The distribution box manufacturer will tell you the installation specifications and wiring safety matters of the distribution box:
1、 Regulations before application:
1. The distribution cabinet and distribution box shall have name, main purpose, separate identification and system software wiring method.
2. The doors of the distribution cabinet and distribution box shall be equipped with keys and shall be undertaken by full-time personnel.
3. The distribution cabinet and distribution box shall be regularly maintained and overhauled. Inspection and maintenance personnel must be professional electricians. During inspection and maintenance, insulating safety shoes and rubber gloves must be worn according to the regulations. Insulating tools of electric welders must be used, and inspection and maintenance logs shall be kept.
4. When carrying out regular maintenance and inspection on the distribution cabinet and distribution box, it is necessary to close the power supply of the corresponding high-voltage disconnector of the previous level, and hang the power-off signboard "no reclosing, some people are working" to prohibit electricians from working.
5. The distribution cabinet and distribution box must be operated in the following order:
(1) The actual operation sequence of closing is: general distribution cabinet → distribution box → switch box;
(2) The actual operation sequence of power off is: distribution box → distribution cabinet → general distribution box. However, in case of common failure of electrical equipment, the emergency can be excluded
6. When the work on the construction site is terminated for more than 1h, the driving power distribution box shall be turned off and locked.
7. The employees using the distribution box must meet the requirements of article 3.2.3.
8. The power distribution cabinet and distribution box shall not be allowed to place any dirt, and shall be kept clean and tidy.
9. It is not allowed to build other power consuming machines and equipment in the distribution cabinet and distribution box.
10. The configuration and wiring of household appliances in the distribution cabinet and distribution box shall not be modified arbitrarily. When disassembling and replacing the solution of the circuit breaker, it is prohibited to select the solution that does not conform to the original size. Before the leakage protection switch is used every day, the technical button of the running test shall be operated for a test jump. If the test jump is abnormal, it is prohibited to apply it again.
11. The incoming line and outgoing line of the distribution cabinet and distribution box shall not bear external force, and shall not touch the sharp fracture surface of metal materials, strong corrosive media and inflammables and explosives.
Temporary power level I distribution box, level II distribution box, things and regulations stored in level III distribution box
In order to implement the technical code for safety of temporary power use on construction site (JGJ46-2005) issued by the Ministry of construction, further standardize the temporary power distribution cabinet and distribution box (ACS) for construction in this city, ensure the safe use of power on construction site, avoid leakage and electrical fire safety accidents, and integrate local specific conditions, these rules are formulated.
2、 Setting of distribution cabinet and distribution box
1. The power distribution system at the construction site shall be equipped with the general distribution cabinet (distribution box), the distribution cabinet and the distribution box to implement three-level power distribution and two-level leakage protector.
2. Several distribution cabinets can be set under the general distribution cabinet (distribution box), and multiple distribution boxes can be set under the distribution box.
3. The distribution cabinet and distribution box shall be made of cold-rolled plate with the thickness of stainless steel of 1.2 ~ 2.0mm. The thickness of stainless steel of the distribution box shell shall not be less than 1.2mm, and the thickness of stainless steel of the distribution box shell shall not be less than 1.5mm. The cabinet door shall be provided with structural columns, and the surface layer of the shell shall be protected against corrosion. The safe distance between the positioning point of mobile distribution cabinet and distribution box and the road surface shall be 1.4 ~ 1.6m. The mobile distribution cabinet and distribution box shall be placed on a firm and stable support frame. The safe distance between the positioning point and the pavement should be 0.8 ~ 1.6m.
4. The household appliances (including power sockets) in the distribution cabinet and distribution box shall be screwed on the metal household appliance assembly board without tilting and loosening, and then they can be fixed in the distribution cabinet and distribution box. The assembly method of electrical equipment beam can also be used for the general distribution cabinet (distribution box). The metal household appliance assembly plate and the metal shell shall be electrically connected.
5. Copper core insulated conductor must be used for connection of distribution cabinet and distribution box. The hue of the transmission line shall be: the hue of the live line zero line L1 (a), L2 (b) and L3 (c) shall be yellow, green and bright red successively; The color of N line is light blue; The color of PE line is green and yellow. The transmission lines shall be arranged in a neat manner. The connection heads of the transmission lines shall not be riveted with anchor bolts. Instead, they shall be welded by electric welding and bound with insulating layers. No part of the power supply shall be exposed.
6. The distribution cabinet and distribution box must be equipped with n-line terminal (row) and PE line terminal (row). The n-line terminal (row) must be insulated with the metal material household appliance assembly board, and the PE line terminal (row) must be electrically connected with the metal material household appliance assembly board. The wiring level of n-line terminal block and PE line terminal block of general distribution cabinet (cabinet) shall be n + 1 (n-return circuit of distribution cabinet); There are at least two wiring levels of n-wire terminal strip and PE terminal strip of distribution cabinet; The distribution box shall be provided with n-line terminal and PE line terminal.
7. The metal material body of the distribution cabinet and distribution box, the metal household appliance assembly board and the metal material base and shell of the household appliance that are normally not powered need to be electrically connected with the PE line through the PE line terminal board. The metal material cabinet door and the metal material shell need to be electrically connected with soft copper core wire.
8. The spacing of electrical components on the assembly board of household appliances in the distribution cabinet and distribution box shall not be less than 80mm in the vertical direction; The horizontal direction shall not be less than 20mm.
9. The import and export trade of the power transmission lines of the distribution cabinet and distribution box shall be built at the bottom of the shell. The inlet and outlet connection holes must be maintained with plastic wire protection rings for insulation layer. The inlet and outlet lines cannot be in direct contact with the shell; The bearing beam of the box support frame shall be embedded with fixed holes for the incoming and outgoing lines.
10. The appearance design and structure of the distribution cabinet and distribution box shall be waterproof, rainproof and antifouling. The waterproof level shall not be less than IP21 when the door is opened and not less than IP44 when the store is closed.
3、 Selection and allocation of electrical components
1. The household appliances in the main distribution cabinet shall have switching power supply protection, normal access and disconnection of power supply circuit, and short-circuit fault, load and leakage protector.
The general distribution cabinet (distribution box) is composed of a three-phase five wire module and a group outgoing module, or a three-phase five wire module and a plurality of group outgoing modules. It is arranged with the full transparent plastic shell general disconnector with the breaking point visible from this, the full transparent plastic shell separate disconnector with the breaking point visible from this, and the auxiliary switching power supply type separate leakage protection switch that can be disconnected automatically in case of common failure of the auxiliary switching power supply. Three point terminal block shall be arranged at the leading end of each control circuit.
2. There are 1 ~ 5 control circuits for the distribution circuit of the main distribution cabinet (distribution box).
3. The distribution cabinet is composed of a three-phase five wire module and a plurality of group outgoing modules. The main switch of the fully transparent molded case circuit breaker with the breaking point visible from this, the sub power switch of the fully transparent molded case circuit breaker with the breaking point visible from this and the five point wiring terminal block are arranged.