on the knife switch handle close to the power supply. For switches and knife switches operated remotely, the signboard shall be hung on the operation handle on the control panel; For the knife switch that can be operated remotely and locally at the same time, a signboard should be hung on the knife switch operation handle. After hanging the grounding wire in the switch cabinet, hang a grounded sign on the door of the switch cabinet

when working on the outdoor structure, hang it on the beam adjacent to the live part of the working place, and stop. High voltage is dangerous! Sign Board. On the iron frame or ladder used by the staff to go up and down, it should be hung up and down from here! Signboard of. In the vicinity of other structures that may be boarded by mistake, no climbing should be hung, high pressure is dangerous! Signboard of

the temporary barrier can be made of dry wood, rubber or other tough insulating materials and should be installed firmly. It is strictly forbidden to move or remove temporary barriers and signboards during work

5. Live line work of electricians should be carried out by two or more people in coordination, one of whom should be the guardian, and the staff should obey the direction of the guardian

6. Electricians shall not erect bare conductors in the construction site

7. The terminal pole and corner pole of overhead line shall be repeatedly grounded. The lines shall be erected neatly and firmly, and shall not be bundled

8. When binding various insulated conductors, it is not allowed to use bare conductors, and it is not allowed to tie conductors to metal poles or metal scaffolds

9. Sheathed cables should be used for construction lighting and electrical equipment. It is strictly forbidden to use wires with unqualified and damaged skin, such as fancy wires and plastic flexible wires

10. The power distribution lines of fixed equipment on site shall not be laid along the ground, but shall be laid underground through pipes. There shall be no joints in the pipes, and the pipe orifice shall be sealed. Cable lines shall be buried at the specified depth

11. The installation and configuration of on-site distribution box and switch box shall comply with relevant regulations to ensure that one machine and one switch are on site

12. The voltage of traveling lights and sign lights for local lighting on site shall not exceed 36V. The voltage of lighting lamps working in particularly humid places, metal containers and metal pipes shall not exceed 12V. The portable lamp should use a covered lantern, and the cable should use a rubber sleeve cable

1 requirements for scratch resistance

13. High facilities on site must be equipped with lightning arresters as required

14. The electric welding machine should be equipped with an independent switch, and the machine shell should be connected to neutral or grounding protection. The length of the primary line should be less than 5m, the length of the secondary line should be less than 30m, the wiring on both sides should be crimped firmly, and a reliable protective cover should be installed. The welding handle wire should be in place with two lines. It is not allowed to use metal pipes, metal scaffolds, rails and structural reinforcement as the loop ground wire. The welding handle wire is free of damage and has good insulation

15. All mobile equipment or hand-held electric tools must be equipped with leakage protection devices, so that one machine has one switch, and it is strictly prohibited to use one switch for multiple purposes

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