Electrical options:
1) low-voltage power distribution design selected appliances should meet the following requirements:
1, the rated voltage of the electrical circuit should be adapted to the nominal voltage of the circuit;
2, the rated current of electrical appliances should not be less than the current calculation circuit;
3, the rated frequency of the electrical circuit should be adapted to the frequency of the circuit;
4, electrical appliances should be adapted to the environmental conditions of the place;
5, electrical appliances should meet the requirements of dynamic stability and thermal stability under short circuit conditions. Used to open the short-circuit current electrical appliances, should meet the short-circuit conditions on-off capability.
2) Check the electrical equipment in the short-circuit conditions on-off capability, the installation should be expected to short-circuit current periodic components of the effective value, when the short-circuit point connected to the motor rated current exceeds 1% of the short-circuit current should be included in the motor feedback Effect of current.
3) isolation of electrical installation
1, when maintenance, testing and maintenance equipment need to disconnect the power supply, should be set up isolation appliances.
2, isolated electrical appliances should be part of the loop and live isolated, when misoperation of electrical isolation can cause serious accidents, measures should be taken to prevent misuse.
3, isolated electrical appliances should be used at the same time disconnect all poles of the power switch or close to each other single pole switch.
4, isolated electrical appliances can use the following appliances: unipolar or multi-pole isolation switch , isolation plugs; plugs and sockets; connecting pieces; do not need to remove the wires of the special terminals; fuses. Semiconductor electrical appliances are strictly for isolation.
4) on-off current operation of electrical appliances can use the following:
1, load switch and circuit breaker ;
2, relays , contactors;
3, semiconductor electrical appliances;
4,10 A and below the plugs and sockets.
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