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Electricians and Electrical Construction

EZ Motor Connections

By Glenn R. Grundberg

I have learned that when making Three-Phase Motor Connections, The easiest way to remember the various configurations is by using the very simple "Rule Of Eleven". It goes without saying that you should ensure that ALL power sources are off and Locked-Out...

A typical three phase motor has 9 wires to be connected, typically numbered T1 - T9.

To Make Low-Voltage Connections, proceed as follows:

*All Connections have THREE wires connected together.

1. Connect 4, 5 and 6 together. ( three wires )
2. Connect 7 and 1 together. THINK OF THIS AS 71. Connect one phase here ( three wires )
3. Add 11 to 71 ( 71 + 11 = 82 )
4. Therefore 8 and 2 are connected together. THINK OF THIS AS 82. Connect one phase here. ( three wires )
5. Add 11 to 82 ( 82 + 11 = 93 )
6. Therefore 9 and 3 are connected together. THINK OF THIS AS 93. ( three wires )

To Make High Voltage Connections, proceed as follows:

*All Connections have TWO wires connected together.

1. Connect one phase to 1. ( two wires )

2. Connect one phase to 2. ( two wires )

3. Connect one phase to 3. ( two wires )

4. Connect 4 and 7 together. THINK OF THIS AS 47. ( two wires )

5. Add 11 to 47 ( 47 + 11 = 58 ).

6. Therefore 5 and 8 are connected together. THINK OF THIS AS 58. ( two wires )

7. Add 11 to 58 ( 58 + 11 = 69 )

Therefore 6 and 9 are connected together. THINK OF THIS AS 69. ( two wires )

It's as simple as that! Of course, don't forget to bump the motor, check the rotation, and switch phases if needed to get the proper phasing before starting up!

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