PVC Conduit Fill for Romex

bczygan · Oct 10, 2016

I've been told that conduit fill percentages apply for Romex in PVC, but only over 2' in length.

True?

I assume that you can put multiple runs of Romex in a PVC conduit. Correct?

And if fill percentages are met, what keeps the Romex from sliding through it? And especially at the panel, what fastens it and the PVC?

Bill

walrus · Oct 10, 2016

bczygan said:
I've been told that conduit fill percentages apply for Romex in PVC, but only over 2' in length.

True?

I assume that you can put multiple runs of Romex in a PVC conduit. Correct?

And if fill percentages are met, what keeps the Romex from sliding through it? And especially at the panel, what fastens it and the PVC?

Bill

What fastens an individual wire to or in a conduit? Nothing so don't worry about that with romex The pvc is fastened to panel by a male adapter and a lock nut. There is an exception for ******* less than 24", fill calcs go out the window. You can put multiple runs in PVC conduit, if you put too many in you will have derating issues along with fill calcs

Aceman · Oct 10, 2016

Is the conduit complete between a box(es) and panel? Or is it just a sleeve to chase Romex through where you're worried it might get damaged?

bczygan · Oct 10, 2016

Aceman said:
Is the conduit complete between a box(es) and panel? Or is it just a sleeve to chase Romex through where you're worried it might get damaged?

Surface mount on brick wall in garage/shop.

2 things.

From this sub panel up through ceiling to feed circuits in the garage/shop. And also through block wall from main panel in basement, and up wall to feed main breaker at bottom of panel (Inverted panel). a Feed to this sub is 90A circuit 2,2,2,4 from main in basement. So, for protection. Not from box to box.

Bill

bczygan · Oct 10, 2016

I do so love electrical and electronic stuff.

It's so..........Mathematical!

Bill

Aceman · Oct 10, 2016

Believe it or not, there are quite a few codes surrounding running Romex through conduit into a surface mount panel.

I will list just some of the articles because it's too much for me to explain:

312.5(C)
334.15(B)
334.80
Ch. 9(notes to tables)

etc.

bczygan · Oct 11, 2016

Aceman said:
Believe it or not, there are quite a few codes surrounding running Romex through conduit into a surface mount panel.

I will list just some of the articles because it's too much for me to explain:

312.5(C)
334.15(B)
334.80
Ch. 9(notes to tables)

etc.

I do so hate reading the NEC.

Makes my head hurt!

Bill

jekquist · Oct 13, 2016

Best bet it to call your county inspector and ask. For a sleeve(protection) the fill rates are different. I called my inspectors, he told me to anything below 8' needs to be sleeved in conduit. I used 3/4" EMT for everything. The 14-2/14-3 lights and the 12-2 for outlets. You can easily fit 2 (14-2 NM) in a 3/4" emt, with room to spare. My county is pretty lax though.

Edit: They sell a plastic bushing for the EMT, not sure if they do for PVC. I already had a 3/4" emt bender so I just went with EMT.

PVC Conduit Fill for Romex

bczygan

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walrus

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Aceman

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bczygan

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bczygan

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Aceman

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bczygan

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jekquist

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