1, L fire line, N zero line, ground line hole, must be one-to-one correspondence, so as to avoid the danger of short circuit.

2. The screws in the wiring holes must be tightened to reduce the safety hazards such as poor contact.

3. If there are conditions to select a special connecting wire as much as possible, its two ends are electroplated cold indenters, which have the advantages of large interception flow and oxidation resistance.