e said: (quoted from post at 13:21:59 12/03/09) To give you guys some background, I'm upgrading the electrical service on our farm to 400 amp. The current system comes in to a central pole, then branches out to each building. The new system will be underground and will come into the shop. From the shop, I will be running from one main panel to the barn, house, etc.
What I'm trying to determine is if I should have grounding rods for each building, or, should I run two hots, a nuetral, and a ground from each building to the main panel. My plan has been to ground each building seperatly with two 5/8" 8' rods etc etc. It feels better to me to ground as close to the point of use as possible. The distance I need to run from the main panel to each building is about 150'.
Now my other question pertains to grounding the barn. Do I need to give any special consideration to grounding a building with livestock? Would it be better to run a ground back to the main panel to minimize the potential for stray voltage?
you ask, "Would it be better to run a ground back to the main panel to minimize the potential for stray voltage?"
You can do that. The NEC has several instances of info on this topic & one must take care not to mis-apply any one instance to the wrong situation......it can be confusing.
Keep this all important over-riding statement in mind when setting up your grounding scheme: "Never create a situation where neutral load current is allowed to flow in the safety ground conductor."
How does that apply to your question, you might ask?
IF you choose to run both a safety ground & a neutral to your livestock barn, then to avoid having neutral load currents flowing in your safety ground, the two 'grounds' (neutral & safety) MUST be separated at the barn. Note, since they are common at the service entrance panel, if they were to be tied together (common) at the barn, now the neutral conductor and the safety ground conductors would simply be in parallel (essentially one conductor composed of 2 strands)...no good!
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