ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
This Old House
by johno12345. 05/26/18 12:44 PM
Extension cords
by LongRunner. 05/25/18 12:19 PM
Fire source!
by LongRunner. 05/25/18 01:49 AM
Alternative income sources
by gfretwell. 05/24/18 10:07 PM
Furnace igniter leaking noise to stereo
by geoff in UK. 05/23/18 01:18 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 19 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Dropping 1 leg of 480 to control site lighting #200459
04/02/11 01:56 AM
04/02/11 01:56 AM
W
wewire2  Offline OP
Member
Joined: Nov 2002
Posts: 244
California
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 10:37 PM
04/02/11 10:37 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,967
Brick, NJ USA
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 11:39 PM
04/02/11 11:39 PM
W
wewire2  Offline OP
Member
Joined: Nov 2002
Posts: 244
California
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 01:05 AM
04/03/11 01:05 AM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
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 01:06 AM.

George Little
Re: Dropping 1 leg of 480 to control site lighting [Re: wewire2] #200488
04/03/11 02:10 AM
04/03/11 02:10 AM
W
wewire2  Offline OP
Member
Joined: Nov 2002
Posts: 244
California
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.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HotLine1
HotLine1
Brick, NJ USA
Posts: 6,967
Joined: April 2002
Show All Member Profiles 
Top Posters(30 Days)
twh 7
Popular Topics(Views)
246,946 Are you busy
184,347 Re: Forum
173,548 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 15 (0.004s) Memory: 0.9676 MB (Peak: 1.1098 MB) Zlib enabled. Server Time: 2018-05-28 05:09:38 UTC