Normally, it is enough to calculate the current pairing according to the power of the explosion-proof lamp. Divide the power of the explosion-proof lamp by 220V to calculate the corresponding rated current, and then refer to the load current value of the wire to find the corresponding wire square;

For example, 1 square copper core wire can pass 6A current, that is, 6A*220V=1320W. If the lamp power is less than 1320W, 1 square pure copper wire can be used. However, considering the aging of wires, heat generation and other issues in dangerous places, to The small ones use 1.5 square meters.

Wire load current value specified in GB4706.1-1992/1998 (part)

1 square copper core wire allows long-term load current: 6A---8A

1.5 square copper core wire allows long-term load current: 8A---15A

2.5 square copper core wire allows long-term load current: 16A---25A

4 square copper core wire allows long-term load current: 25A---32A

6 square copper core wire allows long-term load current: 32A---40A