1. First of all, the type of wire, such as ZR, is flame retardant. Secondly, the cross section and the number of wires. For example, 5X6 means that five wires (three live wires, one zero wire and one bottom wire/protective zero wire) are 6 square wires (the cross section is 6 square millimeters, and wires with different cross sections are selected according to the load calculation current), and PVC20 means that the wires pass through a PVC pipe with a diameter of 20 millimeters. The distribution box wire can be PC or PVC, and other metal pipes such as SC can also be used. In addition, there is no laying method in the drawing.

W5/W6, etc. stand for wire5 wire6, which is a cyclic number.

2. In the figure below, 40A/3P represents the use of a 3-switch 40A circuit breaker to protect three live wires. This line is a three-phase circuit, which should be a special circuit for high-power electrical appliances (such as air conditioners above 5P). The following 16A/2P is a single-phase three-wire loop, which should be a general socket loop.

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