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#99442 - 09/07/05 03:36 PM 250.64
markp Offline
Member
Registered: 04/12/04
Posts: 60
Loc: Kent, WA, USA
Has anyone noticed the subtle deletion of "severe" from 250.64? The way I read it now, you need to protect GEC's sized 4 and larger from physical damage whereas previously it only had to be protected from severe physical damage. We may end up needing to put just about every GEC in conduit...

[This message has been edited by markp (edited 09-07-2005).]
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Mark
Kent, WA
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#99443 - 09/07/05 03:38 PM Re: 250.64
Ryan_J Offline
Moderator
Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
Thats a great catch! Nicely done!
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Ryan Jackson,
Salt Lake City
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#99444 - 09/07/05 07:15 PM Re: 250.64
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
"Exposed to physical damage" is always going to be a judgement call. This change has certainly tossed some mud in the water. Basically if you can't run the #4 without a raceway, you can't run it is PVC either because that says 352.10(F) Exposed. For exposed work where not subject to physical damage if identified for such use"
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#99445 - 11/04/05 10:05 AM Re: 250.64
Helectric Offline
Member
Registered: 01/07/05
Posts: 91
Loc: Brandon, SD
And yet 250-64(b) seems to imply that a #6 or smaller can be protected with PVC if exposed to physical damage.
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#99446 - 11/04/05 12:13 PM Re: 250.64
Dnkldorf Offline
Member
Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
Someone explain to me how a GEC Indoors, behind a transformer, going up a wall, would be exposed to physical damage?

Or for that matter, how does a GEC originating in a panel, going up to building steel, get damaged?

Dnk...
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#99447 - 11/04/05 01:57 PM Re: 250.64
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
Dnk, I think we all agree there are places where a wiring method is not subject to any physical damage. This question pertains to the difference between severe physical damage and <some other kind of> physical damage.
This is just going to be a judgement call.
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Greg Fretwell
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#99448 - 11/04/05 02:16 PM Re: 250.64
Dnkldorf Offline
Member
Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
I know G, just curious if any one has seen this happen and how.

I can't imagine how a GEC can be damaged, other than blatant negligence.

Dnk...
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#99449 - 11/04/05 03:02 PM Re: 250.64
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
Usually GECs get damaged by lawn mowers or other equipment running up next to the wall from what I see. I can't see a problem inside a building unless it is a shop or warehouse where there is some heavy material being stored against or moving by an unprotected run.
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Greg Fretwell
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#99450 - 11/05/05 10:24 PM Re: 250.64
Paulp Offline
Junior Member
Registered: 11/03/05
Posts: 7
Loc: Troutdale,Oregon,U.S
Does GEC stand for grounding equipment conductor? I am used to seing as EGC. I guess its probably which coast you live on.
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#99451 - 11/05/05 11:48 PM Re: 250.64
dmattox Offline
Member
Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
GEC = Grounding electrode conductor
EGC = Equipment grounding conductor

GEC is for connecting your grounding electrodes together to form your grounding electrode system.

EGC is the wire/conduit to bond equipment.

[This message has been edited by dmattox (edited 11-06-2005).]
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