Transition from NM cable to PVC conduit

[JoeStillman]

How much of the Romex do we have to strip to do this? 2 pieces of Romex would be over 31% of the 3/4" area, but 6 #12 are not over 40%.

 

[electrofelon]

How much of the Romex do we have to strip to do this? 2 pieces of Romex would be over 31% of the 3/4" area, but 6 #12 are not over 40%.
View attachment 2563283

IMO technically you can't strip NM and run it in a raceway. Romex inner conductors are not an approved NEC conductor on their own.

 

[kwired]

There is no fill restrictions if raceway is used for a sleeve either.

 

[Danielt]

To answer the question, you would strip the romex just after the clamp. I've done this many times in basements, never been failed for it. As mentioned, if under 24" you don't need to worry about fill.

 

[infinity]

If I remember correctly the NM cable jacket must extend 1/4" past the end of the raceway or sleeve.

 

[kwired]

To answer the question, you would strip the romex just after the clamp. I've done this many times in basements, never been failed for it. As mentioned, if under 24" you don't need to worry about fill.

protective sleeves for cables have no fill requirements.

For actual raceways there is no ampacity adjustment required for less than 24 inches, fill wise you still have a 60% limit for these short raceways.

 

[JoeStillman]

protective sleeves for cables have no fill requirements.

For actual raceways there is no ampacity adjustment required for less than 24 inches, fill wise you still have a 60% limit for these short raceways.

In this case, the raceway is more than 24" long.

 

[infinity]

In this case, the raceway is more than 24" long.

Is this a basement or crawl space?

 

[Sparky9527]

In this case, the raceway is more than 24" long.

Sleeve should be between 18" and 10 ft.

 

[infinity]

Sleeve should be between 18" and 10 ft.

Any particular reason why it should be within those dimensions?

 

[packersparky]

Any particular reason why it should be within those dimensions?

I think he is referencing 312.5(C), which would not apply to the OP's diagram.

 

[Canton]

IMO technically you can't strip NM and run it in a raceway. Romex inner conductors are not an approved NEC conductor on their own.

That is true. I agree, I think it’s 310.120

 

[JoeStillman]

It is in a CMU wall, the conduit runs up about 10 feet from an outlet box at 18" AFF through the top plate.

 

[GoldDigger]

It is in a CMU wall, the conduit runs up about 10 feet from an outlet box at 18" AFF through the top plate.

In, as in through the hollow core, or surface mounted?

 

[JoeStillman]

In, as in through the hollow core, or surface mounted?

In the hollow core, where they should have just fished the NM cable to begin with.

 

[eagleelec]

Take a look at 334.15(C). Granted that this is specifically stated for unfinished basements and crawl spaces but it could be used as a reference for a personal interpretation pertaining to an installation of a similar type not specifically in those locations.

 

[jetlag]

When you install romex in conduit you have to count the widest dimension of the romex as if it was a round cable of that diameter . 2 --12/2 romex cables might be an overfill for the 3/4 pvc .

 

[jetlag]

ops I meant to say a round "conductor" of that dimension , not cable .