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#99442 - 09/07/05 06:36 PM 250.64  
markp  Offline
Member
Joined: Apr 2004
Posts: 60
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).]


Mark
Kent, WA

2017 / 2014 NEC & Related Books and Study Guides

#99443 - 09/07/05 06:38 PM Re: 250.64  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Thats a great catch! Nicely done!


Ryan Jackson,
Salt Lake City

#99444 - 09/07/05 10:15 PM Re: 250.64  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,099
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"


Greg Fretwell

#99445 - 11/04/05 02:05 PM Re: 250.64  
Helectric  Offline
Member
Joined: Jan 2005
Posts: 90
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.


#99446 - 11/04/05 04:13 PM Re: 250.64  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
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...


#99447 - 11/04/05 05:57 PM Re: 250.64  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,099
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.


Greg Fretwell

#99448 - 11/04/05 06:16 PM Re: 250.64  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
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...


#99449 - 11/04/05 07:02 PM Re: 250.64  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,099
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.


Greg Fretwell

#99450 - 11/06/05 02:24 AM Re: 250.64  
Paulp  Offline
Junior Member
Joined: Nov 2005
Posts: 7
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.


#99451 - 11/06/05 03:48 AM Re: 250.64  
dmattox  Offline
Member
Joined: Oct 2004
Posts: 265
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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