Generator Conductors

Merry Christmas
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iwire said:
IMO my made up installation compiles completely with 240.21(B)(5). :smile:
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Well we REALLY don't know that for sure. You said an"Underground Raceway." How do we know you complied with the NEC in an underground installation. You might have run those condutors in ENT thinking we might not notice. Well? fess up!:grin:
 
Dennis Alwon said:
Good now I feel better but where is the violation?
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I don't think there is one. I hadn't read the def of Tap Conductors in so long I assumed it said splice or something similiar.

from the 08

Tap Conductors. As used in this article, a tap conductor is defined as a conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected as described elsewhere in 240.4.
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This IMO is huge given my EE's don't apply this.

For example, that house sized 750 genny we installed puts out 1000A at 480V. The feeder length was around 90'. We installed 3 sets of paralled 400's. The actual load is around 430A.

Think of the savings in wire had the EE applied this.
 
I spent 5 hours today studying commercial calculations and the rest of the day surfin some beautiful clean waves. It's getting late and I'm having a case of the denseness as well. Mr. iwire I give up is their a code violation or not?
 
iwire said:
Hypothetical.

I have a large generator, it has a 400 amp breaker on it.

I installed it about 75' behind my home and ran an underground raceway from the genset in through the foundation directly into the back of a 100 amp fused disconnect.

My calculated load is 95 amps total continuous and non-continuous.

I ran 3 AWG CU XHHW-2 from the 400 amp genset OCPD all the way to the 100 amp fused disconnect inside.

Do I pass inspection or get a red tag.

Remember red tags come with code sections attached. :cool:
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Thanks alot Bob you gave me a brain frezze for a min.,,

but let me state this to you you ran the #3 XHHW CU you should change the OCPD or add a OCPD right after the generator main breaker and use proper size OCPD for #3 main feeder.

i was going say it is ok as long you used the tap rules but somehow i just can't find the tap rules related to underground conductors.

Merci,Marc
 
frenchelectrican said:
i was going say it is ok as long you used the tap rules but somehow i just can't find the tap rules related to underground conductors.

Merci,Marc
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240.21(b)5
 
The Iceman said:
I spent 5 hours today studying commercial calculations and the rest of the day surfin some beautiful clean waves. It's getting late and I'm having a case of the denseness as well. Mr. iwire I give up is their a code violation or not?
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Where did you go out? I was out at Blacks in SD today 1-3 NW. oops off topic.
 
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