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frank melillo

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we are wiring a 1000kw 3 phase plus netural 480 volt generator .for emergency use only. i believe i found the article to be 701.
i also believe that this is not a separately derived system a need to be grounded once and the grounding i will find in article 250.66
 
frank melillo said:
we are wiring a 1000kw 3 phase plus netural 480 volt generator .for emergency use only. i believe i found the article to be 701.
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If it is in fact "emergency" it would be article 700
frank melillo said:
i also believe that this is not a separately derived system a need to be grounded once and the grounding i will find in article 250.66
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If it is not an SDS the existing grounding is all that is needed, the solid neutral between this system and the utility is one and the same.

Roger
 
generator

and it if the ats was switching the neutral then it would become a sds and the neutral would have to grounded.
and in both cases the frame of the generator would have to be grounded also.
 
generator

and the ground would go to a grounding electrode and the bond would go from the grounded conductor to the frame .
and both would be a 2/0
 
generator

and in accordance with 250.66

one other question if i have a 4,000 amp service switch 3 phase 4 wire.
where does it tell me that it needs two grounds.i do it but i juat cant for some reason find the article
 
frank melillo said:
and in accordance with 250.66

one other question if i have a 4,000 amp service switch 3 phase 4 wire.
where does it tell me that it needs two grounds.i do it but i juat cant for some reason find the article
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See 250.50 through 250.56

Roger
 
You're welcome and good luck with the project.

Roger
 
ceb58 said:
Roger, this is the most I have ever seen you post own one subject. And you used more than three words. Go rest now I know your fingers are tired:D:D:D:D
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I'm worn slap out. ;)

Roger
 
frank melillo said:
and the ground would go to a grounding electrode and the bond would go from the grounded conductor to the frame .
and both would be a 2/0
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The conductor from the grounding electrode (in the case of outside generators, most likely the ground rod), the conductor is bonded to the generator enclosure and the generator equipment ground conductor is bonded to the generator enclosure.
As you described, the SDS (your generator) gets wired as I have described.




The bonding is performed differently (than you have posted, which I underlined) for a SDS. Treat the generator wiring similar to a "subpanel". The grounded conductor, is separated from the equipment grounding conductor and it is also separated from the frame (enclosure) of the generator. The grounding electrode conductor is bonded to the generator enclosure and the equipment ground conductor, and separated from the grounded conductor.
 
frank melillo said:
and if it is not an sds.
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Frank, you are confusing the crap out of your self :D.

First are you working with a non- sds ( grounded conductor (neutral) not switched)
OR
Are you working with a sds (grounded conductor (neutral) switched)

Go back and reread Roger's post 6,8 & 10
In a nut shell if it is a non sds then you do not bond the grounded conductor and the EGC together. The EGC is bonded to the frame only.

If it is a sds you bond the grounded conductor and the GEC along with the EGC to the frame
 
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