grounding conducor size

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schiedjp

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#8 thhn copper wire,3 conductors, 3 phase, 208 volts in a 1 inch sch 40 pvc conduit,suppling 12 parking lot light poles. two heads per pole. 20 amp 3 pole breaker.wire length of run apx.1000'
question- can the grounding conductor be a #12 thhn? this is the present installation,and the engineer spec'ed ground rods at each pole. poles are fiberglass, heads are metal and transformer base,also metal.
 
Re: grounding conducor size

250.122(B) will require your equipment grounding conductors to be the same size as your ungrounded conductors. For example, if you pull #6 for voltage drop, you must also pull #6 on the equipment ground for the same reason--too much impedance on the conductor.
 
Re: grounding conducor size

The EGC must increase in size proportionately with the ungrounded conductors, see 250.122(B)

The ground rods will have no bearing on this.

Roger
 
Re: grounding conducor size

Hello Ryan, You beat me to it. :)

Roger
 
Re: grounding conducor size

Ryan, we are doing well, I hope You and Yours are too.

Roger
 
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