PHASE ROTATION

[smb1]

208VAC ATS, N1 is black, N2 is blue, N3 is red. E1 is black, E2 is blue, E3 is read.
Using a Greenlee 5712R Phase Finder I identify N1 as "A" phase. The device then identifies N2 as "C" phase and N3 as "B" phase.
A couple of questions:
1. This device requires me to "set" a phase as "A" it then identifies the remaining two, in the above situation would you consider this ATS to be wired clockwise or counter clockwise with regard to phase rotation? I'm referencing N1 as phase "A".
2. Is my logic in using this tool valid or flawed?
3. I've read a few articles that identify A,C,B as clockwise and A,B,C as counterclockwise. Dor you concur?

 

[Smart $]

208VAC ATS, N1 is black, N2 is blue, N3 is red. E1 is black, E2 is blue, E3 is read.
Using a Greenlee 5712R Phase Finder I identify N1 as "A" phase. The device then identifies N2 as "C" phase and N3 as "B" phase.
A couple of questions:
1. This device requires me to "set" a phase as "A" it then identifies the remaining two, in the above situation would you consider this ATS to be wired clockwise or counter clockwise with regard to phase rotation? I'm referencing N1 as phase "A".
2. Is my logic in using this tool valid or flawed?
3. I've read a few articles that identify A,C,B as clockwise and A,B,C as counterclockwise. Dor you concur?

Rotation isn't dependent on any one line conductor being A phase. Your paradigm is mostly so you have a reference for CW or CCW.

ABC is counterclockwise.

 

[kingpb]

What you are technically referring to is the order in which the phases reach their positive maximum.

The order in which the phases follow each other as it is rotated counterclockwise indicates the phase sequence, this is the standard mathematical model used today. The clockwise would refer more to a magnetic compass where

Phase sequence is important when discussing symmetrical components for analyzing unbalanced faults.

But the CW or CCW is arbitrary really and is more for mathematical vector analysis. Either the phases follow in an ABC or ACB rotation. Instead of ABC, you could have say BCA, or CBA because the sine waves are periodic and the selection of time =0 is arbitrary.

The "rotation" is related more to a physical rotation of a piece of equipment.

Looks like you may have an ACB phase sequence.