LOTO- Temporary electricity

LOTO- Temporary electricity

The setting of “one machine, one box, one switch, one leak” is not pressed for temporary power use

“One box, one machine, one switch, one leak” refers to the specification of temporary electricity, meaning that each mechanical equipment must have a separate switch box, the switch box should be installed knife switch (isolation switch) and leakage protector, a switch can only pipe one mechanical equipment, a switch is prone to misoperation and accidents. Such as in this accident, Gong and other operators in strict accordance with the “construction site temporary electricity safety technical specifications”, distribution box and switch box, in strict accordance with the “one box one machine one switch one leak” standard setting, will decorate the workers’ mechanical equipment and electrical equipment set separately, the accident can also be avoided.

Temporary power distribution box and switch box

According to Article 8.1 of Technical Specification for Temporary Electricity Safety on Construction Site, distribution box and switch box configuration must meet the following requirements: 1. Three – stage distribution system is adopted. The so-called three-level distribution is the total distribution, distribution, switch box three-level, three-level distribution, step-by-step protection, to “a machine, a gate, a leak, a box, a lock”.

Adopt TN-S zero protection system. TN-S zero connection protection system is 32 working zero line and protection zero connection protection system set separately. 3. Adopt secondary leakage protection. Secondary leakage protection means that the electrical system should at least be equipped with secondary protection of leakage protection in the main distribution box and switch box. The rated leakage action current and rated leakage action time of the secondary leakage protector in the main distribution box and switch box should be reasonably coordinated to form graded and sectional protection.