Subpanel wiring

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billiards4me

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I'm working on a detached maintenance building at a subdivision. There is a pole mounted meter and panel. Out of that panel, previously was run 2 phases and 1 neutral, no ground. Direct burried approx 200' to the old maintenance building. The new building has been constructed an additional 80'+ further away. I tapped on to my 3-wire system and extended to my new panel in the building. I set a rod, and bonded the panel with the bonding screw (also bonded building steel, because it's a metal building.). Inspector came out and said that since this is a sub panel, it needs to be a 4-wire system from the original panel on the pole at the meter, and to take the bonding screw out of my new sub panel. I agree with most of this, although I thought I remembered something in the code where if the sub panel is not attached to the main building (in this case there is no main building, just a pole) and if it's more than 100' away, that you could run a 3-wire system to it, and re-establish a ground with your rod, and bond the panel. Can anyone please point me in the direction to find such code, or let me know if this is barking up the wrong tree? Thanks guys!
 
I think at one time there were some exceptions that allowed you to bond neutral to earth at both points under certain conditions, but this has since been removed from the code.
 
See 250.32 for your installation. Unless, you are still under the 2005 (or earlier) Code, you will be required to run an EGC with your feeder.
 
2002 NEC did not allow regrounding of the neutral if parallel paths were possible.
2008 NEC said never shall thy reground the neutral.
2011 NEC said it was allowed for existing installations, IE before 2008 and 2002 NEC.
Look at 250.32
Also with a 4 wire feed a grounding electrode system is required and has always been required.
 
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