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Joined: Feb 2002
Posts: 840
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Wirenuttt, there is new MC cable that has brown/orange/yellow markings on the jacket for 277/480.
Peter
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Joined: Oct 2000
Posts: 5,392
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try here Ange...... ![[Linked Image]](https://www.electrical-contractor.net/ubb/smile.gif)
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Joined: Apr 2001
Posts: 518
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I'm glad that using grey wire for 277v. neutrals was mentioned...As I read the 2002, this is no longer allowed! (One of the things I don't like).
This is a broader subject, however. When you "share" neutrals between circuits, it can be difficult at the panel to identify the other circuits that share a neutral.
When you are running isolated ground circuits for data processing circuits, it makes sense to have separate neutrals for each circuit, so that there are fewer ways for one circuit to "dirty" the power on another circuit.
I expect that marking our wires, etc., will become even more important with time.
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Joined: Nov 2000
Posts: 2,148
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John,
Why can't you use grey for 277 volt neutrals? Please cite the section. Thanks.
Don
Don(resqcapt19)
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Joined: Mar 2002
Posts: 53
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iwire,
The rec't. scenario I mentioned was just throwing out "what-if's". And, no you could not detect any difference with any tester.
But, I have had homeowners see a apprentice using the plug-in and ask why. Then the assumption on their part is that is the only thing they need to be a pseudo electrician was the plug-in to do electrical inspections.
I have had quite a few 2 year apprentices come on board that have no clue as to how to use a "wiggy", or any other kind of tester for that matter. Now I have suspicions as to whether they actually tested the devices I wanted tested.
We would start guys out with voltage meters only, then they could graduate into a continuity tester. This is always a challenge for them as well as myself.
You gotta admit though, we all look really COOL with a used "wiggy" hanging around our necks, official and all, yea, a JOURNEYMAN kinda COOL!
Sorry for the rec't banter!
NLL
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Joined: Oct 2002
Posts: 210
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I am surprised the lites in the plug in tester did not blow out from the 277 voltage.
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Joined: Nov 2002
Posts: 267
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spyder; That's just the point, the tester is rated for 600 volts. ~Ange ct and sparky, thanx ![[Linked Image]](https://www.electrical-contractor.net/ubb/cool.gif)
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Joined: Jan 2003
Posts: 4,391
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NLL, you can't beat the look of the wiggys!
The company I work for goes the oppisite way on testers, helpers are not allowed to do testing with meters, (I know, don't jump on me I did not make the rule) The company considers this live work.
On a side note someone should make a plug in tester with audable voltage warning.
Below say 110 or above 125 and it would make a noise.
Bob
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Aug 2002
Posts: 112
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whoa!...no more gray neutral wires on 277v.?
hmmmmmm....if thats true, then i got about a million feet of gray wire i'll sell real cheap!.....:S......say it aint so!!!!
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Joined: Dec 2000
Posts: 4,294
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The only references I can find to the "grey" wire is that conductors larger than #6 cannot be field identified at the terminations with grey, but must use white...and that's not new.
Also, there's a FPN that warns of the use in the past as an ungrounded conductor.(although I can't find any prohibition of its use as such in the present)
The word "natural" (as in natural grey) was removed.
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