What wiring codes say about these wires?

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There are several reasons to mark a white wire in a building wiring system. One of those reasons is that the building has two or more different voltage systems. Since you've already said that this cable comes from a lighting panel there is a definite possibility that the cable carries 480/277 volt power.
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Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
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On Mon, 14 May 2007 19:27:15 GMT, "Tom Horne, Electrician"

Typically red/black/blue/white is used for 3 phase wye 208v 3 Phase center tapped delta 240v requires that the "high leg" be orange and they usually would not bring the neutral into a box with the high leg present. 480v 3p wye is usually going to be using brown orange and yellow and when they do split off a 277v L/N circuit they will use violet (hot)and grey(neutral). That is the normal convention but the only things specified in the NEC is the white or grey for neutral, green, green/yellow stripe or bare for ground and orange for the high leg of a center tapped delta. Any other color is legal for a hot. You can see why they came up with the convention and any real electrician will follow it. Anything else signs your work "hack"
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Obtaining type MC cable in the 480/277 volt color scheme requires a special order of a minimum quantity made well in advance in most places. It is not a stock item in many supply houses. What many larger supply house chains do stock at their distribution centers is the white, black, red blue, green type MC with a colored tracer on the white. The code does not require a continuous color for marking different voltages. It only requires that in the case of different voltage systems each one must be marked and the marking scheme must be displayed at the panels. As that requirement is of relatively recent adoption there are millions of unmarked high voltage extensions in use that use the stock MC color scheme.
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Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
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On Mon, 14 May 2007 19:27:15 GMT, "Tom Horne, Electrician"

That means when the OP hooks up the vacuum, it will really suck.

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wrote:

That is funny. :)
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Briefly.
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Regards,
Doug Miller (alphageek at milmac dot com)
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Doug I will admit to having done that 480/277 208/120 volt mix up on purpose on one job. The Terrazzo tile guys had a boom box that was so large and so heavy that it needed it's own cart to bring it on the job. They were asked several times to turn down the radio and they would not. So over night a double pole, double throw switch was set up to the one outlet they were using and their radio emitted a very brief loud shriek. The the switch was thrown back to the 120 volt position immediately and it's interlock cover was locked. They complained very loudly but they had been warned repeatedly that the building outlets had not been excepted by the GC yet and were not available for use. They just hadn't gone to the trouble of stretching out an extension cord. Scratch one huge boom box.
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Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
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We were on a job with an annoying boom box once. The superintendent kicked it down an elevator shaft.
On Tue, 15 May 2007 18:50:59 GMT, "Tom Horne, Electrician"

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we had this one guy at a car dealership where I worked that would regularly smoke his lunch and then put on the wildest assed "music" you can imagine every afternoon. His boom box cord was made up almost entirely of red butt connectors. Finally one day, I snipped it flush with the box.
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Steve Barker




"Terry" < snipped-for-privacy@charter.net> wrote in message
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jJim McLaughlin wrote:

Looking closer at those photos, the white has both red and blue tracer threads on the insulation jacket. Very wierd.
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