NM on Block wall

[bth0mas20]

In the past when wiring in a residential garage with a block wall up to about 9 ft I will sleeve the romex in pvc conduit just till it reaches the rafters.

How do you usually do this......strap nm to block wall or sleeve in pvc.

Some will say that you can run nm in pvc. Ive never had a problem with inspectors....probally because its inside the building.

Just currious what others do.

 

[stickboy1375]

I will either use emt as a sleeve, or just shoot a 2x4 to the wall and staple to the face of it.

 

[bjp_ne_elec]

I've often wondered this about "sleeving" with EMT - and I know they actually make a connector that is Romex on one side, 1/2" EMT with set screw. But don't you have to consider cross section of the whole cable. Can you legally put a 12/2 in a 1/2" piece of EMT?r

 

[Dennis Alwon]

I've often wondered this about "sleeving" with EMT - and I know they actually make a connector that is Romex on one side, 1/2" EMT with set screw. But don't you have to consider cross section of the whole cable. Can you legally put a 12/2 in a 1/2" piece of EMT?r

Where have you been hiding?

Yes you can sleeve NM in a piece of emt. The fill does not come into effect because it is not a complete raceway, it is a sleeve. IMO

There is also nothing wrong with sleeving NM in PVC-- that is my preferred method. Use a TA (connector with a bushing on top or usually I just use a coupling since it has soft rounded edges.

 

[wbalsam1]

I've often wondered this about "sleeving" with EMT - and I know they actually make a connector that is Romex on one side, 1/2" EMT with set screw. But don't you have to consider cross section of the whole cable. Can you legally put a 12/2 in a 1/2" piece of EMT?r

See 358.22.
Chapter 9 Table 1 Note 9 dictates that a cable shall be counted as a single conductor for calculating % of conduit fill...53%.
12/2 NM = 0.322 in. diameter. To convert to sq in, diameter squared times 0.7854
0.322 X 0.322 = 0.103684 X 0.7854 = 0.0814334
Maximum 1/2 trade size emt at 53% = 0.131
So, it's OK.

 

[mivey]

I would use emt.

 

[mivey]

See 358.22.
Chapter 9 Table 1 Note 9 dictates that a cable shall be counted as a single conductor for calculating % of conduit fill...53%.
12/2 NM = 0.322 in. diameter. To convert to sq in, diameter squared times 0.7854
0.322 X 0.322 = 0.103684 X 0.7854 = 0.0814334
Maximum 1/2 trade size emt at 53% = 0.131
So, it's OK.

It is ok because of dennis's post #4

 

[blue spark]

I was told by my inspector that sleeving in EMT will not be allowed in the 08 code. I have not yet gotten the 08 book. If this is true, I think it's ridiculous.

 

[wbalsam1]

It is ok because of dennis's post #4

If the conduit length was over 24", of which these types of installations usually are, then why wouldn't 300.17 and 358.22 come into play? :smile:

 

[haskindm]

I believe your inspector is misinformed....

 

[mivey]

If the conduit length was over 24", of which these types of installations usually are, then why wouldn't 300.17 and 358.22 come into play? :smile:

I think the premise is that for this purpose, it is not a raceway, and those sections apply to raceways. This has to have been debated somewhere here before. Does anyone have the results of a prior debate? I'll do a search in the meantime.

 

[ultramegabob]

Is the garage attached or detached, is PVC permited for use inside of dwellings?

 

[Dennis Alwon]

Is the garage attached or detached, is PVC permited for use inside of dwellings?

Yes-- it's no more toxic than NM cable.

 

[stickboy1375]

is PVC permited for use inside of dwellings?

The question is, Is pvc NOT permitted in dwellings. :wink:

 

[ultramegabob]

Yes-- it's no more toxic than NM cable.

I guess they use alot of PVC for plumbing now that I think about it:smile:

 

[nakulak]

why use nm when you can use thhn, a much better grade of conductor ? (I mean, if you're gonna pipe it, pipe it !)

 

[Dennis Alwon]

why use nm when you can use thhn, a much better grade of conductor ? (I mean, if you're gonna pipe it, pipe it !)

We are talking residential and all you want to do is sleeve the nm where it is exposed on a block wall. Why run conduit thru joists etc if you don't have to. Unless you live in Chicago and probably a few other big cities, NM cable is what is used.

 

[nakulak]

sleeved romex - looks like crap.

all pipe, looks nice and professional.

 

[c2500]

sleeved romex - looks like crap.

all pipe, looks nice and professional.

That may be, but around here you would be out of business because you would not be able to compete with those running that crappy sleeved NM.

c2500

 

[stickboy1375]

sleeved romex - looks like crap.

all pipe, looks nice and professional.

Who cares? I'm not taking a picture of it and hanging it over my fireplace... :roll:

You pipe guys kill me... Besides ALL that, once they insulate you dont see the crappy NM anyhow...