Selection of busbar current carrying
（GB12681-81）The color of the wires in the electrical equipment: A, yellow; B, green; C, red. Neutral or neutral light blue, yellow and green two-color wires for safety ground; DC, positive brown; negative blue; ground neutral with light blue, the arrangement of busbars, AC vertical, A, B, C, N; top, center, bottom, bottom, horizontal; left, center, right, right, front and back; far, center, near, nearest, DC; positive and negative vertical; top and bottom, horizontal, left and right, front and back, Arranged far and near, special treatment in special cases, you can reverse the phase. The busbar bending should be less than 90° as much as possible.
The overlap of the three busbars should be branched back and forth and the main is middle. The selected screws must be matched, and the punching of the bus bar should be made according to the requirements of the relevant process codes. The selection of busbar current carrying capacity is based on empirical calculations. Aluminum below 600A (including 600A) is 3A; copper is 5A (square millimeters). The discharge capacity of copper wire is 1.3 times that of aluminum.
Empirical formula: busbar thickness × coefficient
Such as:40×4＝40×12＝480A copper×1.3, 480A×1.3＝624
Relevant model equipment meaning:
Low pressure BSL: B means low pressure; S means double-sided maintenance; L means power. GGD: G1 stands for AC low-voltage distribution panel; G2 stands for component fixing and fixed wiring; D stands for power cabinet.
Power box XL-10, X-box structure; L-power distribution; F-dustproof; M-lighting; R-embedded; W-outdoor.
GG-1A, GG: fixed high-voltage switchgear.
XGN: X—Box-type switchgear; G—Fixed; N—Indoor device.