Re: Electrical power to pole shed

Posted by John T on September 06, 2006 at 06:35:17 from (66.244.90.5):

In Reply to: Electrical power to pole shed posted by Nick R (Wi) on September 06, 2006 at 05:56:44:

Nick, based upon what you say, it appears at the existing 100 amp service disconnect you described the Neutral is bonded to a grounding electrode (the driven earth ground rod) and the Equipment Ground Buss. If such be the case, whenever you provide feeders to a "Sub Panel" out of such a panel, you DO NOT bond the Neutral Buss and the Equipment Ground Buss again at the "Sub Panel". The Sub Panel would have seperate and isolated Neutral and Ground Busses that ARE NOT bonded together like at the Main Service Entrance Panel.

That means you would run 4 wires to the Sub Panel (if you want both legs of 120 as you stated) being 2 Hots (L1 & L2 Red & Black),,,,, a Neutral (White Grounded Conductor) and an Equipment Ground (Green or Bare Grounding Conductor).

If you plan to direct bury it simply use type UF (Underground Feeder) wire. Since the run is 110 feet and you wanna use 20 amp branch circuits, I would use 10 Gauge Wire minimum to lessen voltage drop, that would be 10/3 with ground (4 conductor) Type UF Cable.

Sooooooooooo to answer your question NOOOOOOO you DO NOT use another ground rod at the shed and there at that Sub Panel you have seperate and isolated Neutral and Equipment Ground Busses.

Note, there are NEC exceptions as far as sub services to agricultural and outbuildings and additional grounding electrodes such as driven rods etc whereby you might get by with running 3 instead of 4 conductors, it has to do with maintaining the Equipment Ground Buss at the same potential as mother earth so when Bossy the cows nose touches the bonded to Equipment Ground Buss metal frame of say an automatic waterer, its potential is the same as mother earth so she dont get a shock.

DISCLAIMER Im long retired as an Electrical Engineer and am NOT up on the NEC as I once was and not familiar with the exceptions regarding service to sub panels for agricultural or remote outbuildings whereby you might get by running 3 versus 4 conductors to the remote location and re establshing another grounding electrode such as another driven ground rod etc as you asked,,,,,,,, soooooooooooo you best check with your local building authority or agency as many of these practices are governed not only by the NEC but by the local governments and electrical inspectors etc.

PS At your existing Main Service Panel you would serve the Sub Panel with a 2 pole 240 volt (tied) 20 amp circuit breaker, that way if one leg would have a fault, the breakers tripping would cut power to BOTH legs L1 & L2.

Best wishes n God Bless

John T (Long retired and NEC rusty EE)

Replies:

• Re: Electrical power to pole shed buickanddeere 16:06:19 09/06/06 (0)
• Re: Electrical power to pole shed paul 10:55:34 09/06/06 (1)
  • Re: Electrical power to pole shed John T 11:15:43 09/06/06 (0)

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