ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
fuse rejectors
by gfretwell. 03/23/17 01:12 PM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
TRUE POWER
by jraef. 03/21/17 09:13 PM
WEG CFW-11 Frequency Inverter
by jraef. 03/21/17 08:50 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,281 Are you busy
165,994 Re: Forum
160,502 Need opinion
Who's Online Now
0 registered members (), 54 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#48305 - 02/09/05 12:58 AM 50 Volts  
HoseB611  Offline
Member
Joined: Dec 2002
Posts: 18
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?


Work Gear for Electricians and the Trades

#48306 - 02/09/05 02:18 AM Re: 50 Volts  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
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 Re: 50 Volts  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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 Re: 50 Volts  
marcspages  Offline
Member
Joined: Oct 2004
Posts: 48
London, UK
A (near) full description of this can be found here .

M.



Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.003s) Memory: 0.7576 MB (Peak: 0.8864 MB) Zlib enabled. Server Time: 2017-03-24 04:20:40 UTC