Grounding of metal conduit in distribution box
To safely ground a metal box, connect an equipment grounding conductor (typically a bare or green insulated wire) from the box to the main electrical panel's ground bus bar. Understanding how to ground metal electrical box components is not just about following code—it's about protecting your home and family. 7 Provide conduit grounding bushings, bonded together and connected to the equipment enclosure on all incoming and outgoing conduits on distribution switchgear and switchboards, distribution panels and on all conduits over 1-1/4" diameter at all panelboards, pull boxes and equipment. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used.
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