equipment grounding conductors [RE-wrenches]

[Drake Chamberlin]

Correction:

We size the wire for 125% short circuit current.

Drake 


Drake Chamberlin wrote:
> 
> Hello Wrenches, 
> 
> NEC 250.118 lists equipment grounding conductor types.  EMT is one type 
> of equipment grounding conductor that is listed.  
> 
> To be on the safe side, we usually run a wire in EMT, from the solar 
> array, that is rated at 125% of full load current per 690 requirements.  
> 
> 
> 
> The NEC Handbook gives some idea concerning what size that rigid metal 
> conduits are permitted for equipment grounding, for various amperages in 
> 
> feeders, although the NEC itself doesn't.  
> 
> In the past, I used EMT conduit to ground runs from solar arrays, the 
> same way that I use the pipe to ground other circuits.  Can we still use 
> 
> it?  What are the guidelines for determining what amperage or wire size 
> is allowed to be grounded in this way. 
> 
> Thanks,
> 
> Drake 


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