Three phase 208Y with 120V

Discussion in 'Electrical Forum discussion & Blog' started by LLigetfa, Nov 7, 2012.

  1. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,977
    Location:
    NW Ontario, Canada
    Now, I'm no EE and not even an electrician but it is my understanding that on a three phase with 208V between phases, one still gets 120V to a fourth neutral. Is there any "normal" system that would give you much less, like 104V?

    My furnace guy was making excuses for being a day late. He said he wasted the day before on a three phase system where the voltage was low. He said he didn't realize that a three phase 208Y would put out just 104V when split. I've never heard of such a thing. I dunno... sounds like something was jury rigged.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,636
    Location:
    Cave Creek, Arizona
    240 single phase will give two 120v lines. 208 three phase is out of synch with the neutral so it gives 208 between aany two "hot" lines but 120 v to neutral. He was misdiagnosing something.
  3. ActionDave

    ActionDave Electrician

    Messages:
    346
    Location:
    Colorado
    That's just not true.
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