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    Theresa Bort

    Hi Baylee,

    Do you have the PPI2pass study material for Project, Planning, and Design? If so, it explains this pretty well on page 17-23. The diagrams are a little more simplified. Essentially, the lower number of any of the four service types (120/240, 120/208, 277/480, and 2400/4160) goes between the neutral wire and a hot wire. The higher number goes between two hot wires. It helped me to memorize the four different service types and which phases and number of wires is associated with each. Shouldn't be any calculations necessary--just pure, old-fashioned memorization. =)

    I hope this helps!

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    Osman Bilger

    Great answer above.


    This is a helpful video to understand "phases" . The advantage being higher power without the need for thicker wires, and more smooth delivery of power to machinery

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    Baylee Holder

    thank you so much! this helps a lot. 

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