250.32 (grounding cable w/ feeders to separate building

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charles1970

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waianaei, hi
If I am running feeders in pvc underground to a separate building is it necessary to install a grounding conductor? I say, 'no'. My colleague says, 'yes'. My reasoning is based around 250.32 and the principle of parallel paths for current to flow on what is supposed to be a non-current carrying conductor (the grounding conductor). If the conduit run were above ground in a continuous metallic raceway (rigid conduit) then 'yes' I would need the grounding conductor. The reason is that the concern for providing a path for arc fault overrides the concerns about any parallel paths to current created by the grounding conductor. Who is correct?
 
If your under the 2005 NEC or before you can choose to run an EGC or you can choose not to run an EGC if you comply with 250.32(B).

If your under the 2008 NEC you must run an EGC as 250.32(B) has been removed.
 
If you're running a metallic conduit the conduit can serve as the EGC so an extra EGC pulled within the conduit is not required. That would satisfy the new requirement of the 2008.
 
I would pull an EGC regardless of the code cycle. IMHO. Even with metal conduit.
 
John Valdes said:
I would pull an EGC regardless of the code cycle. IMHO. Even with metal conduit.
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So you don't ever install a service?

The concept of feeding a separate building using the grounded conductor as the grounding means is exactly the same as every service in the US.
 
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