And now we look at the definition of raceway.Last sentence in 334.30 - "Sections of cable protected from physical damage by raceway shall not be required to be secured within the raceway"
Roger
And now we look at the definition of raceway.Last sentence in 334.30 - "Sections of cable protected from physical damage by raceway shall not be required to be secured within the raceway"
I think this is one of those rules where it was meant as an example. It would make no sense otherwise. I have never seen an inspector who would only allow that type of install in a basement
some people will interpret the end of that "protective sleeve" to be the equivalent of a box cabinet or fitting and require securing it within 12 inches per 334.30. I do find error in that drawing by calling it a raceway when it should be called a "protective sleeve" or something similar. It may be made out of something that is listed as a raceway but it is not used in accordance to raceway articles in this case. 300.18(A) tells us that raceways "shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors".
Ok, if it makes everybody feel better let's just apply 300.12 Exception No 1 for this scenario. Take note that it uses the term " short sections of raceways"I agree, I fail to see how that is complete.
Ok, if it makes everybody feel better let's just apply 300.12 Exception No 1 for this scenario. Take note that it uses the term " short sections of raceways"
Roger
I think what Don is saying, and how I feel as well is that the requirement for the sheath to extend into the box only applies to a box on the wall of a unfinished basement and not every time NM is running a raceway.
Crazy but that is how the NEC evolved.
In the illustration, it looks like the NM is stapled within 12" of the point where it enters the raceway, although there is no dimension callout for that distance.some people will interpret the end of that "protective sleeve" to be the equivalent of a box cabinet or fitting and require securing it within 12 inches per 334.30. I do find error in that drawing by calling it a raceway when it should be called a "protective sleeve" or something similar. It may be made out of something that is listed as a raceway but it is not used in accordance to raceway articles in this case. 300.18(A) tells us that raceways "shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors".
And there is some kind of protective bushing where the NM enters the cut end of the conduit.
I understood that but I have no idea why it was written that way. .
I agree, I fail to see how that is complete.
(C) Cables. Where cable is used, each cable shall be secured to the cabinet, cutout box, or meter socket enclosure.
Exception: Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 450 mm (18 in.) and not more than 3.0 m (10 ft) in length, provided all of the following conditions are met:
(a) Each cable is fastened within 300 mm (12 in.), measured along the sheath, of the outer end of the raceway.
(b) The raceway extends directly above the enclosure and does not penetrate a structural ceiling.
(c) A fitting is provided on each end of the raceway to protect the cable(s) from abrasion and the fittings remain accessible after installation.
(d) The raceway is sealed or plugged at the outer end using approved means so as to prevent access to the enclo-sure through the raceway.
(e) The cable sheath is continuous through the race-way and extends into the enclosure beyond the fitting not less than 6 mm (1?4 in.).
(f) The raceway is fastened at its outer end and at other points in accordance with the applicable article.
(g) Where installed as conduit or tubing, the allowable cable fill does not exceed that permitted for complete con-duit or tubing systems by Table 1 of Chapter 9 of this Code and all applicable notes thereto.
No...I am saying, based on the code wording, the only time you can protect the NM with a conduit or tubing sleeve is when the sleeve is installed on a basement wall.I think what Don is saying, and how I feel as well is that the requirement for the sheath to extend into the box only applies to a box on the wall of a unfinished basement and not every time NM is running a raceway.
Crazy but that is how the NEC evolved.
No...I am saying, based on the code wording, the only time you can protect the NM with a conduit or tubing sleeve is when the sleeve is installed on a basement wall.
If I am sleeving with PVC I have always just reamed the end of the end of the PVC and used no additional fittings.Around here we sleeve with PVC and just use a pvc coupling at the top of the pipe.
No...I am saying, based on the code wording, the only time you can protect the NM with a conduit or tubing sleeve is when the sleeve is installed on a basement wall.
Per the style manual the term "shall be permitted" acts as an exception. In my opinion 334.15(C) acts as an exception to 314.17(B) & (C) and to 334.30. When you install NM in a sleeve that connects to a box, you cannot comply with the rules in 314.17 or 334.30, so the exception is needed. The exception, 334.15(C), is very specific as to its application.How so?
Per the style manual the term "shall be permitted" acts as an exception. In my opinion 334.15(C) acts as an exception to 314.17(B) & (C) and to 334.30. When you install NM in a sleeve that connects to a box, you cannot comply with the rules in 314.17 or 334.30, so the exception is needed. The exception, 334.15(C), is very specific as to its application.
Just for clarification, it is not basements in general. It is even more specific: unfinished basements and crawl spaces.I agree that 334.15(C) is very specific however there are other areas of the code that allow nm to be sleeved in a raceway. I really don't know but I have a feeling that section was not meant to be just for basements as that would make no sense at all
Just for clarification, it is not basements in general. It is even more specific: unfinished basements and crawl spaces.
And I'll bet you and your inspectors are but a fractional percentage of others that have too.... I bet I have violated this many times, and inspectors have passed it many times also.
No...I am saying, based on the code wording, the only time you can protect the NM with a conduit or tubing sleeve is when the sleeve is installed on a basement wall.