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Old 02-18-2012, 12:47 AM   #1
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Default White plastic EMT insulators

Up to this point, I used those Arlington white plastic insulators on the ends of my EMT if I am shoving Romex down an exposed cinderblock wall or the side of a furnace into a 4 square box (using an EMT set-screw connector w/ plastic bushing to connect to the 4 sq.)
I guess that I just went for the cheapest thing rather than using those Bridgeport EMT to Romex fittings or possibly having to install a junction box to transition from Romex to THHN.
In my own mind, I figured that as long as the Romex was attached within 12" of the white insulator, it was legal.
Then, today the supply house dropped off a replacement bag of these white insulators and I read the label. "For low voltage use only".
Every trade magazine that I have ever read has a picture of these white insulators on the Arlington product page with Romex going into EMT.

My AHJ has never commented on using the white insulators with Romex, but that manufacturer label does not leave any leeway.
Do you use white insulators, EMT connectors with plastic bushings or those EMT-to-Romex fittings?
If you do use those fittings, do you strip the jacket off the Romex before you shove it down the EMT?
Thanks,
Rick
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Old 02-18-2012, 12:50 AM   #2
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Quote:
Originally Posted by subelect View Post
........ do you strip the jacket off the Romex before you shove it down the EMT?.........
Doing so is a violation.
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Old 02-18-2012, 12:53 AM   #3
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I see no special requirement that you use a bushing at all when you're sleeving for protection. If you go one step better and install a bang on bushing (like probably most of us do), then good for you.
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Old 02-18-2012, 01:10 AM   #4
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http://www.aifittings.com/products/s...eets/emt50.pdf
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Old 02-18-2012, 01:39 AM   #5
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By all rights romex is low voltage.
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Old 02-18-2012, 02:31 AM   #6
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Only issue I can see is does the EMT get bonded?
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Old 02-18-2012, 02:33 AM   #7
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Only issue I can see is does the EMT get bonded?
You're going on the assumption that it needs to be. Sleeving for protection is not a conduit system.
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Old 02-18-2012, 02:45 AM   #8
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You're going on the assumption that it needs to be. Sleeving for protection is not a conduit system.
But likely to be energized comes into play..
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Old 02-18-2012, 09:39 AM   #9
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334.15 (C). It needs a bushing. I use those bang-on's all of the time, an inspector told me to use those rather than the romex to emt fitting. I always ground the emt/box with a ground screw. If the emt is just a sleeve without any box or device, it does not need to be grounded per 250.86 ex 2
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Old 02-18-2012, 11:22 AM   #10
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Originally Posted by mbednarik View Post
334.15 (C). It needs a bushing. I use those bang-on's all of the time, an inspector told me to use those rather than the romex to emt fitting. I always ground the emt/box with a ground screw. If the emt is just a sleeve without any box or device, it does not need to be grounded per 250.86 ex 2

You can't use Ex. 2 alone. It must comply with 1, 3 and 4 as well. It also applies only to existing circuits.

If you install the circuit and it is has a grounding conductor, you must ground the raceway.
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Old 02-18-2012, 12:09 PM   #11
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Quote:
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You can't use Ex. 2 alone. It must comply with 1, 3 and 4 as well. It also applies only to existing circuits.

If you install the circuit and it is has a grounding conductor, you must ground the raceway.
Sure you can use Exception 2 alone. Exception 1 and Exception 3
have nothing to do with Exception 2.

You seem to be conflating the 4 parts necessary to use Exception 1 with
the completely separate Exception 2.
Quote:
Exception No. 1: Metal enclosures and raceways for conductors added to existing installations of open wire, knob-and-tube wiring, and nonmetallic-sheathed cable shall not be required to be connected to the equipment grounding conductor where these enclosures or wiring methods comply with (1) through (4) as follows:
(1) Do not provide an equipment ground
(2) Are in runs of less than 7.5 m (25 ft)
(3) Are free from probable contact with ground, grounded metal, metal lath, or other conductive material
(4) Are guarded against contact by persons
Exception No. 2: Short sections of metal enclosures or raceways used to provide support or protection of cable assemblies from physical damage shall not be required to be connected to the equipment grounding conductor. See related ROP
Exception No. 3: A metal elbow shall not be required to be connected to the equipment grounding conductor where it is installed in a nonmetallic raceway and is isolated from possible contact by a minimum cover of 450 mm (18 in.) to any part of the elbow or is encased in not less than 50 mm (2 in.) of concrete.
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Old 02-18-2012, 12:27 PM   #12
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Sure you can use Exception 2 alone. Exception 1 and Exception 3
have nothing to do with Exception 2.

You seem to be conflating the 4 parts necessary to use Exception 1 with
the completely separate Exception 2.

Uh, try again.

Quote:
.... comply with (1) through (4) as follows: ...
Not any or some or one of them, all of them.
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Old 02-18-2012, 12:57 PM   #13
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Quote:
Originally Posted by 480sparky View Post
Uh, try again.



Not any or some or one of them, all of them.
Items 1 THROUGH 4 refer to exception 1 only. Exception 2 is a stand alone rule.

Last edited by buzzbar; 02-18-2012 at 12:58 PM. Reason: Typo
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Old 02-18-2012, 01:01 PM   #14
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Quote:
Originally Posted by 480sparky View Post
Uh, try again.



Not any or some or one of them, all of them.
OK, I'll try again.

The following:
Quote:
.... comply with (1) through (4) as follows: ...
is part of Exception 1. It is not part of Exception 2.

Exception 2 stands on its own independent of Exception 1.
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Old 02-18-2012, 01:07 PM   #15
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Quote:
Originally Posted by rexowner View Post
OK, I'll try again.

The following:

is part of Exception 1. It is not part of Exception 2.

Exception 2 stands on its own independent of Exception 1.

Now I see the confusion. I'm referring to 250.86 Ex 1 (2), and you're referring to 250.86 Ex. 2.
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Old 02-18-2012, 01:28 PM   #16
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I wouldn't lose any sleep over it.
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Old 02-18-2012, 02:23 PM   #17
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I usually run 3/4" EMT into a 4 square, with an RS cover that meets the requirements of 250, then I bond to the outlet/switch/GFCI ground screw.
I used to also bond the Romex's grd wire to a green screw in the 4 square, but you don't gain anything by double bonding and it wastes time/labor.

Thanks for the replies,
Rick
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Old 02-18-2012, 04:31 PM   #18
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From the PDF in Techy's link: (Bold underline added by me.)

Quote:
Uses include power, computer data lines, cable TV, audio/video cable, phone/modem or alarm/security systems. (AND) Meets 2008 NEC requirements for 300-15(c) protection.
So I see no problem at all using them on conduit used to protect Romex. No violation.

And 480, I agree with rexowners' interpretation. Unless the Code states specifically that EXCEPTIONS 1-3 ALL must be complied with, each exception stands alone. But you are right in that if you are trying to apply Exception 1 only, then all four conditions that follow MUST be met. Edit: Whoops, just saw post #15..so I have restated what you already said. My bad.
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