What color is circuit number 23 in a 120 volt three phase panel?

Answer 1

Your service entrance cable could be Black, Red, White and bare cable. In a 240 V panel there would be 240V between Black and Red and 120 V between Black and White and Red and White. In the branch circuits the colors are Black, White and Bare wire. Black is Hot, White is Neutral and bare wire is earth ground and should be terminated on the ground bus in the main panel.

Answer 2

blue

Blue

Yea blue is correct.

I think what you have here is a 120/208 three phase panel

The colors used in 120/208 volt 3 phase system would be Black, Red and Blue

Black = phase A

Red = phase B

Blue = phase C

The voltage between any of these phases' conductors and ground or the neutral, which is also a grounded conductor will be 120 volts read in RMS. Most voltmeters read the RMS voltage.

The voltage between any two of these phase conductors will be 208 volts, be careful.

When you view the front of the panel the breakers on the left will all be odd numbers, and the breakers on the right will all be even numbers.

All of the circuits combined; one black, one red, and one blue are sometimes referred to as a network. All three phases are there.

Looking at the panel from the front...left side

1,3 and 5 are a network because there is an A, B, and C phase together

Looking at the panel from the front...right side

2, 4, and 6 are a network because there is an A, B, and C phase together

This pattern just keeps repeating and if you look in the panel you will find black, red, and then blue down both sides of the panel.

A quick way to determine the phase color is to divide the circuit number by either 6 or 3 and then find the remainder. Use the remainder as if it were the circuit number to determine the phase. This makes the number smaller. In the circuit 23 case here 23/6 = 18 remainder 5; 5 is the C phase and should be blue.

If the number is smaller use 3 to find the remainder.

Also if the remainder is either 5 or zero the phase is C

Hope this helps

1 Blk 2 Blk

3 Red 4 Red

5 Blue 6 Blue