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The surface mount outdoor electrical Distribution box is the central hub of the home circuit, and it is also the total control of our daily electricity consumption. It is a very important electrical equipment. If there are some safety hazards, we can deal with them in time, but many electrical beginners do not know much about power distribution. How to install and wire the box, the following editor will introduce the wiring method, installation method and size determination of the distribution box for your reference.
The general power distribution box incoming line adopts a five-wire system, that is, A, B, C three phase lines (generally yellow, green and red), one zero line (light blue), and one ground (yellow with green). stripe). Outlet as needed.
① 220V load generally takes one phase wire, one neutral wire, and one ground wire.
② 380V load, (such as 380V AC motor), take all three phases and add ground wire. (The neutral line is also required if the load has local control.)
③ There is a special two-phase 380V AC welding machine, which can produce two-phase phase wires at will. Add ground wire. The ground wire is generally required to be connected, but it is not connected in many occasions (such as construction sites). Generally, the incoming line is a three-phase incoming 3PIN air circuit breaker, circuit breaker, knife switch or other circuit breaker; the zero line is pressed to the zero terminal block, and the ground line is pressed to the ground terminal block. There are also incoming lines that directly use the 4PIN circuit breaker three-way phase line and the neutral line to enter the same line, and the grounding line is pressed to the grounding terminal block.
Lighting power distribution can use one phase line + one neutral line + one ground line according to the size of the load; or the above power distribution 220V.
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