ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Any Woodworkers here?
by gfretwell - 05/13/21 01:47 AM
Your favourite food?
by Bill Addiss - 05/12/21 05:23 PM
Lock-down Thread
by gfretwell - 05/11/21 12:30 PM
Do You Travel?
by gfretwell - 05/11/21 12:16 PM
Just be aware of this...
by gfretwell - 05/10/21 07:30 PM
New in the Gallery:
2020 - 2021 Winter Project
Garden 2021
Who's Online Now
0 registered members (), 17 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
Re: Counter EMF [Re: sparkyinak] #208067 12/22/12 09:54 PM
Joined: Mar 2006
Posts: 81
bigpapa Offline
I always understood CEMF and back EMF to be the voltage spike in a circuit that is generated when an inductive coil or winding is opened and the field collapses. It is of opposite (counter) polarity of the applied voltage.

Work Gear for Electricians and the Trades
Re: Counter EMF [Re: sparkyinak] #208068 12/22/12 11:22 PM
Joined: Jun 2004
Posts: 1,273
Tesla Offline

That was my first take...

Until mention of track lighting.


Now, having re-read the OP for a third time:

Question: Is this a three-phase circuit?

Did you have the amp reading taken simultaneously?

( Current flow can easily change by 0.15 A over time, as the load heats up and resistance rises. )

Is your amp-meter as sophisticated as a T5-600/T5-1000 by Fluke?

In which case, exactly where and how a conductor is clamped can shift the apparent amperage drawn by such a trivial amount.

What kind of absolute amperage reading were you pulling?

Last edited by Tesla; 12/22/12 11:22 PM.

Re: Counter EMF [Re: sparkyinak] #208069 12/22/12 11:46 PM
Joined: Jul 2004
Posts: 9,623
gfretwell Online Content
If I saw .15 a I would start looking for a leaky ballast or something. The same kind of thing that trips GFCIs

Greg Fretwell
Page 2 of 2 1 2


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
dallas, texas, USA
Posts: 69
Joined: January 2002
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 19
Admin 11
Popular Topics(Views)
278,942 Are you busy
212,092 Re: Forum
199,115 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3