Building supplied by feeder NEC250.32

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PowerdT

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Electrical Engineer
I need to provide power to the existing 100A, 120/208V, 3 phase panel for a building.

Across the street there is transformer and associated main switchboard. The power needs to be distributed overhead.

my plan is to pull 100A from main switchboard and run quadplex with bare neutral and no ground and provide N-G bond at service entrance.

what is another alternative way to provide power overhead to the building ?
 
I think you need to find some "quint-plex" or whatever it's called with four insulated conductors.

I don't believe the NEC would allow a bare neutral and new bond at the load end of your feeder.
 
LarryFine said:
I think you need to find some "quint-plex" or whatever it's called with four insulated conductors.

I don't believe the NEC would allow a bare neutral and new bond at the load end of your feeder.
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I couldn’t find UL listed quintplex, I’m hesitating if they even exist
 
Etanuye said:
I couldn’t find UL listed quintplex, I’m hesitating if they even exist
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It doesn't. Use another type of overhead wiring method (not likely) or use quadplex with a separate insulated neutral lashed to it and use the messenger wire as the EGC. I have approved that in my jurisdiction in the past.
 
texie said:
It doesn't. Use another type of overhead wiring method (not likely) or use quadplex with a separate insulated neutral lashed to it and use the messenger wire as the EGC. I have approved that in my jurisdiction in the past.
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i will consult my jurisdiction. Did you use GEC at the separate building?
 
texie said:
It doesn't. Use another type of overhead wiring method (not likely) or use quadplex with a separate insulated neutral lashed to it and use the messenger wire as the EGC. I have approved that in my jurisdiction in the past.
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I have wondered if the situation would ever come up in my career - aerial 5-wire. If I had to do it I would just get quad and twist another conductor around it

Also you can probably just order it. I
have ordered custom wire combinations and had them plexed, I don't see why they couldn't throw in an ACSR in there
 
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I'm submitting a request to https://www.wireandcableyourway.com/special-order-rfq to ask whether they have it or can make it.

I'll let you know what they say. My message:

Hello. I am am an electrical contractor and a major contributor to the Mike Holt NEC forum, which has a large membership. The question has arisen regularly and again today: Is there a "quint-plex" aluminum overhead cable assembly available? This would be for outside 3-phase feeders where three lines and an insulated neutral are required in addition to the messenger/EGC. Sizes asked about range from 100a and up.
Thank you, Larry
 
LarryFine said:
I'm submitting a request to https://www.wireandcableyourway.com/special-order-rfq to ask whether they have it or can make it.

I'll let you know what they say. My message:

Hello. I am am an electrical contractor and a major contributor to the Mike Holt NEC forum, which has a large membership. The question has arisen regularly and again today: Is there a "quint-plex" aluminum overhead cable assembly available? This would be for outside 3-phase feeders where three lines and an insulated neutral are required in addition to the messenger/EGC. Sizes asked about range from 100a and up.
Thank you, Larry
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I really appreciate that and Thank you for the link
 
How about just running two sets of triplex? That gives you four insulated conductors and two bare (one redundant) grounds.
 
You could make your own cable by attaching tray cable to a steel messenger support. If you do this I would use stainless steel ty-raps to attach the TC to the messenger. Article 396.
 
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