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Old 04-29-2010, 08:33 PM   #1
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Default 3 phase circuit numbering

I would welcome any reference to where online I may find the 'forumula'/shortcut for determing the phase color of a given circuit number in a 3 phase panel (without having to count through the colors on my fingers starting from breaker 1 or 2). For example, what would the phase color be of circuit #37. Thanks.

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Old 04-29-2010, 08:37 PM   #2
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All multiples of 6 are C phase.

Those multiples -1 are also C phase.

Those multiples -2 and -3 are B phase.

Those multiples +1 and +2 are A phase.

36 is C phase, 36+1 (37) would be A.

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Old 04-29-2010, 08:48 PM   #3
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when I put my breakers in, i put a piece of white tape down one side and write the number on it. I also keep a chart on the wire cart and at the panel... Like this

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Old 04-29-2010, 08:54 PM   #4
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Originally Posted by 480sparky View Post
All multiples of 6 are C phase.

Those multiples -1 are also C phase.

Those multiples -2 and -3 are B phase.

Those multiples +1 and +2 are A phase.

36 is C phase, 36+1 (37) would be A.
x2
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Old 04-29-2010, 09:13 PM   #5
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when I put my breakers in, i put a piece of white tape down one side and write the number on it. I also keep a chart on the wire cart and at the panel... Like this

Rats. I'm doing 277...........
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Old 04-30-2010, 12:31 AM   #6
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Easier to just grow 42 fingers and just paint them.
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Old 04-30-2010, 08:30 AM   #7
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Easier to just grow 42 fingers and just paint them.
Yeah but then you have the new 60 circuit panels coming out.
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Old 04-30-2010, 08:37 AM   #8
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I put colors on the text on my ckt #'s on a panel sched I made in excel, so I print one out and stick on panel while roughing in and its brainless.

I was playing with excel last night, here's a formula for if you want to stick a number in a cell and have it tell you what phase (using cell A4)

=LOOKUP(MOD(A4,6),{0,1,2,3,4,5},{"A","A","B","B"," C","C"})

somebody used to make a little card you keep in your pocket for that (like a cheater card for blackjack at the casinos)
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Old 04-30-2010, 08:40 AM   #9
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This guy made a nice little chart... http://www.sparkyuonline.com/Electri...lor-Chart.html
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Old 04-30-2010, 11:26 AM   #10
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This guy made a nice little chart... http://www.sparkyuonline.com/Electri...lor-Chart.html

Black Red Blue?

Always been Red Black Blue here.. I just assumed it was that way almost everywhere... I stand Corrected..

http://en.wikipedia.org/wiki/Three-phase_electric_power
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Old 04-30-2010, 11:29 AM   #11
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All those cheat sheets and cards and whatnot are fine.......... until you lose it or forget it.

Learn to calculate it, and you'll never use these cards & sheets again.
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Old 04-30-2010, 11:39 AM   #12
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Yeah but then you have the new 60 circuit panels coming out.
Guess I'm gonna have to get a job at the reactor..
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Old 04-30-2010, 02:54 PM   #13
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If it's divisible by 6 it's blue, and the one before it too.
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Old 05-05-2010, 08:34 AM   #14
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Default Use your Tape measure

I always just use my tape measure for panels that are series rated, has all the numbers there, and you only have to remember that 1,2 are phase A, 3,4 are phase B - 5,6 are phase C , etc...

Just go to the area you are looking the color for, and start at the 1,2 closest using two fingers along the tape and move your way up/down till you hit the number that you want the color for.

I almost always have a tape with me, but the little cards, might loose them.
I am too dumb to remember all that MATH involved with the other methods.

Around here, commercial colors are Brown Orange Yellow , even though the orange is really for the high-leg technically.
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Old 06-19-2010, 12:53 PM   #15
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Quote:
Originally Posted by 480sparky View Post
All multiples of 6 are C phase.

Those multiples -1 are also C phase.

Those multiples -2 and -3 are B phase.

Those multiples +1 and +2 are A phase.

36 is C phase, 36+1 (37) would be A.



That is the best way right there.....
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Old 06-20-2010, 09:30 AM   #16
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anything divisable by 6 is "C" phase.
Like 480 posted.

Learn it and you will find it is easier and faster then those cheat sheets and what nots. More professional also.

Everyone on the projects I ran could tell you the circuit color without a cheatsheet.
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Old 12-14-2010, 05:12 PM   #17
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Divide circuit number by 6 then use the remainder to identify the phase color.

Remainder 1 or 2 Red
3 or 4 Black
5 or no remainder Blue
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Old 01-07-2011, 10:46 PM   #18
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Thanks for the posts I had the same questions and am glad I found this site!
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Old 01-08-2011, 07:50 PM   #19
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If it's divisible by 6 it's blue, and the one before it too.
That's the method I was taught.
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Old 01-08-2011, 07:53 PM   #20
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Black Red Blue?

Always been Red Black Blue here.. I just assumed it was that way almost everywhere... I stand Corrected..

http://en.wikipedia.org/wiki/Three-phase_electric_power
In Canada, it's Red Black Blue but I've caught electricans doing Brown Orange Yellow for 600v, and I tell them that it's only for "isolated circuits" though I don't know what an isolated circuit really is (for hospital use), unless it's some kind of long leg delta transformer setup where the long leg has to be marked Orange. Never worked with either. But it's in the codebook.

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