Size of the hole under the distribution box
When the wall is built, the reserved hole shall be about 20 mm larger than the length and width of the distribution box. 1) Generally, the incoming line of power distribution box adopts five wire system, that is, a, B and C three-way phase line (the general color is yellow, green and red), one way zero line (the color is light blue) and one way ground line (the color is yellow with green stripes). It takes the incoming power and safely distributes it to different circuits throughout your building. Proper sizing of pull boxes is essential to ensure safe, code-compliant, and maintainable electrical installations.
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