Question about THHN wire sizes in conduits???

[jango]

My question is, I have a panel that is somewhat far away from a bathroom (perhaps 75'-100'). The bathroom will require four separate dedicated 20A circuits. I would like to run a flexible conduit from the sub panel to a large junction can in the attic and pull in #10 THHN conductors to make up for conduit fill and voltage drop. The bathroom itself is already wired with 12-2 romex. Can I bring my four 12-2 romex homeruns up to the junction can and splice them with #10 THHN wires that are pulled through the conduit which comes from the sub panel? Can someone refer the section in the code book which may cover this issue?
Thanks so much in advance.

 

[480sparky]

Boxes : Article 314 [box fill are Tables 314.16(A) and (B)]
Flex conduit : Article 348.
Conduit fill : Tables 4 and 5, Chapter 9.

 

[augie47]

Yes you can.

as far as Code goes, the Code does not prohibit it, so it is allowed........................ as long as you follow the rules such as the ones 480 sparkey submitted as I was typing :grin:

 

[Jim W in Tampa]

Your going at this the hard way.Why not simply run some 10-3 romex 2 times.And that really is over kill for a run under 100 feet.Just what loads are on this that a small voltage drop would hurt ?

 

[johnjohn]

I do not beleave you could use greenfield for more than 6 feet. Can you just run 2- 12/3 MC?

 

[iwire]

I do not believe you could use greenfield for more than 6 feet.

Many people believe that but it's a myth.

You can run FMC as far as you want but just as with conduit we are limited to 360 degrees of bends 348.26

If you decide to run it more than 6' you can not use the FMC as the EGC. 250.118(6)(d)

 

[iwire]

Your going at this the hard way.Why not simply run some 10-3 romex 2 times.And that really is over kill for a run under 100 feet.Just what loads are on this that a small voltage drop would hurt ?

I have to agree with Jim here, I would stick with some NM, 12/3s maybe 10/3s.

 

[celtic]

I do not beleave you could use greenfield for more than 6 feet.

He could run the whole entire roll out...no problem....just be sure to add an EGC as required by 348.60, 250.118(5), et al.


I think it would be easier to just run a cable - MC, AC, NM.....maybe even conduit....but we don't know the exact situation.

EDIT:

If you decide to run it more than 6' you can not use the FMC as the EGC. 250.118(6)(d)

250.118(5) is NOT the correct reference....250.118(6)(d) IS correct.


250.118(5)(C) must be where the 6' myth came from