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Old 08-18-2009, 09:23 PM   #1
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Are A & B ever marked


For single phase residential, are the utility feed wires ever marked A & B?
It shouldn't matter electrically, but I figured I'd ask anyhow.

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Old 08-18-2009, 09:31 PM   #2
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Are A & B ever marked


It's not required and certainly doen't affect function but for troubleshooting it may be useful in some cases to have markings.

Is it ever done? I am sure it is.

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Old 08-18-2009, 10:05 PM   #3
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Are A & B ever marked


I marked all my ends with red/white elec. tape... just in case
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Old 08-18-2009, 10:48 PM   #4
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Are A & B ever marked


Red and white? Seems to me that marking an A or B phase conductor with white doesn't make any sense. Should be red and black if marked. White would indicate a neutral. Am I missing something?

I'm sure there are those that do it but I rarely if ever see it done. Speaking of the work in the panel it doesn't really matter if the service entrance or feeder conductors phases are marked. One lug/buss is A and one lug/buss is B.
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Old 08-18-2009, 10:54 PM   #5
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Are A & B ever marked


For single phase, it doesn't really matter. If the wiring to the service is cable, then it is likely already marked with a red stripe on one phase, and a white stripe on the neutral. I always phase my phases and neutrals. Black for A, red for B.

On three phase, it is imperative that the phases be identified.
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Old 08-18-2009, 11:33 PM   #6
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Are A & B ever marked


Quote:
Originally Posted by thekctermite View Post
Red and white? Seems to me that marking an A or B phase conductor with white doesn't make any sense. Should be red and black if marked. White would indicate a neutral. Am I missing something?

I'm sure there are those that do it but I rarely if ever see it done. Speaking of the work in the panel it doesn't really matter if the service entrance or feeder conductors phases are marked. One lug/buss is A and one lug/buss is B.
doesn't make any sense? How about because it is illegal to mark a hot conductor with white.
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Old 08-18-2009, 11:34 PM   #7
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Are A & B ever marked


if it is just a single phase service (120/240) then you do have three conductors, red black and white, so he could be marking the red phase and the neutral, and leaving the black phase unmarked as the stuff I always use comes with black insulation anyhow, so no need to put black tape on black insulation......

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Old 08-19-2009, 07:36 AM   #8
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Are A & B ever marked


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doesn't make any sense? How about because it is illegal to mark a hot conductor with white.
Just like I said.
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Old 08-19-2009, 07:57 AM   #9
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Are A & B ever marked


Quote:
Originally Posted by johnnyboy View Post
I marked all my ends with red/white elec. tape... just in case
Makes perfect sense to me, just like BCSparkyGirl said...
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Old 08-19-2009, 10:13 AM   #10
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Are A & B ever marked


What markings are on the transformer secondary up on the pole?
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Old 08-19-2009, 10:49 AM   #11
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Are A & B ever marked


Caution : High voltage....
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Old 08-19-2009, 03:53 PM   #12
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Are A & B ever marked


Quote:
Makes perfect sense to me, just like BCSparkyGirl said...
Sheesh.....I knew what he meant too.
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Old 08-19-2009, 04:25 PM   #13
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Are A & B ever marked


Quote:
Originally Posted by thekctermite View Post
Just like I said.
I was simply pointing out that you said "it doesn't make sense".

I stated it is illegal.

While it may not make sense because it is illegal, without such clarification, we don't know if that is what you intended or not. There could have been many reasons in your head that would make you think "doesn't make sense".

and I think the confusion in the thread came from this:
Quote:
For single phase residential, are the utility feed wires ever marked A & B?
and then folks started talking about marking a wire with white.

.


How about we write a suggestion for the code that not only wire smaller than (I think) #6 be color correct for neutrals and grounds but all wire be correctly color coded the entire length.


just kidding. The job I am currently on has all wire with colored insulation and it is nice but requiring it would be unduly burdensome
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Old 08-19-2009, 04:37 PM   #14
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Are A & B ever marked


Quote:
and I think the confusion in the thread came from this:
I think the confusion comes from old age
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Old 08-19-2009, 06:31 PM   #15
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Are A & B ever marked


The question was
Quote:
are the utility feed wires ever marked A and B
....and things went from there.... Nothing was asked about color coding by the OP it was suggested in a later post as to how that poster did things personally. Then others responded to that persons post....


As for the utility transformer markings for single family dwellings there are 3 secondary bushings where your service drop or lateral are connected. For single winding center tapped transformers providing 120/240 volt residential power the bushings are X1, X2 and X3 and this is stamped into the outer case next to these bushings. X1 and X3 are your ungrounded connections (hot wires) and are connected to each end of the winding and X2 is your center tap of the winding for the neutral connection which also is earthed (grounded) via a grounding conductor to a ground rod or some kind of applicable. electrode.

As for the marking of the wires themselves unless a lineman marks them ....no... remember though the utility responsibility will end at the meter or
drip loop at the mast head for overhead drops. It is common for the legs to be marked by the electrician and especially the neutral in the meter can (sometimes neutral marking is required) or they may be marked at the terminations at the service equipment panel serving the house.

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