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#11264 - 07/06/02 03:34 PM CT bond
Cindy Offline
Member

Registered: 06/23/01
Posts: 196
Loc: PDX, OR, US
utility's service lateral lands in a remote ct-can where there wasn't room to put the service equipment. the gc lands on a lug with the gc going out to the service enclosure with the main disconnect. we put a supplementary ge at the ct-can [ct-can is not the service equipment, 230.66, i assume applies to ct-cans as well]. the ct-can is bonded to the gc's and to the ge, 250.92.
the gc from the ct-can to the service gc lug will act as the bonding conductor between ge's. it was suggested to me that the ge bond between this supplementary ge and the service ge had to be exterior from ge to ge and not by using the gc from the ct-can to the service. i'm sticking with my gc/ge bond unless someone tells me why i can't to it this way.
another question is if you can consider this a supplemental ge vs supplementary, and use it as the 2nd ge? didn't need to here, but i'm not sure why it couldn't be used. the ge's are tied together with the same idea of putting all the metal equipment at the same potential with a low impedance ground fault path, that seems to me to be improved here.

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#11265 - 07/06/02 05:32 PM Re: CT bond
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Cindy, can you clarify lands in. Typically service conductors only pass through a CT. Maybe I'm missing something.

The GEC can be made here, and any bonding can be here or down line.

The GEC must be be made at, or before the service main disconect.


After this the main bonding jumper takes care of the EGC.

Your statement of supplementary 2nd GEC has me confused.

To be honest I'm quite confused and probably confusing you more. SORRY.

Roger

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#11266 - 07/06/02 06:14 PM Re: CT bond
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Roger— Monor aside about "...pass through a CT"—some utilities call for a mounting base and furnish bar-type CTs. Others use window/donut versions like you describe.

{There is more than one way to skin a cat.} The difference probably shouldn’t change NEC grounding/bonding requirements.

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#11267 - 07/06/02 06:44 PM Re: CT bond
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Bjarney, thanks for the info. I guess we get use to the norm.

I'm still confused to some of the of the grounding terms and methods Cindy explained.


Roger

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#11268 - 07/07/02 07:52 PM Re: CT bond
Cindy Offline
Member

Registered: 06/23/01
Posts: 196
Loc: PDX, OR, US
sometimes i write like i talk, too fast and jumbled, so i'll separate things to help maybe.

this is a bussed c.t. enclosure with lugs for line and load built-in

utility gc is connected to ct-can bus lug

gc to disco is connected to ct-can bus lug

gec from ge is connected to ct-can bus lug

this "first" ge is located at the ct-can and i called it supplementary because i didn't really need it to meet nec ge requirements since i have other ge's at the service disco

guess my understanding is that we call these ge's supplementary if they are used for things like limited energy grounds or remote ge's for utility, or others not nec mandated

so thought i'd ask if you'all see it the same way ---- then i was thinking that it seems "legal" and "tc" [theoretically correct] to be able to use the ct-can ge as the required supplement"al" ge if desired

also thought that the "gc" from the ct-can to the service disco gc bus lug should be "legal" and "tc" to act as the "gec" so it should be ok to use it as the supplement"al" vs supplement"ary" ge connected by this "gc/gec bonding conductor"

supplemental ge's are supposed to be connected to the ge-system, like for limited energy systems, but there isn't a gec to these that's sized to do the job so they are added, but with a ge that is located ahead of the service, there is a large enough conductor that is "tc" to use as the gec, and that's the gc going to the same place as the gec would be going if separate...... i feel like i'm starting to ramble on and repeat myself so if you don't get it, i don't know how to describe it right

no big deal, i'm probably wrong, but has anybody ever had to run a 100 foot ge bond from a service to a remote ct/meter at a pole for a utility? not me. i've connected the ge at the pole to the gec and tied into the gc and the only tie to the service ge-system is through the gc from the pole..... rambling again, bye

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#11269 - 07/08/02 05:17 AM Re: CT bond
electric-ed Offline
Member

Registered: 07/08/02
Posts: 184
Loc: Canada
Cindy,
Your post would be much easier to understand if you would take the time to type out words instead of using abbreviations that are not universally used.

Ed

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#11270 - 07/08/02 08:35 PM Re: CT bond
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Easy killer...

Actually, the members here at ECN have sort-of unofficially adopted some shortcuts to make it faster/easier/more efficient when posting.

What I'm trying to say is, Cindy is a whole lot less to blame than say myself, "sparky" (Steve), or Bill. I mean no harm or disrespect, but Cindy has merely been following sort of a tradition started by some of us others, and it has become sort-of "universal" to us.

Go here for a brief synopsis of abbreviated and otherwise shortened terms we are likely to use here.

Case-in-point: Since one is likely to draw remarks from saying things like "neutral" or "ground" we shorten the "true" names of "grounded conductor" to gc and "equipment grounding conductor" to egc.

"gc" can also be used to mean "general contractor", so context must be noticed as well for some of them.

Hope this helps...

Maybe we need a Frequently Asked Questions as well as a Glossary?

Hint, hint...

_________________________
-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

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#11271 - 07/09/02 09:58 AM Re: CT bond
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Cindy, to the best of my understanding, there is nothing wrong with your installation. Do not forget your bonding jumpers in both enclosures and conduit if this is metalic conduit. The easiest way to characterize what you are doing would be to think of suppling an out building and follow the requirements of 250.32. Hi Ed, Nice too see you here.

Roger

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#11272 - 07/09/02 01:42 PM Re: CT bond
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
sparky66wv,

Instead of a Glossary I was thinking more like a "Decoder Ring" ... That would be something!

No, seriously, I think that some slang terms and abbreviations are sure to come about amongst people that get together a lot but it is still important that comments be easily understood by everyone so that additional explanation is not necessary.

Bill

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#11273 - 07/09/02 08:08 PM Re: CT bond
Cindy Offline
Member

Registered: 06/23/01
Posts: 196
Loc: PDX, OR, US
opps sorry, what i meant to say was:
gc = grounded conductor
ge = grounding electrode
gec = grounding electrode conductor
ct-can = current transformer enclosure

i suppose it would be pc, politically correct to make them obvious first time i use them in a thread.

thread = not what you sew with.

anyway roger, thanks for the wf, warm fuzzy.

wf = comment that inspires confidence in installation.

so bill, can we add mine to the decoder ring?

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