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Discussion Boards > Active Subjects > Messages as Posted > Electric Forum

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12-15-2005, 16:49

Post: 121135

Wen

Join Date: Jun 1999
Location: Texas
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

Posts: 10

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pole barn sub panel

You should run a fourth wire (also #8) for the ground wire. Since the 30 amp circuit normally will be used to power other 15 or 20 amp circuits, a small 4 - 8 circuit breaker panel (without a main breaker is about $15 (plus $3/breaker) is required at the barn. It is also necessary to have a separate ground buss (normally purchased separately from the panel) for all ground returns. It is never permitted to use the neutral and ground busses tied together in a sub panel such as you are installing. Barn circuits should be protected by 15A or 20A GFCI circuits ($10) unless they are for (and ONLY for) dedicated fixed equipment. It is not expensive to conform to the NEC and much safer for everyone. The breakers allow you to turn off each circuit and the 30A breaker in the main panel allows you to disable the entire sub-panel in the barn. The correct wiring of ground and neutral wires allows the GFCI protectors to prevent shocks with nearby water and wet soil or concrete and are required.

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12-15-2005, 21:39

Post: 121144

Wen

Join Date: Jun 1999
Location: Texas
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

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pole barn sub panel

The reason the NEC was changed was to be certain that ground fault interrupt devices would operate properly from sub-panel circuits and to prevent poor bonding to the neutral wire which can easily create a shock hazzard in damp locations. This separates the requirements for grounding and bonding at sub-panels. Metal pipes or ground rods are bonding to the ground (not the neutral) buss in the sub-panels.

A good internet reference on NEC Article 250.4 is located at "http://www.iaei.org/magazine/03_f/03_f_threechiefs.htm". It describes the installation detailed in the first post and provides step by step details on adding the fourth (ground wire) and why the isolation must be done in existing installations.

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