ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Kaz Recalls Stinger Insect Zappers
by Admin. 10/22/18 11:03 PM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/18/18 08:47 PM
220/230/240V 60Hz Systems
by dsk. 10/17/18 01:25 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
2 registered members (JoeTestingEngr, Admin), 5 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
3 phase numbering #181726
10/26/08 05:07 PM
10/26/08 05:07 PM
Niko  Offline OP
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

Work Gear for Electricians and the Trades
Re: 3 phase numbering [Re: Niko] #181729
10/26/08 08:15 PM
10/26/08 08:15 PM
F
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?)

Re: 3 phase numbering [Re: frenchelectrican] #181730
10/26/08 08:59 PM
10/26/08 08:59 PM
Niko  Offline OP
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

Re: 3 phase numbering [Re: Niko] #181733
10/26/08 11:25 PM
10/26/08 11:25 PM
F
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?)

Re: 3 phase numbering [Re: frenchelectrican] #181735
10/27/08 01:13 AM
10/27/08 01:13 AM
T
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
Re: 3 phase numbering [Re: frenchelectrican] #181737
10/27/08 06:58 AM
10/27/08 06:58 AM
J
jkraft  Offline
Member
Joined: May 2003
Posts: 74
[quote=frenchelectrican] 24/3 = 6

Is that french math?

What are you guys talking about anyway?

Re: 3 phase numbering [Re: Tesla] #181740
10/27/08 09:20 PM
10/27/08 09:20 PM
G
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

Re: 3 phase numbering [Re: GA76JW] #181778
10/30/08 12:23 AM
10/30/08 12:23 AM
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.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Tom
Tom
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,641 Are you busy
188,134 Re: Forum
177,810 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.040s Queries: 15 (0.008s) Memory: 0.9960 MB (Peak: 1.1570 MB) Zlib enabled. Server Time: 2018-10-23 03:12:11 UTC