Can anyone tell me what are the listed cables with acceptable ground return paths are. As it is referred to in 517.13. Haven't received my copy of 2002 yet and I have to plan installations for the year year.
The Code does not list cables as being approved or not. It only (517.13) requires that: "The metal raceway system, or cable armor, or sheath assembly shall itself qualify as an equipment grounding return path in accordance with 250.118." The cable's listing is what will determine its acceptability Although they mention A/C, M/C, & M/I cable, the only one I know of is A/C for your useage. This is nearly a repeat of the Q you already asked in another section of the BB. Check there
[This message has been edited by electure (edited 11-11-2001).]
Re: nec2002 250.118#78913 11/11/0109:04 AM11/11/0109:04 AM
Here is the exact reference from the new 2002 NEC. What part of this is not clear or understood?
And here is what the 2002 NEC says in 250.118 (11) Type MC cable where listed and identified for grounding in accordance with the following: a. The combined metallic sheath and grounding conductor of interlocked metal tape type MC cable
b. The metallic sheath or the combined metallic sheath and grounding conductors of the smooth or corrugated tube type MC cable
[This message has been edited by Joe Tedesco (edited 11-11-2001).]
Joe, My point is that MC cable that is listed as an EGC per 250.118(11)(a) is not suitable for 517.13 installations because the sheath istself does not qualify as an EGC. It only qualifies when combined with the internal grounding conductor, and therefore does not meet the requirements of 517.13. Don(resqcapt19)
Joe, Do you know a company that has type MC or MI Cable that meets the requirements? (Come on, now!) What part don't you understand? My concern is that if Mr Gardiner specs a freak, it will be a long lead-time item, and will not be acceptable when his EC gets it. Use AFC's type AC-HCF (as Nick said) or an approved equal, and you can put it to bed.