（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.
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.
Schematic diagram of switch box of large equipment such as ground pump and electrical system diagram of large equipment such as ground pump （2） The power switch box of tower crane and other equipment is set, and the configuration is the same as the schematic diagram of power switch box of tower crane and other equipment.
Schematic diagram of distribution box electrical connection diagram of distribution box electrical system diagram of distribution box Including schematic diagram of tower crane circuit distribution box (terminal board contact and electrical connection point diagram are the same as above) including system diagram of tower crane circuit distribution box (II) excluding lighting circuit distribution box, schematic diagram of 6-8 circuit distribution box ， 6 circuit distribution box including tower crane circuit (terminal board contact and electrical connection point diagram are the same as above) 8 circuit distribution box system diagram 6 circuit including tower crane circuit distribution box system diagram 4 switch box (set according to one machine, one switch, one leakage and one box) (I) kdm1 or DZ20 is set in the power switch box of large equipment such as ground pump (380V above 160A) series transparent molded case circuit breakers are used as control switches, and dz20l series transparent leakage circuit breakers or lbm-1 series leakage circuit breakers are configured; the PE line terminal block is 3 connecting bolts.
（4） Electrical components shall be products conforming to GB / 14048.2-2001, gb6829 and JGJ46-2005 standards, and meet the technical requirements for popularization and application of the Ministry of construction during the eleventh five year plan.
The product of rated leakage action current and rated leakage action time of leakage protection device shall not be greater than 30mA.
Schematic diagram of power switch box below 40a, terminal contact and electrical contact connection diagram of power switch box (IV) electrical system diagram of power switch box for equipment below 40A (IV) control switch and leakage circuit breaker are selected for switch box of electrical equipment above 5.5kW according to the rated capacity of controlled equipment.
The PE line and terminal board must be connected by electricity For gas 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 one is the connection point of repeated grounding.
At the same time, watt hour meter, voltmeter, ammeter and two groups of current mutual accumulators shall be equipped.
2 general distribution box (cabinet) is equipped with 400a-630a DZ20 transparent molded case circuit breaker with isolation function 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 is configured (DZ15L) transparent leakage switch or lbm-1 series shall be used as leakage protection device to have the functions of undervoltage, overload, short circuit, leakage and open phase protection.
1 basic requirements (I) the production and manufacture of the distribution box (cabinet) shall meet the special requirements and requirements for complete sets of equipment (ACS) for construction site in part IV gb7251.4 of low voltage switchgear and control equipment Technical code for safety of temporary electricity on construction site (JGJ46-2005).
The control switch is DZ20 (Se or kdm1) series transparent molded case circuit breaker, the leakage circuit breaker is DZ15L series transparent series leakage circuit breaker; there are 3 PE wire connecting bolts..
The thickness of the steel plate meets the jgj-2005 standard and is durable.
General distribution cabinet schematic diagram general distribution cabinet terminal board contact diagram general distribution cabinet door electrical connection point diagram four circuit distribution cabinet electrical system diagram six circuit distribution cabinet electrical system diagram eight circuit distribution cabinet electrical system diagram 3 distribution box (I) including lighting circuit distribution box (power circuit and lighting circuit are distributed separately) 200a-250a DZ20 series transparent molded case circuit breaker with isolation function is set as the main switch (adapted to the setting of circuit breaker in the main distribution box); DZ20 or KDM-1 transparent molded case circuit breaker is used as the power shunt and lighting shunt control switch; DZ20 or KDM-1 transparent molded case circuit breaker is used as the control switch for each distribution circuit; PE line connecting bolts and N line connecting bolts are configured according to the actual needs.
S.
The material selection, manufacturing technology, selection and configuration of electrical components in the distribution box (cabinet) and switch box should comply with relevant national standards and the Ministry of construction In accordance with the provisions of the Eleventh Five Year Plan for the promotion and application of technology, the products shall pass CCC certification.
(III) distribution box (cabinet) and switch box shall be provided with n-line and PE line terminal boards, and incoming and outgoing lines must be reliably connected through the terminal board.
Material: if there is infringement on Zhulong forum, Please contact us to delete this series of distribution boxes (cabinets) which are suitable for temporary power consumption at the construction site and outdoors and should meet the requirements of “three-level distribution, two-level leakage protection, one machine, one switch, one leakage and one box” distribution and protection.
The shell of the distribution box (cabinet) is made of cold-rolled steel plate, rainproof, dustproof and outdoor type.
The n-line 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.
It is best to select rated leakage action current 75- 150mA, rated leakage action time is greater than 0.1s and less than or equal to 0.2S, and its action time is delayed action type.
The system diagram of power switch box of tower crane and other equipment (III) the switch box of electrical equipment below 3.0kw is set with DZ20 (20-40a, 380V) or se, kdmi series transparent plastic shell circuit breaker as the control switch, and dz15le is configured (20-40a) or lbm1 series transparent leakage circuit breaker, the PE line terminal block is 4 connecting bolts.
