ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
LED retrofit flickers
by rmiell. 01/18/19 08:49 PM
Israel
by Texas_Ranger. 01/14/19 07:12 AM
Free Code class in Maryland 1/16/2019
by Admin. 01/12/19 05:43 PM
Calling all Non-US members!! (Non-US only)
by RODALCO. 01/12/19 02:37 AM
sec cable code conflict
by jake2018. 01/11/19 07:36 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 31 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Cree LED 4" lights- phantom downstream voltage #192748
03/01/10 07:07 PM
03/01/10 07:07 PM
H
Haligan  Offline OP
Member
Joined: Feb 2004
Posts: 115
Berkeley, CA USA
Connected 2 Cree 4" LED cans to dedicated circuit. Powered on, checked placement and operation. Switch off, breaker off.
Come back almost an hour later. Test with voltage pen to make sure no one warmed anything up while I was away. Surprise- there's voltage. Woah.

I put the meter on the hot and neutral of the lights and there is a steady 63v trickling back down from the two lights.

I then disconnected hot, neut, and gnd from circuit. Nothing but the two LED cans.
Still the 63 phantom volts.

What's happening here? It sounds like capacitance draining backwards.

I didn't think to put the ammeter on there.

Work Gear for Electricians and the Trades
Re: Cree LED 4" lights- phantom downstream voltage [Re: Haligan] #192749
03/01/10 07:44 PM
03/01/10 07:44 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Use analog meter...

Voltage will disappear.



Tesla
Re: Cree LED 4" lights- phantom downstream voltage [Re: Tesla] #192750
03/01/10 07:52 PM
03/01/10 07:52 PM
H
Haligan  Offline OP
Member
Joined: Feb 2004
Posts: 115
Berkeley, CA USA
I had no idea. Too much trust in all things digital.


Featured:

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 4
Popular Topics(Views)
252,848 Are you busy
189,630 Re: Forum
179,302 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.022s Queries: 15 (0.005s) Memory: 0.9509 MB (Peak: 1.0745 MB) Zlib enabled. Server Time: 2019-01-24 12:55:57 UTC