Temporary power supply 010: Remember the mandatory requirements for switch boxes
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According to the technical specifications for safety in temporary electrical use, the mandatory requirements regarding switch boxes are as follows: 1. Each electrical device must have its own dedicated switch box; it is strictly prohibited to use the same switch box to control two or more electrical devices (including sockets). 2. The electrical installation panel of the distribution box must be equipped with separate N-line terminal blocks and PE-line terminal blocks. The N-line terminal block must be insulated from the metal electrical mounting plate ； The PE wire terminal block must be electrically connected to the metal electrical mounting plate. The N wire in the incoming and outgoing lines must be connected through the N wire terminal block ； The PE wire must be connected through the PE wire terminal block. 3. The rated leakage operating current of the leakage protector in the switch box should not exceed 30mA, and the rated leakage operating time should not exceed 0.1s. Leakage protectors used in humid or corrosive environments should be splash-proof types, with a rated leakage operating current not exceeding 15mA and a rated leakage operating time not exceeding 0.1s. 4. Plugs and sockets must not be used for temporary connections at the power inlet ends of distribution boxes and switch boxes. 5. When performing regular maintenance and inspections on distribution boxes and switch boxes, it is necessary to disconnect the corresponding power isolation switch at the previous level in order to cut off the power supply. A sign reading “Do not close – work in progress” must be installed, and working on these devices while they are still powered is strictly prohibited. 6. Other general requirements for switch boxes can be found in the specifications of JGJ46-2005.
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The parts in bold in JGJ46 – thanks for sharing: lol
According to the temporary electrical safety technical specifications, the mandatory requirements for switch boxes include: each piece of equipment must have its own switch box; the distribution box must have separate terminal plates for the N and PE wires; leakage protectors must meet specific standards; the power supply inlet cannot be connected using plugs and sockets; regular power disconnection for maintenance is required, and safety signs must be installed. For other general requirements, refer to the relevant specifications. .
Just remember the 5-core wire; one switch per device is sufficient
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