Sharing conduit (respect to code)

GoyimPersuasion

I have two subs in which one of them will be fed with 4awg Thhn conductors and the other with 6/3 romex. Would sharing these feeds in the same conduit abide by code? Do i even need conduit for indoor runs? Planning on using flexible conduit if indeed required. Thanks!

Speedy Petey

Why in the world would you put 6/3NM in conduit indoors?
Why would you do it at all?

The size of conduit you would need would offset the reason for using conduit in the first place.

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wirenut1110

No, not normally is conduit required indoors. The NM anyway.

If you run the separate THHN conductors, they will need to be in some type of raceway.

The 6/3 will need to be derated to the 60 deg chart, and the THHN conductors use the 75 deg chart.

As always, it's best to check with your local authority, you never know, they may be from Chicago.

GoyimPersuasion

Haha, its you again, thanks for the reply.......Why in the world you ask?
Well in my world putting all feeds in a single conduit then feeding them to the service is much easier than otherwise, with dual feed, therefore double the material and double the labor (drilling holes, fittings, screwing, etc).

Please clarify. So your un-offsetting implementation would be to use conduit for the Thhn and bare run for NM?? Wouldn't 2" conduit house both feeds generously? Its not like i would require 12"conduit......lol This world isn't absolute, therefore i would like to hear some alternative......to offset my reasoning.

Thank for the informative reply wirenut1110

rgsgww

What speedy means is that, why would you run romex in conduit instead of separate conductors.

Unless your just sleeving the romex through conduit...

nap

don't the current codes prohibit running NM in conduit except for a protective nipple?

rgsgww

I don't think it doesn't. Point is, why? You could need a larger conduit than if you were running separate conductors.

You can sleeve it through conduit for physical protection, in this situation, fill doesn't apply.

GoyimPersuasion

Yes the plan was to just sleeve the 6/3, if i could find 4/3 i would do the same, but none is available in my area so for it i am going with 4awg Thhn. Any sources for finding #4/3?

You suggestion is instead of using romex 6/3 just use 6awg Thhn? Can sub Thhn-feeds share the same conduit? Any other consideration using this configuration? Thanks

nap

I would need to look in my '08 NEC (and of course that would need to be the applicable code in the OP's situation) but I seem to remember other pro's pointing this out. I don;t do resi so it isn't a big point to remember for me.

Not sure how far OP is considering running the NM in conduit and I believe a protective sleeve does not include an actual conduit run (even though it may be very short) If the conduit were connecting 2 boxes or such, I do not believe it would be considered merely a protective sleeve and therefor not allowed under the protective sleeve situation. (seems to be the situation the OP is suggesting)

Scuba_Dave

Where are you located?

jamiedolan

This is my understanding / interpretation as well. I belive what he is proposing is a violation.
Jamie

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Jamie Dolan - Neenah, WI

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Plumbvoltage

http://www.wesbellwireandcable.com/ROMEXNMB.html

Scuba_Dave

I looked at conduit fill, from what I see a 2" conduit would work

6-3 .3318 (around a #4/0 for fill)
(3) #4
(1) #8 - ground?
Comes out to a 1.5" conduit

I still wouldn't run it, unless maybe I had the wire
With THHN it comes out to 1.25"
The bigger the conduit the more $$ all the fittings are

rgsgww

What I mean is that, if the conduit only is used lets say, down a concrete wall, from romex to romex than that is sleeving. If it is an actual connection from box to box, than fill does come to play.

I would just pull separate conductors, it is easy as that.

nap

I agree 100%.