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Twinkles69

02:25PM | 11/01/07
Member Since: 10/31/07
1 lifetime posts
Bvelectrical
A relative (Luke) is wiring a shed in the country. The power co brought the power to the pole and Luke ran the power from that box (at the meter) underground to the shed where it terminates at a box with breakers. My concern relates to the fact that there is only a single buss bar in that box in the shed. He has both the nuetrals and grounds (from the outlets) hooked up to the same bar, several of them in the same holes. I don't know much about eletrical but didn't think that that was right. Should there be a second bar so that you can separate the grounds from nuetrals? Should that second box on the shed be grounded via a grounding rod? I could use any help....

Billhart

04:29PM | 11/01/07
Member Since: 04/25/05
1916 lifetime posts
"The power co brought the power to the pole and Luke ran the power from that box (at the meter) underground to the shed where it terminates at a box with breakers."

I am not sure what you are describing, but I am guessing that it a farm style central metering where the power is droped in a pole in the yard and the meter is there. And from that pole there are feeds to other buildings. Compared to a typical home with outbuildings where the drop is to the home and then feeds to sub-panels in outbuildings.

I am not that familar with farm style central metering. But here is the basic concept with power to outbuildings.

If the outbuilding does not have a metallic connection (ie, metal water pipe or cable TV or similar) the it can be wires with a 3 wire connection (2 hots and a neutral). The panel is treated as a service entrance with the neutral bus bonded to the case and ground electrode conductor.

In that case there is no separate neutral and ground bus. They are all one in the same.

In any case a ground electrode system needs to be installed at the building. Most commonly a pair of ground rods unless a ufer ground (uses rebar in concrete footers) is used.

"He has both the nuetrals and grounds (from the outlets) hooked up to the same bar, several of them in the same holes."

A terminal with a neutral connection can not have another wire in it. That has been true for a while, but the wording was such as people also put a ground wire in the same hole. The latest code has made it clear that NOTHING else can be in the hole if it has a neutral wire in it.

However, if the panel label allows you can have multiple ground wires in one hole.
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