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Dropping 1 leg of 480 to control site lighting #200459 04/02/11 12:56 AM
Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
Is there a code reference that prohibits dropping 1 leg of a 480 circuit to control HID lighting? I notice 410.141(B) only applies to fixtures exceeding 1000V.

2017 / 2014 NEC & Related Books and Study Guides
Re: Dropping 1 leg of 480 to control site lighting [Re: wewire2] #200480 04/02/11 09:37 PM
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HotLine1 Offline
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Wewire2:

Care to explain the above with a little more clarity please.


John
Re: Dropping 1 leg of 480 to control site lighting [Re: wewire2] #200485 04/02/11 10:39 PM
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wewire2 Offline OP
Member
Sure, thanks John.
3 phase 480, 3 wire is pulled to a light pole with 4
fixtures on the pole. The site engineer wants to drop legs to control the lights separately. I don't like the design but can't seem to find anything that prohibits it as long as the required disconnecting means is in place. What do you think?

Re: Dropping 1 leg of 480 to control site lighting [Re: wewire2] #200486 04/03/11 12:05 AM
Joined: Jan 2004
Posts: 1,507
G
George Little Offline
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Look at 410.104(B). I don't know if it applies but it could. Not sure what the Design Professional has in mind but this might help.

Last edited by George Little; 04/03/11 12:06 AM.

George Little
Re: Dropping 1 leg of 480 to control site lighting [Re: wewire2] #200488 04/03/11 01:10 AM
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wewire2 Offline OP
Member
George, I think that's what I'm looking for. The "auxiliary
equipment" terminology threw me off and I skimmed right past it. It appears that the term auxiliary equipment refers to ballast. Thank you sir!

410.104(B)Where supplied by ungrounded conductors of a circuit, the switching device of auxiliary equipment shall simultaneously disconnect all conductors.


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