Posted by gbs on January 13, 2023 at 20:22:27 from (71.217.169.27):
even though several electricians have explained to me i can't seem to understand the purpose of the green bonding screw being used or not in a single phase 220 volt electrical panel box when followed by a sub panel. i know it's suppose to connect the neutral and equipment grd bars to the panel box there by creating equal potential of the metal box and the bars. what i can't grasp is the service neutral wire that comes from the transformer is bonded to the system neutral which is a grounding system that also has a ground rod at the pole, then that it is connected to the meter back thru it to the main panel neutral bar which has a driven ground rod connect to it, also the neutral bar is mounted directly to the box with screws as well as the equipment ground bar is screwed to the box if not mounted to the neutral bar itself . so what is the need of the green screw and the second extra coated ground wire between the boxes when they are already bonded as described?
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