Neutral Bonding

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indy1808

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On site we do lots of temporary setups for shows & etc. This building is 40 years old & as such the distribution has no grounds other than the conduits. When I set up a temporary 12 circuit 100amp 208v 3 phase Panel for use, it is done with 20 amp receptacles mounted on the panel. A 6/4 cable is plugged into a 70 amp 3phase 208v disconnect which in turn feeds the panel. Should the panel be bonded at the neutral since there is no ground for the safest application? Rather than running a separate ground wire with it & tied to what? the disconnect? Do you understand my dilemma?
 
Re: Neutral Bonding

A 6/4 cable is plugged into a 70 amp 3phase 208v disconnect which in turn feeds the panel.
How is this done what are you not hooking up?

3 ungrounded conductors

1 Grounded conductor

1 Grounding conductor

Are you sure you do not have 6/5 cable?

That aside do not bond this temp panel, that would be a violation, use the conduits as the grounding means that was, and still is a acceptable grounding method.
 
Re: Neutral Bonding

you should set up a new temp wire 6/5 that you have a ground . Ground wire has to run with the other conductors not separate.
 
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