The installation spacing of electrical appliances is too small.
B.
The total distribution box is required to be greater than 30mA, greater than 0.1s, but the product should not be greater than 30mA ยท S.) A.
Distribution box number and electrician certificate.
Equipment or facilities shall be provided with lightning protection measures.
there is no box door jumper, and the box door jumper material is wrong.
F.
Common problems to be prevented for temporary power use A.
C.
One switch has many machines.
Leakage protector electrician should check the distribution box, leakage protector and line every day.
The leakage protection parameters are inconsistent (the rated leakage action current of the leakage protector in the switch box should not be greater than 30mA, and the rated leakage action time should not be greater than 0.1s.
The construction organization design of temporary power utilization shall be in accordance with the technical code for safety of temporary power utilization on construction site: if there are 5 or more temporary power utilization equipment or the total capacity of the equipment is 50KW or more, the construction organization design of temporary power utilization shall be prepared.
After the approval of the temporary power construction organization design, the secondary protection of level 2 and level 3 distribution shall be implemented, so that the level 1 and level 3 distribution boxes are equipped with leakage protectors; The three-level distribution box should have one machine, one box, one switch, one lock and one leakage protection.
D.
The incoming and outgoing lines are not equipped with insulating sheath and are clamped on the box in bundles, which are in direct contact with the box.
Make daily inspection records (measurement records of grounding resistance, insulation resistance and leakage action parameters of leakage protector).
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The disconnector has no visual breakpoint.
PE line is not connected.
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The construction organization design of temporary power utilization must be prepared by the technical personnel of electrical engineering, reviewed by the technical director, and implemented after being approved by the competent department.
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Power switch box and lighting switch box are not set separately.
1.
Illegal use of reverse switches, knife switches and other national obsolete equipment.
C.
The daily management data of temporary electricity shall be reviewed and approved by the project manager every week.
Distribution boxes at all levels of the construction site should be numbered, clearly marked and locked.
Electricians must work with certificates; The safety hazards found in the patrol shall be reported to the safety director in time, and the person in charge shall take corresponding measures in time.
B.
E.
Distribution box signboard 6.
Level III distribution level II protection 3.
Distribution box grounding protection tower crane, scaffold lightning protection grounding distribution box grounding facilities 4.
Electrician inspection records professional electricians check every day.
5.
The distance between the distribution box and the switch box exceeds 30m, and the horizontal distance between the switch box and the electrical equipment exceeds 3M.
