2. Incoming wire: WDZ-BYJ-3* 16-MT32/CC, halogen-free low-smoke flame-retardant wire, specification 3* 16, passing through 32 thin-walled wire steel pipe, and CC (underground laying in the floor) should be WC (underground laying in the wall) or CC, WC.
3. Incoming circuit breaker: C50A/2P, type C (distribution type, short-time overcurrent 7~ 10In), 2 poles.
4. Neutral grounding rod: This box is equipped with neutral grounding rod N and grounding rod PE.
5. Outgoing: (Take W3 as an example) C 16A/2P, C-type circuit breaker 16A, 2-pole, with leakage tripping, with leakage current of 30mA；; ZRBV-3*2.5-PC25-WC/FC, that is, three 2.5-gauge flame-retardant wires, passed through 25PVC pipes and buried in the wall/underground.