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#48075 - 02/03/05 05:47 AM EGC sizeing
JCooper Offline
Member

Registered: 12/30/02
Posts: 229
Loc: Kendall Park, NJ USA
Hello all, I have an existing Infared electric heater installed, nameplate amps is 25, OCP 30 amps, fed with #8 THWN in 3/4" flex. I am adding another heater right next to this one and I just wanted to make sure that I can share the #8 EGC I pulled the first time, I will just be adding the two ungrounded conductors to feed the second unit in the same raceway. I looked in 250.122 and for 30 ocp the min EGC is #10, and for 60 amp, which would be the total amps drawn by both units the EGC is still #10 so my #8 should be fine, right? Thanks

Jim

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#48076 - 02/03/05 05:54 AM Re: EGC sizeing
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
The EGC should be sized dependant upon the breaker that it needs to trip. For the 30 amp, #10 is typically fine, however, you increased the size of the ungrounded conductors (for voltage drop?), and therefore the EGC must be increased in proportion, requiring a #8 EGC. It sounds to me like your EGC size will be fine.
_________________________
Ryan Jackson,
Salt Lake City

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#48077 - 02/03/05 06:25 PM Re: EGC sizeing
JCooper Offline
Member

Registered: 12/30/02
Posts: 229
Loc: Kendall Park, NJ USA
Sorry, I forgot to include that, the run is about 100' so I ran the #8 for VD. I thought the egc was alright, I just wanted to make sure I didn't miss something. Thanks

Jim

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