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#169803 - 10/16/07 08:01 PM Is there ever a potential for voltage ....  
Cinner  Offline
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
Is there ever a potential for voltage on a neatral bus bar?


Work Gear for Electricians and the Trades

#169805 - 10/16/07 08:08 PM Re: Is there ever a potential for voltage .... [Re: Cinner]  
wire_twister  Offline
Member
Joined: Jul 2007
Posts: 265
Georgia USA
As referenced to what?? if the other meter lead is on the ground bus the answer is no if they are properly bonded at the service equipment, if there is potential between neutural and ground they are not bonded properly.


Jimmy

Life is tough, Life is tougher when you are stupid

#169807 - 10/16/07 08:46 PM Re: Is there ever a potential for voltage .... [Re: wire_twister]  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
If you want the right answer ... ask the right question! smile

Ultimately, there is ALWAYS a voltage potential in any neutral wire or neutral buss. Even if your meter reads "0".

You'll get a measurement greater than zero, representing the voltage drop over the path you are measuring. Thus, a bad connection somewhere will lead to a higher reading.

Secondly ... and this is the tricky part to understand .... "0" volts read does NOT mean that electricity isn't flowing like mad through the buss. Just open that neutral, and you;ll see quite a spark ... and probably damage something. This is because all that power delivered by the 'hot' wires is trying to get back to where it was made ... and the neutral buss is part of that path home.


#169811 - 10/16/07 09:56 PM Re: Is there ever a potential for voltage .... [Re: wire_twister]  
LarryC  Offline
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Joined: Jul 2004
Posts: 781
Winchester, NH, US
Quote
As referenced to what?? if the other meter lead is on the ground bus the answer is no if they are properly bonded at the service equipment, if there is potential between neutural and ground they are not bonded properly.


Slight quibble here. If there is sufficient load on the sub panel(s), you can measure a voltage difference between the neutral and the ground busses. In fact, when in a sub panel, if there is 0 Volts between them, and there is significant loading of the panel, I would check for an improper neutral to ground bond.

Larry C


#169812 - 10/16/07 10:12 PM Re: Is there ever a potential for voltage .... [Re: LarryC]  
gfretwell  Offline


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Joined: Jul 2004
Posts: 9,056
Estero,Fl,usa
Reno's point about the "grounded" conductor really gets driven home in a corner grounded delta.


Greg Fretwell


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