ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 16 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
photo cell 208v #161537
04/04/07 01:38 AM
04/04/07 01:38 AM
A
aldav53  Offline OP
Member
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
Is it legal to install a 208v photo cell so it switches one side of the 2 phases? I would think running it through a 2 or 4 pole contactor to switch both sides would be better. I found one done this way and think they had trouble with it, (not to mention that one side would still be hot if you were working on it). It was for some parking lot lights. I put a contactor controlled by a photo cell on it.


The Golden Rule - "The man with the gold makes the rule"
2017 / 2014 NEC & Related Books and Study Guides
Re: photo cell 208v [Re: aldav53] #161562
04/04/07 10:38 AM
04/04/07 10:38 AM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,166
Estero,Fl,usa
410.48 and 410.54 seem to support that view


Greg Fretwell
Re: photo cell 208v [Re: gfretwell] #161566
04/04/07 11:34 AM
04/04/07 11:34 AM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Good Call Greg. I learned something today.


George Little
Re: photo cell 208v [Re: George Little] #161568
04/04/07 12:02 PM
04/04/07 12:02 PM
Y
yanici  Offline
Member
Joined: Sep 2006
Posts: 58
Atlantis
Yeah, Greg. I tried to find a way to get around opening both legs and even went to some photocell manufactures sites. Looks like aldav53 is correct.

Re: photo cell 208v [Re: yanici] #161576
04/04/07 02:54 PM
04/04/07 02:54 PM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,166
Estero,Fl,usa
My first guess was it might be OK if you had a 2 pole disconnect in front of the photocell but I don't see the language that supports it. I know you can have some types of equipment that allow this for control only (with a real disconnect present) but "lamp holders" and ED lighting does not seem to be included. If the installation was such that it was clear that the future maintainer could relamp safely I might be softer on this ruling.


Greg Fretwell
Re: photo cell 208v [Re: gfretwell] #161616
04/05/07 07:09 AM
04/05/07 07:09 AM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I've seen plenty of HPS & Metal Halide floods & wallpacks that were supplied by 208 volt or 240 branch circuits and were individually controlled by a photocell. Since these fixtures came from the factory that way and are UL listed, I think the second paragraph of 90.7 would allow a factory installed photocell to switch just one energized conductor.

Of course, if you're the AHJ, it is up to you to approve equipment, listed or not.110.2


Few things are harder to put up with than the annoyance of a good example.
Re: photo cell 208v [Re: Tom] #161626
04/05/07 10:56 AM
04/05/07 10:56 AM
G
gfretwell  Online Content

Member
Joined: Jul 2004
Posts: 9,166
Estero,Fl,usa
A lot of things go on inside listed products that we would not allow in field assembled equipment. I suppose it would really come down to your AHJ's definition of "switching device". If you called the PC something else and there was a real 2 pole switch present for safe relamping, I would not be all that concerned.


Greg Fretwell

Featured:

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

 

Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,708
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 16
Potseal 15
Popular Topics(Views)
243,583 Are you busy
180,379 Re: Forum
170,856 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 15 (0.004s) Memory: 0.9843 MB (Peak: 1.1426 MB) Zlib enabled. Server Time: 2018-01-21 22:34:28 UTC