SER and SEU...

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Dennis Alwon said:
Why not. It explicitly says branch circuits and feeders. Is the cable carrying the full load after the main disco not considered a feeder? If it is in the interior and a feeder then this section applies. No exceptions are given.
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My guess is because the feeder is not required to have an allowable ampacity greater than their service entrance conductors.
 
infinity said:
My guess is because the feeder is not required to have an allowable ampacity greater than their service entrance conductors.
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It says ampacity not wire size. If seu is rated at 60 then it's ampacity does not have to be larger then the service entrance conductors but the conductor size might be larger in cir. mil.
 
Dennis Alwon said:
Why not. It explicitly says branch circuits and feeders. Is the cable carrying the full load after the main disco not considered a feeder? If it is in the interior and a feeder then this section applies. No exceptions are given.
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I asked this months ago and I don't think I ever got a straight answer. Or something like it anyway.

What allows 310.15(B)(6) to over rule the other sections that would apply to se installations.
 
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Dennis Alwon said:
It says ampacity not wire size. If seu is rated at 60 then it's ampacity does not have to be larger then the service entrance conductors but the conductor size might be larger in cir. mil.
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I think it is fantasy to think an inspector is going to have anyone run larger (cir mil) conductors for a feeder then the service conductors it is supplied by.
 
iwire said:
I think it is fantasy to think an inspector is going to have anyone run larger (cir mil) conductors for a feeder then the service conductors it is supplied by.
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I know one that has already said as much. They are out there.....;)
 
I think there are two arrows that point to 310.15(B)6. One is 215.2(A)3 and 338.80

(3) Individual Dwelling Unit or Mobile Home Conductors. Feeder conductors for individual dwelling units or mobile homes need not be larger than service conductors. Paragraph 310.15(B)(6) shall be permitted to be used for conductor size.

334.80 Ampacity.
The ampacity of Types NM, NMC, and NMS cable shall be determined in accordance with 310.15.

(6) 120/240-Volt, 3-Wire, Single-Phase Dwelling Services and Feeders.
The feeder conductors to a dwelling unit shall not be required to have an allowable ampacity rating greater than their service-entrance conductors.( It's hard to tell if this sentence is refering to the main feeder or any feeder.)
Rick
 
Dennis Alwon said:
I know one that has already said as much. They are out there.....;)
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Of course, I should know never to say never on this forum.

So should the EC buckle under or say 'make me'.

You really see this as an issue? I guess I just don't see it the same.
 
iwire said:
Of course, I should know never to say never on this forum.

So should the EC buckle under or say 'make me'.

You really see this as an issue? I guess I just don't see it the same.
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Bob I really don't see it as a big issue at all. I am just looking at the wording and seeing some of the issues that arise.

We have been wiring like this for years with no issues but that doesn't mean it is legal anymore. We are discussing code, I thought, not necessarily what we think is safe or not. Obviously there is plenty of fudge in the code or there would be a lot more dead people from wiring.:grin:
 
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