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Thread: Three phase 208Y with 120V

  1. #1
    DIYer, not in the trades LLigetfa's Avatar
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    Default Three phase 208Y with 120V

    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. #2
    Moderator & Master Plumber hj's Avatar
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    Default

    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.
    Licensed residential and commercial plumber

  3. #3
    Electrician ActionDave's Avatar
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    Quote Originally Posted by LLigetfa View Post
    He said he didn't realize that a three phase 208Y would put out just 104V when split......
    That's just not true.

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