Local inspector failed job because I striped Romex and changed over to flexible nonmetallic conduit for a few feet to an AC Disconnect. He stated the insulation value of romex can never be installed in conduit or flexible conduit. My question was to him “that means every electrician that puts a plug on a concrete wall of a basement with a change over connector and a 4’ piece of emt to a mulbury is in violation and he said yes. That would mean every change over connection is against code, find that hard to believe. Thanks in advance for your opinion....
Can you strip romex and use changeover with small length of conduit
- Thread starter Gametime
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
The conductors in the NM do not have any markings and other than at the point of terminations, cannot be used without the outer jacket.
ptonsparky
Tom
- Occupation
- EC - retired
Sleeve the NM complete. Do not strip it out.
NM, in a wet location, conduit or not, is not allowed.
eta: 334.12(B)(5)
NM, in a wet location, conduit or not, is not allowed.
eta: 334.12(B)(5)
Last edited:
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
The conductors inside NM aren't THWN. They may look like it but they are not, so they can't be used like you would use THWN inside conduit.
-Hal
-Hal
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Some are wondering, I wii ask for them, how is it we can use stripped NM in a panel board?
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
You are both wrong on some things. Here is the deal (some of this has been stated by others, bit just summarizing:
1. NM Inners are not marked as required and we don't even know what they are, so you cant use them as single conductors. Yes we have to strip it in panelboards and in boxes to terminate, but you have to draw the line somewhere.
2. NM cannot be used in damp locations and an exterior raceway is a damp location. You didn't specifically say this was outside but I am assuming it is.
3. NM CAN be used in an exterior box. The restriction in #2 is for raceways.
4. NM can be installed in conduit in dry locations as long as fill is met.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The bold is flat out incorrect. As Jusme stated conduit is permitted to be used for the protection of NM cable.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Ok, lets clarify this again.
You CANNOT strip NM and run the conductors through conduit. Period.
You can SLEEVE NM with conduit as long as it isn't a damp or wet location. With reference to the above quote: If you ran your NM through the "change over" connector down the conduit to the box WITHOUT STRIPPING IT until you got to the box it would comply.
Matter of fact most of us don't even use a squeeze connector (what you refer to as a changeover connector at the top.) We just slide the NM through the EMT and butt it against the NM connector at the top of the box.
-Hal
Last edited:
I think the inspector should have cited 310.8
I'll add that I have seen older 'snake skin' romex that has the required markings and has '600V TW' printed on the conductors or something like that
I'll add that I have seen older 'snake skin' romex that has the required markings and has '600V TW' printed on the conductors or something like that
mulbury is not a term I have herd before is that a 4S box?
Mulberry is a manufacturer of various metal boxes, covers and conduit bodies.
He’s probably referring to what many call a “bell box.”
Mulberry makes boxes & covers
mulberrymetal.com
(also see 314.17 for NM cable entering metal boxes_)
Weatherproof Archives - Mulberry Metal
mulberrymetal.com
(also see 314.17 for NM cable entering metal boxes_)
- Location
- New Jersey
- Occupation
- Journeyman Electrician
A Mulberry cover is used for exposed 4" and 4 11/16" boxes.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
It's what we call here a "raised industrial cover". True, it's what is used on a 4 Sq box and Mulberry is just a brand.
- Location
- Illinois
- Occupation
- retired electrician
And in my area it is called a "Garvin" cover...another brand name for the raised cover.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Maybe someone should ask the CMP to allow a short length of stripped Romex. Say < 6 feet.
- Location
- Illinois
- Occupation
- retired electrician
There would be plenty of time to work up a PI for the 2026 code. The system should be open for public inputs for the 2026 code sometime in the fall of 2022.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
what would the point be. it would be rejected.
I had an inspector site me for the same thing. He stated that the ground wire needs insulation inside a conduit & that stripping sheathing off leaves a bare ground wire. We had to jbox and run an insulated ground wire then he passed it.
- Status