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circuit phase Identification method #167656 08/17/07 05:52 AM
Joined: Jun 2007
Posts: 20
A
Angel_Electric Offline OP
Member
I'm working more and more on three phase 120v 208v; 277v 480v applications I need a method of computing the circuit numbers into the phase of the circuit. Accuracy and efficiency is key.
I've been told there is a way to correlate the number with a multiplier and Identify the circuit phase. Any body ever heard of such methods or other applicable means would be greatly appreciated.

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Re: circuit phase Identification method [Re: Angel_Electric] #167657 08/17/07 06:11 AM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
A company I worked for gave us all stickers the size of a business card with a chart of circuits 1 to 84 identified by phase and the colors we use.

We stuck them inside our hard hats, they also gave us laminated versions for our wallets.

In my opinion it was worth it, you can make them yourself on a PC.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: circuit phase Identification method [Re: iwire] #167684 08/17/07 06:54 PM
Joined: Jul 2006
Posts: 1
O
OUSoonerFan3 Offline
Junior Member
Divide circuit number by 6. Remainder will tell you what phase. 1 or 2 A phase, 3 or 4 B phase, 5 or no remainder C phase.


Sean
Re: circuit phase Identification method [Re: OUSoonerFan3] #167703 08/18/07 04:51 AM
Joined: Jun 2007
Posts: 20
A
Angel_Electric Offline OP
Member
I appreciate the tips greatly.!!!

Re: circuit phase Identification method [Re: Angel_Electric] #167773 08/19/07 10:24 PM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline
Broom Pusher and
Member
The method posted by OUSoonerFan3 is what you were looking for - regarding the "Mathematical Way".
If you are good with Math, this will work great for 3 Phase "L-R" Circuitry (Circuitry in Panelboards, with Circuits on the "Left" and the "Right" sides).

It doesn't work with the following configurations:
  • Single Phase "L-R" Panels,
  • Panels / Gear with only a "Single Row" of Circuitry,
  • Power Panelboards with multipole Circuitry under the same "Number" - such as a 3 pole OCPD at the upper left of a Panelboard identifies A, B and C as "Circuit 1",
  • Panelboards with "Stack Breakers" or "Piggyback Breakers" - such as a "QO-20/20",
  • Old "Bulldog" / "Pushmatic" Panels


Iwire's response brings up a very good point - create color charts for various scenarios.

I have created a set of these in Excel, which you may use if needed.
Just E-amil me, and I will bounce it your way.

Scott


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: circuit phase Identification method [Re: Scott35] #168412 09/03/07 08:08 PM
Joined: Sep 2007
Posts: 1
D
dadgene Offline
New Member
Hello Scott i am new here and read your post on phase and circut identifiers color and # charts I would greatly like to get them charts!!! the cubs are drivin me!!! so would you please bounce em my way thank you EUGENE

Re: circuit phase Identification method [Re: dadgene] #168448 09/05/07 02:41 AM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline
Broom Pusher and
Member
dadgene

Send me an E-mail (so I can get your address), and I will pass on the spreadsheet to you.

Scott

BTW, my E-mail address may be found by either:
  1. Clicking on my user name in this reply (underlined link in the left pane),

    or
  2. Clicking on my username in the Moderator list at the bottom of this thread.


Me...


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: circuit phase Identification method [Re: Scott35] #168505 09/06/07 06:39 PM
Joined: May 2004
Posts: 73
R
Ralpha494 Offline
Member
My method works whether the breakers are numbered the normal way (of odds on the left and evens on the right)or 1 to 21 on the left and 22 to 42 on the right. It just identifies C phase though. I just see if the number is a factor of six. Even numbers who's sum is divisible by 3 is how I've been doing it if I didn't have a chart. Examples: 30 even number 3+0=3; 54 even 5+4=9; 84 even 8+4=12; 102 even 1+0+2=3. So the normal numbering system identifies C phase on the right side only you have adjust accordingly. The other numbering system (1-21 on the left) just identifies every other one. So there.


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