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1. The electrical distribution box should be equipped with power isolation, normal connection and breaking circuit, and short circuit, overload, leakage protection.
The total distribution box (distribution cabinet) consists of one incoming line unit and one outgoing line unit, or consists of one incoming line unit and several outgoing line units, transparent plastic case total breaker with visible break point and visible disconnection Point of the transparent plastic shell shunt circuit breaker and auxiliary power supply can automatically disconnect the auxiliary power type shunt leakage protector. Each circuit output should be equipped with three-point terminal board.
2. The total number of outbound loops of the total distribution box (distribution cabinet) is 1 to 5 loops.
3. Distribution box consists of an incoming unit and several outgoing units. Transparent plastic case breaker with visible break point and transparent molded case circuit breaker sub switch with visible break point and five terminal blocks board.
4. The number of distribution loops for the distribution box is 2 to 7 loops.
5. The switch box consists of a line-in unit and an outlet unit, with a transparent molded case circuit breaker and leakage protector and a five-point terminal board with visible disconnection points.
6. The transparent molded case circuit breakers at the visible disconnection points of the main distribution box (distribution cabinet), distribution box and switch box should all be set at the power input end.
7. The total distribution box should be installed with a voltmeter, total ammeter, and power meter. Ammeters and power meters must not share a current transformer. When the current transformer is installed, the secondary circuit must have a connection point with the protection neutral line, and the circuit must not be disconnected.
8. The rated leakage action current of the leakage protector in the total distribution box (distribution cabinet) shall be greater than 30mA, and the rated leakage action time shall be greater than 0.1S, but the product of the rated leakage action current and the rated leakage action time shall not exceed 30mA. ?S.
9. The rated leakage current of the leakage protector in the switch box should not exceed 30mA, and the rated leakage action time should not exceed 0.1S.
10. It is forbidden to use plugs and sockets to make active connections at the power inlet end of the distribution box and switch box.
11. Distribution box, switch box should have a name, use, shunt marking and system wiring diagram.
Explosion-proof distribution box installation requirements
With the rapid development of industries such as petroleum, chemical industry, military industry, engineering, factories, mines, and mining, explosion-proof distribution boxes are used more and more widely in production, storage, and rescue. How to prevent accidental explosion of the explosion-proof distribution box has become a very important issue in explosive gas hazardous locations. Since the explosion-proof distribution boxes inevitably generate sparks during their work, once they meet the explosive gas mixture at the production or rescue site, it will lead to an explosion accident, which will directly endanger the lives of national property and citizens. Therefore, as the most widely used lighting fixture, its explosion-proof technology has long attracted people's attention and great attention.