(1) Basic requirements
1.1 Each household shall be equipped with a separate distribution box. The leakage circuit breaker shall be provided in the distribution box. The leakage current shall not exceed 30mA. There shall be overload and overvoltage protection functions, and the points shall be routed out to control the lighting, air conditioning, sockets, etc. respectively. The loop should ensure the normal use of the load.
1.2 The laying of conductors shall be carried out in accordance with the decorative design provisions. Short-circuit protection, overload protection, selection of conductor cross-sections, and installation of low-voltage electrical installations shall be carried out in accordance with current national standards and relevant regulations of Shanghai.
1.3 The indoor wiring shall be laid through pipes in addition to the hollow floor, and a well-insulated single-stranded copper conductor shall be used. When laying through pipes, the total cross-sectional area of ​​the conductors in the pipe shall not exceed 40% of the cross-sectional area of ​​the pipe's inner diameter. There shall be no joints or kinks in the pipe. Wires and telephone lines, closed-circuit television lines, communication lines, etc. must not be installed in the same pipeline.
1.4 The cross section of the lighting and electric heating load shall be selected so that the safe ampacity of the conductor is not greater than the sum of the rated currents of all the electrical appliances in the branch, and the capacity of each sub-route shall not exceed the capacity of the incoming line.
1.5 The grounding protection shall be reliable, and the insulation resistance between the conductors and between conductors shall be greater than 0.5MΩ.
1.6 The thickness of the wall of the PVC plastic conduit for entering a household shall not be less than 1.2mm.
1.7 The heater installation shall not use ordinary sockets and shall not be directly installed on combustible components. Bathroom sockets should be splashproof.
1.8 The outlet should not be less than 200mm from the ground. There should be a margin in the wire inside the box, and the length should be 150mm. When the wiring phase into the switch, the zero line directly into the lamp, screw mouth lamp phase line should not be connected to the shell, the lamp opening distance from the ground should be 1.3mm, the switch should not be installed after the door.
1.9 The electrical piping in the flat top shall be in accordance with the requirements of the open piping and the piping shall not be fixed to the flat top hanger or keel. The configuration of the lamp box and junction box should be easy to repair and cover plate. If the hose is used to receive the lamp, its length should not exceed 1m. Hose applications at both ends of the dedicated connector and junction box, lighting fixtures. The metal hose itself should be grounded. All kinds of strong and weak wires must not be exposed in the ceiling.
(2) Acceptance requirements and methods
2.1 After completion of the project, the owner shall be provided with the dimension drawing of the line going to the location and shall be checked and accepted one by one according to the above requirements. The concealed electrical line shall be concealed after the acceptance of the owner.
2.2 The phase line and neutral position facing the power socket shall be left-to-left and left-zero, and the socket with grounding hole shall have the ground socket as the upper position, and the grounding shall be reliable. The switch socket should be firmly installed. Visual inspection and manual methods are used to check, and special tools for circuit testing are used to verify that the phase, neutral, and ground positions on the socket meet the requirements.
2.3 The separation distance between the wire and the gas pipeline shall be as specified in Table 1 and checked with a steel tape measure.
Table 1 Distance between conductor and gas pipeline mm
Category Location Wire and gas pipe distance between electrical switch connector and gas pipe
Same plane ≥100≥150
Different planes ≥50
2.4 After the construction is completed, electric power supply and lighting test test should be performed to verify whether the performance of switches and sockets is good. Electrical acceptance criteria analysis:
Wires should be installed safely. Each household should be equipped with a separate distribution box, be sure to install a grounding line, leakage circuit breakers should be set within the distribution box, leakage current should not exceed 30MA, there is overload, over-voltage protection, and the score of the road, control lighting , air conditioners, sockets, etc., the loop should ensure normal use of the load. The thickness of the PVC plastic conduit for the household shall not be less than 1.2 mm. The conductors and telephone lines, closed-circuit television lines and communication lines shall not be installed in the same pipeline. The total cross-sectional area of ​​the conductors in the pipe shall not exceed 40% of the cross-sectional area of ​​the inner diameter of the pipe. There shall be no joints or kinks in the pipe. The outlet should not be less than 200 mm from the ground. There should be a margin in the wire inside the box, and the length should be 150 mm. Phase line into the switch, the zero line directly into the lamp. The phase line and neutral position facing the power socket are left-to-right and left-zero, and the ground socket has a grounding hole. The ground socket should be the upper position. The concealed electrical circuits should be accepted before they can be concealed.
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