Verifying Phases in Electrical Panel

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Smart $

Esteemed Member
Location
Ohio
The rule changes a bit...

Division by 3:
Remainder of 1 -> ØA
Remainder of 2 -> ØB
Remainder of 0 -> ØC

:thumbsup::thumbsup:
Actually, I take that back. The error is plainly obvious if one labels left odds and right evens. Space #2 would be ØA, not ØB.

Now if you numbered consecutively left first, top to bottom, then right, it would work.
 

jumper

Senior Member
If a panel is numbered with all the odd numbers on the left and all the even numbers on the right, then you have to divide by six since both breakers in the same horizontal row are on the same stab.

Yep.

It is even more complicated if the panel is also numbered on the basis of half width breakers so that, for example, 1 and 3 as well as 2 and 4 are all on the same stab. For that you would divide by 12.

General convention IME is still use the stab/slot position as the number since that is what corresponds to which line/phase the half or tandems will be installed one.

IE, a tandem breaker in breaker slot #7 will protect two circuits both on A phase and commonly a black wire for 208Y/120V.

The upper or forward position could be 7A and the bottom or back one could be 7B. The bus stab/hole/slot position remains 7; A phase, Black conductor(s).
 
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