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Bonding Screw

8K views 10 replies 5 participants last post by  Nitwit 
#1 ·
Am I suppose to use this bonding screw? The paper work said "when required". Would it be ok to go ahead and use it? Thanks

 
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#2 · (Edited)
IF this is a service panel, then the bonding screw is required. If this is a sub-panel, then you don't use the bonding screw ... a separate equipment grounding bar is required.

I am more concerned with the use of a 60 Amp breaker on what appears to be a #10 conductor. Unless that is connected to a rather large A/C unit with similar specs on the nameplate, that would be a major code violation.

What is that 100 Amp breaker for? There are no wires connected to it. Is that for the incoming service from a meter box?

Edit to add: After looking at this again, it looks like a generator transfer switch panel? If that #10 is fed from a generator with proper overcurrent protection, then the 60 Amp breaker is fine. I would not use the bonding screw if this is the case.
 
#10 ·
somebody suggest before they might be protected at the generator properly. If so, the 60 amp rating becomes meaningless as they simply become a disconnect.

Obviously, if there is not proper protection at the generator, then yes, those wires are too small for the breaker.
 
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