Building construction standard electric box

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Building construction standard electric box (complete set of equipment for construction site) ap-j main bus

Temporary power distribution box (cabinet) on the construction site

Ⅰ.Overview

This series of distribution boxes (cabinets) are suitable for temporary power consumption at the construction site and outdoors, and shall meet the use requirements of "three-level distribution, two-level leakage protection, one machine, one switch, one leakage and one box" distribution and protection. The material selection, manufacturing process, selection and configuration of electrical components in the distribution box (cabinet) and switch box shall comply with relevant national standards and the regulations of the Ministry of construction on the promotion and application technology in the eleventh five year plan, and the products shall pass CCC certification. The shell of the distribution box (cabinet) is made of cold-rolled steel plate, rainproof, dustproof and outdoor. The thickness of the steel plate meets the jgj-2005 standard and is durable.

Ⅱ.Basic Requirements

（1） The production and manufacture of distribution box (cabinet) shall comply with the special requirements of Part IV gb7251.4 of low voltage switchgear and control equipment for complete sets of equipment (ACS) on construction site and the standard requirements of technical code for safety of temporary electricity on construction site JGJ46-2005.

（2） The installation and use of distribution box (cabinet) and switch box shall meet the standardization requirements of technical code for safety of temporary electricity on construction site JGJ46-2005 and guide for safety of electricity use GB / t13869.

（3） The distribution box (cabinet) and switch box shall be provided with n-line and PE line terminal boards, and the incoming and outgoing lines must be reliably connected through the terminal board. The n-wire terminal board must be insulated from the metal electrical installation board; The PE line terminal board must be electrically connected with the metal electrical installation board. The n-line in the incoming and outgoing lines must be connected through the n-line terminal board; The PE line must be connected through the PE line terminal board. The connection between PE line and terminal board must adopt electrical connection. The number of electrical connection points shall be 2 more than the number of circuits in the box. One is the connection point of PE line into the box and the other is the connection point of repeated grounding.

（4） Electrical components shall be products that meet the standards of GB / 14048.2-2001, gb6829 and JGJ46-2005, and meet the technical requirements for popularization and application of the Ministry of construction in the eleventh five year plan.

Ⅲ.General distribution box (cabinet)

400a-630a DZ20 transparent molded case circuit breaker with isolation function is set inside as the main switch, and 4-8 circuits are set for shunt. DZ20 series 160a-250a transparent molded case circuit breaker with isolation function is adopted, and dz20l (DZ15L) transparent leakage switch or lbm-1 series are configured as leakage protection devices to provide undervoltage, overload, short circuit, leakage and open phase protection functions. At the same time, watt hour meter Voltmeter, ammeter and two groups of current mutual accumulators. The product of rated leakage action current and rated leakage action time of leakage protection device shall not be greater than 30mA. S. It is better to select the rated leakage action current of 75-150ma, the rated leakage action time is greater than 0.1s and less than or equal to 0.2S, and the action time is delayed action type.

Ⅳ.Distribution box

（1） Including lighting circuit distribution box (power circuit and lighting circuit shunt distribution)

A 200a-250a DZ20 series transparent molded case circuit breaker with isolation function is set as the main switch (suitable for the circuit breaker set in the shunt of the main distribution box); DZ20 or KDM-1 transparent molded case circuit breaker is used as power shunt and lighting shunt control switch; Each distribution circuit adopts DZ20 or KDM-1 transparent molded case circuit breaker as the control switch; PE line connecting bolts and N line connecting bolts shall be configured according to actual needs.

Switch box (set according to one machine, one switch, one leakage and one box)

（1） Power switch box of ground pump and other large equipment

Kdm1 or DZ20 (above 160A, 380V) series transparent molded case circuit breaker is set as the control switch, and dz20l series transparent leakage circuit breaker or lbm-1 series leakage circuit breaker is configured; The terminal block of PE line is 3 connecting bolts.

（2） The power switch box of tower crane and other equipment shall be equipped with the same configuration as above

（3） Switch box of electric equipment below 3.0kw

DZ20 (20-40a, 380V) or se, kdmi series transparent molded case circuit breaker is set as the control switch, dz15le (20-40a) or lbm1 series transparent leakage circuit breaker is configured, and the PE line terminal block is 4 connecting bolts.

（4） Switch box of electric equipment above 5.5kw

Select the control switch and leakage circuit breaker according to the rated capacity of the controlled equipment. The control switch is DZ20 (Se or kdm1) series transparent molded case circuit breaker, and the leakage circuit breaker is DZ15L series transparent leakage circuit breaker; There are 3 PE wire connecting bolts.

（5） Lighting switch box

It is equipped with kdm1-t / 2 (20-40a) circuit breaker, dz15l-20-40 / 290 leakage circuit breaker and 3 PE line bolts.

Note: the leakage circuit breaker in the switch box must select products with rated leakage action current not greater than 30mA, rated leakage action time not greater than 0.1s, current quick break and electromagnetic motor guarantee.

The leakage circuit breaker in the main distribution box shall be products for distribution protection.

Ⅴ.The layout of distribution room shall meet the following requirements

（1） The width of the operation channel on the front of the distribution cabinet shall not be less than 1.5m for single row arrangement or double row back-to-back arrangement, and not less than 2m for double row face-to-face arrangement;

（2） The width of maintenance channel behind the distribution cabinet shall not be less than 0.8m for single row arrangement or double row face-to-face arrangement, and not less than 1.5m for double row back-to-back arrangement. If there are protruding places of building structure in some places, the channel width at this point can be reduced by 0.2m;

（3） The width of maintenance channel on the side of distribution cabinet shall not be less than 1m;

（4） The distance between the ceiling of the distribution room and the ground shall not be less than 3m.

Ⅵ. The erection of distribution box shall meet the following requirements

（1） The vertical distance between the center point of fixed distribution box and switch box and the ground is 1.4-1.6m. The vertical distance between the mobile box and the ground is 0.8-1.6m. The distribution box and switch box shall be installed on a firm and stable support.

（2） If the distribution box and switch box are within the falling radius of the building or the rotation radius of the tower crane arm, a double-layer protective shed must be built, and isolation measures must be taken.