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pole barn sub panel
I am in Ky and wired my pole barn in 2004. The inspector told me to run two hot and one neutral to the barn to a panel with a 100amp breaker that feeds a box for 8 breakers. He said I do not need a bare ground wire with the service line to the barn nor a grnd rod to ground the service at the barn. The service is set up with an isolated neutral and the bare wires grounded to the breaker boxes. The two breaker boxes are bolted and grounded to each other. Ky addopted the 2005 NEC code in 2005 so it may be different now. I am going to ask around and see if I need a ground rod and any changes to the way it is hooked up. I am very currious and interested about this now.
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pole barn sub panel
Eric, today I revisited the NEC article and found how to see the figures/diagrams 1,2,and 3. I printed out 2 and 3 and found that my installation is figure 3. However, I have two ground fault circuits for elec. outlets and the text said without ground fault circuits. What I have is a 400Amp service split to 200Amp each to home and shop. I was required to use a 400A meter base with two trailer disconnects of 200A each. One for the house and one for the shop/garage. The ground buss and neutral buss are bonded and grounded to the meter base. The #4 bare runs into the house and shop service panels unbroken from ground rod to meter base, to trailer disconnects,to each service panel. The neutral buss in the house and shop is isolated from the ground as required locally. At the trailer disconnect that supplies the pole barn I have a 100A breaker and three wires(two hot, one neutral)to supply the pole barn in PVC undrground. At the pole barn I have two breaker boxes bolted and bonded together. One has a 100A breaker as a main disconnect, the other has places for 8 breakers. The neutral is isolated and the ground is bonded to the panel boxes with no ground rod. Now, if I install a ground rod and wire it to the ground buss do I also need to bond the neutral? Or, since I have ground fault circuits need to keep the neutral isolated?
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pole barn sub panel
Thanks for that site Eric. It is a GOLD MINE of info. I joined and put a thread on the question I asked of you. I am just making sure the inspector told me right. I do want to be protected.
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pole barn sub panel
My service panels ARE grounded to the ground rod. The inspector wanted me to put one ground rod in at the meter base. Then run one continious #4 bare copper wire folded in half from the ground rod to the meter base ground lug. Then one of the wires went to the left side house trailer disconnect ground lug and through the conduit into the house service panel ground lug. The other wire went to the right side shop/garage trailer disconnect ground lug and then to the shop/garage service panel ground lug. He did not want the neutral bonded to ground. That is how the inspector wanted it. That was using 2002 Ky elec. code. What I am trying to find out now is do I need a ground rod at the pole barn and how to hook it up. The inspector told me no when I was putting it in. The electrician I work for said it needs a ground rod. I am searching for the current code as to how it should be hooked up. But, I have been told several ways to do it. Now, which one is right, that is the question. What I need to do is find a code book and read it and ask the power co. field man here about it.
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pole barn sub panel
kw, that is part of the problem. It's all in and inspected so I don't have to go through him again. Just reading the posts here got me to thinking, maybe mine needs a ground rod at the barn to be safe and how to connect it. I guess I am going to have to find a copy of the 2005 NEC and read it for myself. According to the NEC article on sub panels in outbuildings that is in a post in this thread If you run a 4 wire system, 2 hot, 1 neutral, one ground, then you need a ground rod at the barn wired to the ground buss and the neutral is not bonded to the panel. If you run a three wire system, 2 hot, 1 neutral, then you need a ground rod wired to the ground buss and the neutral is bonded to the panel. I guess I am just trying to confirm this info before I make the changes. Maybe I am just beating a dead horse but I want to be sure it's correct.
edit: at $50 a copy from Amazon I don't think I'll buy a copy of the 2005 NEC.
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Well, I will take you up on that offer. I think my email it accesable in my profile. When you get the book email me and I will email you to see if you can find the section pertaining to the outbuildings.
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