How would one go about figuring the number of NM cables(sheath included) that would be allowed in a particular size conduit? These would be installed in PVC conduit that would be used as a protective sleeve down a wall. I realize that derating also has to be taken into consideration, but am unsure as to the wire fill since the sheath is still on . Thanks
NM cable/ conduit fill
- Thread starter nizak
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glene77is
Senior Member
- Location
- Memphis, TN
Agree.
Considering the potential for 'jamming',
this is a good interpretation. :happyyes:
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Scroll down to the second page of this site for Southwires NM dimensions. It will give you something to go by.
inspector141
Senior Member
- Location
- Westminster, MD
It is not necessary to size the raceway or derate the ampacity of the conductors. Chapter 9, Note 2 says table 1 is for complete raceway systems and is not for protecting exposed wiring from physical damage.
So what does this mean? As long as the cable will fit into the raceway, it is compliant. Derating is already required whether it is a cable or raceway in 310.15(B)(3)(A)
So what does this mean? As long as the cable will fit into the raceway, it is compliant. Derating is already required whether it is a cable or raceway in 310.15(B)(3)(A)
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I agree as long as the sleeve does not extend between boxes or cabinets etc.
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