my foreman told me i couldnt use any flex in my groundig electrode for transformer. i changed from emt to flex when i came off the wall probaly 3 ft. the code says i can go up to six feet in flex with listed fitting. and i used a grnd bushing.if this were true why do they sell flex covered ground for residential.please reference 1999nec or 2002 since I'm in California. thanx
insulated groundindig electrode in steel flex
- Thread starter kevinnye
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hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: insulated groundindig electrode in steel flex
And since FMC is not in the list of wiring methods from 250.64(B) then it is not allowed just because of the statement "it shall be in" in that section.
And by the way: Yes you can get single conductor AC cable, even if it doesn't seem like it is a cable because of only one conductor it is a UL listed cable.
[ November 23, 2005, 08:34 PM: Message edited by: hurk27 ]
When I was giged for this I thought "cable armor" was FMC, But was told by members of this forum that FMC is not cable armor it is a raceway, and the wire installed in it is not a cable for it to be the armor for. Cable armor is the outer sheathing of a cable assembly like AC cable, MC cable, MI cable ETC...
And since FMC is not in the list of wiring methods from 250.64(B) then it is not allowed just because of the statement "it shall be in" in that section.
And by the way: Yes you can get single conductor AC cable, even if it doesn't seem like it is a cable because of only one conductor it is a UL listed cable.
[ November 23, 2005, 08:34 PM: Message edited by: hurk27 ]
Re: insulated groundindig electrode in steel flex
imho, you are mixing the rules of (B) and (E)..FMC is a metallic receway and (E) requires bonding of metallic raceways...
with that said, i'll bow out and let others speak.,.. you have my opinion.
imho, you are mixing the rules of (B) and (E)..FMC is a metallic receway and (E) requires bonding of metallic raceways...
with that said, i'll bow out and let others speak.,.. you have my opinion.
- Location
- Windsor, CO NEC: 2023
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- Hospital Master Electrician
Re: insulated groundindig electrode in steel flex
Augie,
I think Wayne's right. There is a specific list of allowable raceways, FMT didn't make the list. While (E) mentions metallic raceways, so does (B), only in a more specific manner. You have to enforce (B) even though (E) doesn't name names.
Rigid nonmetallic conduit is mentioned in (B). Although common sense would dictate that we don't need to bond non-conductive raceways, it's not a sin for (E) to only make mention of the metallic options.
Augie,
I think Wayne's right. There is a specific list of allowable raceways, FMT didn't make the list. While (E) mentions metallic raceways, so does (B), only in a more specific manner. You have to enforce (B) even though (E) doesn't name names.
Rigid nonmetallic conduit is mentioned in (B). Although common sense would dictate that we don't need to bond non-conductive raceways, it's not a sin for (E) to only make mention of the metallic options.
Re: insulated groundindig electrode in steel flex
so what i get out of that is iam right. in san diego where i aprenticed, you had to flex your connections to a transformer for seismic reasons and the inspector also said nothing now that im in a new county. it was just the general foremen.
so what i get out of that is iam right. in san diego where i aprenticed, you had to flex your connections to a transformer for seismic reasons and the inspector also said nothing now that im in a new county. it was just the general foremen.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: insulated groundindig electrode in steel flex
But what you missed is FMC (Flexible Metal Conduit) or (GreenField) is not allowed as that flexable connection, but AC single conductor cable is. 250.64(B) does not list FMC as one of the wireing methods allowed. FMC is a raceway, AC is a cable.
But what you missed is FMC (Flexible Metal Conduit) or (GreenField) is not allowed as that flexable connection, but AC single conductor cable is. 250.64(B) does not list FMC as one of the wireing methods allowed. FMC is a raceway, AC is a cable.
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