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Joined: Apr 2004
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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
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Thats a great catch! Nicely done!
Ryan Jackson,
Salt Lake City
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"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
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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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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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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
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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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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
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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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Joined: Oct 2004
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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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