ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Contractor Connections
by restoleads - 11/26/20 02:37 AM
Happy Thanksgiving
by sabrown - 11/25/20 02:00 PM
Work Gloves?
by sabrown - 11/25/20 01:54 PM
Insulated Tools: A Waste of Money?
by sabrown - 11/25/20 01:52 PM
What does your work place look like?
by Lostazhell - 11/25/20 02:56 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 16 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
photo cell 208v #161537 04/04/07 01:38 AM
Joined: Aug 2001
Posts: 545
A
aldav53 Offline OP
Member
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
Joined: Jul 2004
Posts: 9,541
G
gfretwell Offline
Member
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
Joined: Jan 2004
Posts: 1,507
G
George Little Offline
Member
Good Call Greg. I learned something today.


George Little
Re: photo cell 208v [Re: George Little] #161568 04/04/07 12:02 PM
Joined: Sep 2006
Posts: 58
Y
yanici Offline
Member
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
Joined: Jul 2004
Posts: 9,541
G
gfretwell Offline
Member
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
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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
Joined: Jul 2004
Posts: 9,541
G
gfretwell Offline
Member
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:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
renosteinke
renosteinke
Blue Collar Country
Posts: 5,316
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 9
Popular Topics(Views)
271,953 Are you busy
205,843 Re: Forum
193,921 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3