ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Happy Father's Day!
by Bill Addiss - 06/19/21 04:16 PM
A Risky Setup
by timmp - 06/18/21 08:08 PM
Where is Everyone?
by gfretwell - 06/18/21 11:07 AM
Conduit over Vinyl Siding
by Jim M - 06/16/21 08:30 PM
Updated Forum Software
by Admin - 06/15/21 10:23 AM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 3 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#48305 02/09/05 12:58 AM
Joined: Dec 2002
Posts: 18
H
Member
Why is it when you have a switched outlet (the top is switched and the bottom is always hot), you turn off the switch that there is still 50 volts reading on the switch leg? When you ground the switch leg the voltage goes away? Electrical phenomenon?

#48306 02/09/05 02:18 AM
Joined: Jul 2004
Posts: 9,645
G
Member
That is just a problem with these new high impedance meters. Withno load on the line you will see antenna effect.


Greg Fretwell
#48307 02/09/05 05:49 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
NEMA calls this 'phantom voltage' and it is real voltage with almost no current.

The wire that you are getting 50 volts on is picking this up simple by running next to other live wires.

You meter draws so little current it can measure this phantom voltage.

Try the same thing with an older analog meter.

Or use a set of Wiggys and a digital at the same time and you will see 0 volts on the digital.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#48308 02/09/05 06:55 AM
Joined: Oct 2004
Posts: 48
M
Member
A (near) full description of this can be found here .

M.


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
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Top Posters(30 Days)
Trumpy 10
Admin 10
Popular Topics(Views)
280,437 Are you busy
213,517 Re: Forum
200,399 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5