ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Danish type K Sockets
by winston_1 - 10/25/21 07:30 PM
Flexible Conduit?
by gfretwell - 10/24/21 01:59 AM
May I backfeed 3 phase transformer?
by dsk - 10/22/21 04:37 AM
Wire sizing
by gfretwell - 10/21/21 10:12 PM
GFCI's pops in large numbers
by dsk - 10/21/21 02:03 AM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 36 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#219098 01/22/18 11:52 AM
Joined: Jan 2018
Posts: 1
D
New Member
I have a 208-277 photocell on a LED wallpack and the supply voltage is reading 286v. When I cover the photocell the light does not come on but if I disconnect the neutral wire from the B phase and reconnect it the light comes on for 10 secs like normal. The issue is the photocell is covered and the light still turns off. Will the incoming voltage of 286 make the photocell not work correctly because it is out of the voltage range or is it just a bad photocell.

Docholiday #219099 01/22/18 06:06 PM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
Do you have line and load reversed?

Docholiday #219181 02/28/18 08:11 PM
Joined: Jan 2002
Posts: 70
Member
That voltage of 286 is actually fine. I would be more concerned if the line and low are backwards like twh stated. You probably have it figured out by now.

Docholiday #219182 03/01/18 09:16 AM
Joined: Apr 2002
Posts: 7,283
Likes: 3
Member
The OP said 'if I disconnect the neutral wire from 'b' phase.....' ??

IS that a mis-statement, or does he have 480 volt going to the PC??

Black to line (phase a, b, or c), white to neutral, and red to load.



John
Docholiday #219194 03/10/18 12:04 AM
Joined: Jul 2002
Posts: 8,407
Likes: 2
Member
I would like to ask OP what sort of "photo-cell" he is actually using.
It could be that the photo-cell is either set up in the wrong mode or the sensitivity level is set wrong, these things are not "plug and play".
At the end of the day all these things are is a voltage in through two terminals and a single change-over contact on the output (NO/NC), with a common terminal

Last edited by Trumpy; 03/10/18 12:08 AM. Reason: Added last bit.

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
pcsailor
pcsailor
Minneapolis, MN, USA
Posts: 21
Joined: September 2019
Top Posters(30 Days)
dsk 7
wa2ise 1
Popular Topics(Views)
284,930 Are you busy
217,466 Re: Forum
203,765 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5