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本帖最后由 移民电工 于 2010-5-22 07:20 编辑 + s, W. A+ q7 m9 R, M( Z5 t
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Common mistake Question:/ |& X0 ^/ B2 W" J; i
& x7 P4 M9 r* }/ o/ S! eWhat would you do? Lets say you are adding a circuit into a sub-panel, and you see no ground bar. The grounds and neutrals of about twenty 12-2s go to the neutral bars and the box remains ungrounded. Your sub-feed is four wire(A,B,N,G) and the last forgetful sparky left that bar that can bond the box to the neutral bar. please vote.
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Please read Choices:
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发表于 2010-5-22 05:23
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