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#181726 - 10/26/08 04:07 PM 3 phase numbering  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
can someone refresh my memory on how to figure out what circuit # is on what phase.
I think it was divide the circuit # by 6 then the remainder will determine what phase it is on????

Thanks.



Be kind to your neighbor, he knows where you live


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#181729 - 10/26/08 07:15 PM Re: 3 phase numbering [Re: Niko]  
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
It always be on sum of 3 so like example if I want to know what phase it will be on Ciruit #24 24/3 = 6 so with #6 it will be end up on C phase.

#6 and #3 are on phase C depending on how you read the bussbar arrangement but normally they will be read from top to bottom.

Merci,Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


#181730 - 10/26/08 07:59 PM Re: 3 phase numbering [Re: frenchelectrican]  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
Marc thanks for your reply,

so if you have 36 then it is "B" phase, 42 is on "A" phase and 25 is on "A" phase. Am i correct??

Thanks


Be kind to your neighbor, he knows where you live


#181733 - 10/26/08 10:25 PM Re: 3 phase numbering [Re: Niko]  
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
Niko.,

You are close but let me expain little more clear on this one

majorty of 3Ø breaker box the bussbar arrangement is A-B-C if you look from the front the letter is left to right arrangement expect the I Line and few other the buss read 90° around it will read from front to back and also a warning here some two pole breaker and some single pole breaker may land on diffrent phase squenice espceally with some of the two pole breaker I know I deal with on the I Line series on two pole breaker it will have AB , BC or CA format it may throw you off the track when you do the set up

for the normal numbers I useally sum it by 3 unless you have oddball arrangement then go either 6 or 9 depending on the set up.

Merci,.
Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


#181735 - 10/27/08 12:13 AM Re: 3 phase numbering [Re: frenchelectrican]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
The rythym is Black, Black, Red, Red, Blue, Blue at 208Y120.

This is repeated seven times in the typical three phase panel of 42 circuits.

So...

1,2 Black
3,4 Red
5,6 Blue

The colors shift if we're talking 480Y277
But the rythym stays the same.


Tesla

#181737 - 10/27/08 05:58 AM Re: 3 phase numbering [Re: frenchelectrican]  
jkraft  Offline
Member
Joined: May 2003
Posts: 74
[quote=frenchelectrican] 24/3 = 6

Is that french math?

What are you guys talking about anyway?


#181740 - 10/27/08 08:20 PM Re: 3 phase numbering [Re: Tesla]  
GA76JW  Offline
Member
Joined: Mar 2004
Posts: 193
Suwanee, GA USA
Originally Posted by Tesla
The rythym is Black, Black, Red, Red, Blue, Blue at 208Y120.

This is repeated seven times in the typical three phase panel of 42 circuits.

So...

1,2 Black
3,4 Red
5,6 Blue

The colors shift if we're talking 480Y277
But the rythym stays the same.




IMHO this is the easiest way for you to do it. You are on the right path with the divide by six and then use the above chart with the remainder. I only added one change to it though.


1,2 Black **** Brown
3,4 Red **** Orange
5,0 Blue **** Yellow

You divide the circuit number in question and then use the remainder to find the circuit color.

ex.

Circuit 64

64/6 = 10 full times with a remainder of 4. Check the chart and 4 is red or orange.


Circuit 30

30/6 = 5 full times with no remainder so the 0 is used.
So it is a Blue or Yellow circuit.


Circuit 87

87/6 = 14 full times with a remainder of 3. 3 is also a red or orange circuit.



I hope I explained as close to the way I learned it. Seems easy for me, may not for others. Great part of this trade is we take from others things we can use, and sometimes it works and sometimes it doesn't.

LMK if I can explain it any better.

Philip


"If common sense was common, everyone would have it"-not sure, someone here


#181778 - 10/29/08 11:23 PM Re: 3 phase numbering [Re: GA76JW]  
noderaser  Offline
Member
Joined: Mar 2007
Posts: 404
Portland, Oregon, United State...
On dimmer racks, the busses are separated by phase, so it's easy to tell which dimmer (circuit) is on each phase. It's not as easy to find a dimmer by number, as the numbering from top goes 1, 2, 7, 8, 13, 14, etc.



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