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Lemkie 10-04-2012 08:59 AM

Electrical panel ground wires
 
Hello everyone. I was looking at the wiring in my fuse panel earlier and want to make sure everything is wired correctly. All the hots are separately wired and all the neutrals are hooked up separately which to me looks like, however all the grounds coming into the panel are twisted together. From there one ground wire is going to what I assume is the grounding block. The grounding block has 4 spaces with only the one being used. Is this correct? Also, if any new wiring is added can that new wire's ground go to a separate spot in the grounding block or should it just be twisted together with the rest?

Another thing i noticed is that there are two empty bars offset from the two bars that the neutral wires are connected to. I'm not sure what these are for. The shot grounding bar is tucked back in the bottom left corner of the panel.

I took a few pictures to help. The first shows all the grounds twisted together in the far back. The second shows the neutral bars, with the grounding bar in the fast back on the left. The third shows the one ground wire going to the grounding bar in the bottom left corner.

http://img.photobucket.com/albums/v2...1004-00039.jpg

http://img.photobucket.com/albums/v2...1004-00038.jpg

http://img.photobucket.com/albums/v2...1004-00037.jpg

jbfan 10-04-2012 09:03 AM

Not the best practice, but it has been done in many panels.

Lemkie 10-04-2012 09:16 AM

Quote:

Originally Posted by jbfan (Post 1023568)
Not the best practice, but it has been done in many panels.

What would best practice be? And also if new circuits were added should they be grounded to a separate spot on the grounding bar or just wired into the twisted group of ground wires?

Also what are the two empty bars for behind the neutral bars?

electures 10-04-2012 09:19 AM

Quote:

Originally Posted by Lemkie (Post 1023566)
Hello everyone. I was looking at the wiring in my fuse panel earlier and want to make sure everything is wired correctly. All the hots are separately wired and all the neutrals are hooked up separately which to me looks like, however all the grounds coming into the panel are twisted together. From there one ground wire is going to what I assume is the grounding block. The grounding block has 4 spaces with only the one being used. Is this correct? Also, if any new wiring is added can that new wire's ground go to a separate spot in the grounding block or should it just be twisted together with the rest?

Another thing i noticed is that there are two empty bars offset from the two bars that the neutral wires are connected to. I'm not sure what these are for. The shot grounding bar is tucked back in the bottom left corner of the panel.

I took a few pictures to help. The first shows all the grounds twisted together in the far back. The second shows the neutral bars, with the grounding bar in the fast back on the left. The third shows the one ground wire going to the grounding bar in the bottom left corner.

http://img.photobucket.com/albums/v2...1004-00039.jpg

http://img.photobucket.com/albums/v2...1004-00038.jpg

http://img.photobucket.com/albums/v2...1004-00037.jpg

No pictures.

Lemkie 10-04-2012 09:20 AM

Quote:

Originally Posted by electures (Post 1023573)
No pictures.

I don't understand?

electures 10-04-2012 09:39 AM

Quote:

Originally Posted by Lemkie (Post 1023574)
I don't understand?

I can't see your pictures. Don't know if it is just my pc or not. Can anybody else see the pics?

Dave632 10-04-2012 09:46 AM

I see the pics just fine.

Stubbie 10-04-2012 09:57 AM

Quote:

Originally Posted by electures (Post 1023590)
I can't see your pictures. Don't know if it is just my pc or not. Can anybody else see the pics?

They show for me ... maybe you can see them now ?

Stubbie 10-04-2012 10:11 AM

Quote:

What would best practice be? And also if new circuits were added should they be grounded to a separate spot on the grounding bar or just wired into the twisted group of ground wires?
Best practice would be for individual grounds to be terminated separately.

Terminate the new circuit grounds separtely.



Quote:

Also what are the two empty bars for behind the neutral bars
Those are just additional bars to terminate neutrals. But this also poses a question.

Is this your service equipment ... the only panel where your means to disconnect all power from the utility exists? It is necessary to know before answering some of your questions.

I'm not seeing your earth grounding or a main bonding jumper is why I'm asking.

joed 10-04-2012 10:47 AM

Two neutrals under one screw is wrong.
The grounds should be wire nutted or crimped together.

alexlacelle 10-04-2012 10:50 AM

.....

alexlacelle 10-04-2012 10:51 AM

.....

Lemkie 10-04-2012 10:54 AM

Quote:

Originally Posted by stubie (Post 1023615)
Best practice would be for individual grounds to be terminated separately.

Terminate the new circuit grounds separtely.





Those are just additional bars to terminate neutrals. But this also poses a question.

Is this your service equipment ... the only panel where your means to disconnect all power from the utility exists? It is necessary to know before answering some of your questions.

I'm not seeing your earth grounding or a main bonding jumper is why I'm asking.

This is the only panel. I can terminate the new circuit separately on that short grounding bar. But all the others will still be twisted together with only the one wire going to the grounding bar.

Lemkie 10-04-2012 10:55 AM

Quote:

Originally Posted by joed (Post 1023626)
Two neutrals under one screw is wrong.
The grounds should be wire nutted or crimped together.

I did notice the two under the one screw and have room to change that.

Is there a wire nut big enough for all the wires to fit?

Stubbie 10-04-2012 12:31 PM

Quote:

Originally Posted by Lemkie (Post 1023632)
This is the only panel. I can terminate the new circuit separately on that short grounding bar. But all the others will still be twisted together with only the one wire going to the grounding bar.

Then we need to affirm your main bonding jumper. This is generally a screw or other conductive means to join (bond) the neutral bar(s) to the metal of the panel. This is critical if the grounds rely on the metal of the panel to move fault currents to the neutral bus and ultimitely the service neutral so that your fuses can open.


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