ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Lock-down Thread
by Bill Addiss - 02/27/21 01:16 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 20 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Is there ever a potential for voltage .... #169803 10/16/07 07:01 PM
Joined: Dec 2004
Posts: 78
C
Cinner Offline OP
Member
Is there ever a potential for voltage on a neatral bus bar?

Work Gear for Electricians and the Trades
Re: Is there ever a potential for voltage .... [Re: Cinner] #169805 10/16/07 07:08 PM
Joined: Jul 2007
Posts: 265
W
wire_twister Offline
Member
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
Re: Is there ever a potential for voltage .... [Re: wire_twister] #169807 10/16/07 07:46 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
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.

Re: Is there ever a potential for voltage .... [Re: wire_twister] #169811 10/16/07 08:56 PM
Joined: Jul 2004
Posts: 783
L
LarryC Offline
Member
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

Re: Is there ever a potential for voltage .... [Re: LarryC] #169812 10/16/07 09:12 PM
Joined: Jul 2004
Posts: 9,569
G
gfretwell Online Content
Member
Reno's point about the "grounded" conductor really gets driven home in a corner grounded delta.


Greg Fretwell

Featured:

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
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,721
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,440 Are you busy
209,338 Re: Forum
196,620 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3