transman2
Senior Member
- Location
- Brooklet,Ga.
Is it leagal to feed equipment from the line side of a disconnect with different size conductors.
load side of disconnect
- Thread starter transman2
- Start date
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- Location
- Logan, Utah
Could you explain your situation a little bit better, I'm having a hard time understanding your question.
Chris
Chris
transman2
Senior Member
- Location
- Brooklet,Ga.
Sure, transfer switch feeding a 400a fused disconnect with 2 - 500kcmil per phase, feeding off the line side of that 400a fused disconnect it shows 2 - 500kcmill per phase feeding another 400a fused disconnect, it also shows 1 - #6 per phase to a mini power center. Each 400a fused disconnect load side feeds 3 motors. This is how the drawing show it. Hope this helps.
- Location
- Logan, Utah
Ok I think I have a better understanding of the situation.
The #6 conductors tap off the line side of the 400 amp disconnect and terminate on a mini power center. Is this correct?
What is the size of the upstream overcurrent protective device ahead of the 400 amp disconnect? How long are the #6 conductors and what do they terminate on?
They may be compliant if you comply with one of the tap rules located in 240.21(B).
Chris
The #6 conductors tap off the line side of the 400 amp disconnect and terminate on a mini power center. Is this correct?
What is the size of the upstream overcurrent protective device ahead of the 400 amp disconnect? How long are the #6 conductors and what do they terminate on?
They may be compliant if you comply with one of the tap rules located in 240.21(B).
Chris
transman2
Senior Member
- Location
- Brooklet,Ga.
Chris,
Its outside and the mini power panel has a 30amp main. Upstream transfer switch is either 600 or 800 amps not sure due to engineer changing his mind. So I believe 240.21 (B)(5)applies. I cant remember seeing different size wire and lugs on line or load side of anything. I guess they might have to do a trough and then tap.???
Its outside and the mini power panel has a 30amp main. Upstream transfer switch is either 600 or 800 amps not sure due to engineer changing his mind. So I believe 240.21 (B)(5)applies. I cant remember seeing different size wire and lugs on line or load side of anything. I guess they might have to do a trough and then tap.???
- Location
- Logan, Utah
Correct, they may have to install a tap block in a wireway to accomplish this.
Chris
transman2
Senior Member
- Location
- Brooklet,Ga.
Thanks....
It helps a great deal that all this is outside as 240.21(B)(5) in the most lenient.
I agree that proper termination (rated lugs) may be the biggest hurdle.
Also note the general wording of 240.21 prevents you from "tapping a tap", so if you overcome all other obstacles, the connections would have to be made at the termination of full size conductors such as at the first switch or tap block.
I agree that proper termination (rated lugs) may be the biggest hurdle.
Also note the general wording of 240.21 prevents you from "tapping a tap", so if you overcome all other obstacles, the connections would have to be made at the termination of full size conductors such as at the first switch or tap block.
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