How deep should a concealed electrical distribution box be
The depth of an electrical box determines how much internal volume is available for conductors, grounding bars, and other components. When building the wall, the reserved hole shall be about 20mm larger than the length and width of the distribution box. It takes the incoming power and safely distributes it to different circuits throughout your building. Boxes that enclose devices or utilization equipment supplied by 12 or 10 AWG conductors shall have an internal depth that is not less than 30.
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