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Wye and Delta Electrical Configuration

The Definition of Wye and Delta Electrical Configurations as taught in Electrical Trade Schools



The Definition of  Wye and Delta Electrical Configurations

Electrical Training Question: I am a graduate of an electrical trade school and have 2 yrs experience.

Background: Eddie, a Electrician from La Puente CA
Dave’s Reply:
Thanks for your electrical question Eddie.

Wye and Delta Electrical Configurations

The Wye and Delta, also described as Y-delta, Wye-delta,  is a mathematical technique to simplify the analysis of an electrical network. The name is given due to the shapes of the circuit diagrams, which look respectively like the letter Y and the Greek capital letter which resembles a Triangle. In the UK  the Wye diagram is also known as a star.
Because the Y and Delta is directly related to the transformation of electricity,  it will also be helpful to see how this is applied at the transformer:

Using Three-Phase Transformer Connections as a Practical Example

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Questions about Wye and Delta Electrical Configuration


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  1. Gerardo Lorenzo says:

    I have an MR11 lamp running on 12 volts and pulling 35 watts. I want to use a transformer with a 120 primary and secondary 12 volts and 75 watts max. Will the transformer heat up?

    • Dave Rongey says:

      Hi Gerardo,
      As long as the transformer is rated for the MR11 lamps that you have, there is actually 40 watts to spare so this is within the watt capacity. Keep in mind that transformers do warm up while in operation so they must be installed properly. Always use a transformer or power supply that is recommended by the manufacturer of the light fixture.
      Dave

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