Ground at generator
- Thread starter djtazjr
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Re: Ground at generator
You would actualy be running a EGC and you would land it with your neutral.
At the loadcenter, or what have you, you would isolate the neutral the same as you would at a "sub-panel".
This would provide a seperate fault clearing path to the source, and not be in parallel with the neutral, barring any boot legs.
Or you can just tape the ends and not use it.
Roger
[ February 25, 2004, 06:57 PM: Message edited by: roger ]
You would actualy be running a EGC and you would land it with your neutral.
At the loadcenter, or what have you, you would isolate the neutral the same as you would at a "sub-panel".
This would provide a seperate fault clearing path to the source, and not be in parallel with the neutral, barring any boot legs.
Or you can just tape the ends and not use it.
Roger
[ February 25, 2004, 06:57 PM: Message edited by: roger ]
Re: Ground at generator
Yeah, thats what I thought. But its good to get a second opinion, especially since your supervisor doesn't support you very well.
I dont think there are alot of electrician where I am that do not understand parellel neutral currents.
I appreciate your imput roger!
Yeah, thats what I thought. But its good to get a second opinion, especially since your supervisor doesn't support you very well.
I dont think there are alot of electrician where I am that do not understand parellel neutral currents.
I appreciate your imput roger!
Re: Ground at generator
DJ
If the generator is not going to be considered a
SDS you need to do the following:
1. remove the grounding strap from the neurtal to frame.
2. The existing system EGC is connected to the generator frame.
3. The existing system neutral is connected to the generator neutral.
Check 250.20 thru 250.34.
Look at the post just below your post.
[ February 25, 2004, 08:30 PM: Message edited by: bob ]
DJ
If the generator is not going to be considered a
SDS you need to do the following:
1. remove the grounding strap from the neurtal to frame.
2. The existing system EGC is connected to the generator frame.
3. The existing system neutral is connected to the generator neutral.
Check 250.20 thru 250.34.
Look at the post just below your post.
[ February 25, 2004, 08:30 PM: Message edited by: bob ]
Ed MacLaren
Senior Member
Re: Ground at generator
djtazjr,
These sketches may be of assistance.
Ed
Single Phase
Three Phase
djtazjr,
These sketches may be of assistance.
Ed
Single Phase
Three Phase
Re: Ground at generator
Maclaren;
I saw those sketches in another topic about generators. I noticed that the three phase generator there has a floating neutral. The generator I am working with has a isolated neutral bar that I can terminate to.
I would be terminated the grounds to that so that the fault current can return to source.
Thanks for that sketch though. I can use it so show my Supervisor let him know that I am not the only electrician that knows what I am talking about.
Maclaren;
I saw those sketches in another topic about generators. I noticed that the three phase generator there has a floating neutral. The generator I am working with has a isolated neutral bar that I can terminate to.
I would be terminated the grounds to that so that the fault current can return to source.
Thanks for that sketch though. I can use it so show my Supervisor let him know that I am not the only electrician that knows what I am talking about.
Re: Ground at generator
djtazjr, the neutral never floats. In a SDS the neutral is bonded to a GEC, then the EGC's are ran with the grounded and ungrounded conductors.
In a non SDS, that Ed has diagrammed, the neutral is bonded to the GEC at the service panel. Look a little closer at the drawings.
Fault current in a non SDS has to flow back through the service panel MBJ, then to the generator neutral buss.
[ February 25, 2004, 10:55 PM: Message edited by: dereckbc ]
djtazjr, the neutral never floats. In a SDS the neutral is bonded to a GEC, then the EGC's are ran with the grounded and ungrounded conductors.
In a non SDS, that Ed has diagrammed, the neutral is bonded to the GEC at the service panel. Look a little closer at the drawings.
Fault current in a non SDS has to flow back through the service panel MBJ, then to the generator neutral buss.
[ February 25, 2004, 10:55 PM: Message edited by: dereckbc ]
Ed MacLaren
Senior Member
Re: Ground at generator
djtazjr,
Just to clarify, the term "floating" in my sketches is only meant as an abbreviation for "not bonded to the frame".
As Dereck stated, the neutral would not be floating once it was connected into a wiring system.
Ed
djtazjr,
Just to clarify, the term "floating" in my sketches is only meant as an abbreviation for "not bonded to the frame".
As Dereck stated, the neutral would not be floating once it was connected into a wiring system.
Ed
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