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#77085 - 04/20/01 10:52 AM Code Enforcement Overkill?  
Pete  Offline
Junior Member
Joined: Apr 2001
Posts: 1
Built a metal building, with office inside with metal studs. No wood anywhere. Bldg & studs are grounded. Each receptacle has its own grounding lead. Our code enforcement inspector says each junction box must also have a grounding lug. Further, any rigid metal conduit with more than 3 load carrying conductors, conductors must be derated. So, if a 2" conduit has 4 conductors, the wire must be oversized. I'd appreciate comments.


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#77086 - 04/20/01 11:03 AM Re: Code Enforcement Overkill?  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Pete,
250-148(a) requires the EGC to be connected to the box. Table 310-15(b)(2)(a) requires derating of conductors for more than 3 current carrying conductors. Remember that is you are using THHN you can use the 90°C ampacity for derating purposes.
Don(resqcapt19)


Don(resqcapt19)

#77087 - 04/20/01 06:47 PM Re: Code Enforcement Overkill?  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Pete,

Don's reply is right on the money. With THHN insulation in a dry location, you usually don't have a derating problem (at least in the smaller sizes) until you get to the 10th conductor.

Tom


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