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#76164 - 12/20/00 01:42 PM Three Phase Panelboard  
cinkerf  Offline
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
A 100A. three phase four wire mainlug only sub panelboard is fed from a single phase service panelboard 120/240V 200A within the same electric room. There is a three pole 100A. breaker in the single phase service panelboard protecting the three phase panelboard. The three phase four wire panel is used as a single phase panel. I've never seen this set up before. It's obviously an incorrect installation. I don't think a licensed electrican would ever perform such work. We are in the process of trying to locate the General Contractor to get the name of his sub contractor that did the work. Even if the three phase panel is used as a single phase panel proper balancing of loads would be difficult. I located section 210.11(b) to address that violation. Perhaps section 110.3(b) would also be applicable, "Installation and Use" of labeled equipment. Would anyone happen to know any other code sections that would apply to this obvious violation?

Thanks,
(Frank) cinkerf


2017 / 2014 NEC & Related Books and Study Guides

#76165 - 12/20/00 04:33 PM Re: Three Phase Panelboard  
therain4  Offline
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Joined: Dec 2000
Posts: 38
Dunmore,Pa. U>S.A.
article 384=16(f)forbids the use of three phase breakers on panelboards with less than three phases.


#76166 - 12/20/00 06:30 PM Re: Three Phase Panelboard  
cinkerf  Offline
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Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
therain4,
Thank you. That is EXACTLY the section I needed.
(Frank) cinkerf



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