Little Romex Question

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George Stolz

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Windsor, CO NEC: 2017
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johnsrig.jpg

Four 12-2 NM home runs are routed through a series of holes continuously for ten feet (as in, along the blue line in this diagram).

What is the maximum breaker size I can connect these circuits to?
 

augie47

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Tennessee
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State Electrical Inspector (Retired)
depends on what the load is :) HVAC, motors, or just general purpose circuits.
For circuits not coverd by 240.4(G), I would say a 20 amp. I don't see where you have introduced any enviornment where derating would effect you to a point of reducing the ampacity.
One more Romex and the story might change.
 

Dennis Alwon

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Chapel Hill, NC
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Where I am the inspectors say a series of holes is bundling, but with four 12-2s' I would be allowed to use a 20 amp breaker.
I agree but many inspectors would not consider this bundling and in this case it doesn't matter with the derating at 70%.
 

augie47

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Tennessee
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I agree, since it's George asking.
I too am waiting on the other shoe to drop :grin:
 

Jim W in Tampa

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Tampa Florida
Derating here is no issue. Now if i run 5 thru holes we might have issues. Just exactly where do we begin saying BUNDLING ? I am curious just where inspectors draw the line and how do you back it up with code ? What does it take to not be bundling ? 1/4 inch, 1/2, 1 ?
 
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infinity

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New Jersey
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depends on what the load is :) HVAC, motors, or just general purpose circuits.
For circuits not coverd by 240.4(G), I would say a 20 amp. I don't see where you have introduced any enviornment where derating would effect you to a point of reducing the ampacity.
One more Romex and the story might change.

I agree, but wonder what George has up his sleeve. ;)
 

kwired

Electron manager
Location
NE Nebraska
Do you feel that Stack-Its are a viable means to avoid bundling when running down a stud?

The type that maintain a space between cables have avoided bundling for you. If you are using stacking type staples then you still have the cables effectively bundled together
 
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