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    weshleman's Avatar
    weshleman Posts: 1, Reputation: 1
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    #1

    Mar 19, 2010, 08:22 PM
    How to wire a single phase heater with 3 phase
    I have a single phase 238-240v air handler with 15 kw(3 - 5kw strips) of heat strips. I want to wire this with 3 ph 208 wye. Can I change the wiring to this: L1 ~~~H1~~~L2 / L3 ~~~H2~~~L1 / L2~~~H3~~~L3. Then send L1 & L2 to the 240 system fan for a single phase fan motor. This Should give me a load of approx 50 amps per phase with an additional 4 amp load from the fam motor on L1 and L2. I planned to use a triple pole 60 amp for the service. Is this right? Will this work not having 3 phase heater coils? Please advise.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Mar 20, 2010, 03:40 AM
    There is no such thing as a 3 phase heater, they will always be three single phase heat elements connected in a Delta fashion, see diagram.
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    vinay149's Avatar
    vinay149 Posts: 2, Reputation: 1
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    #3

    May 26, 2012, 06:14 AM
    How to wire the 9 coils of heating furnace carring 65A current . If it connect in delta fasion where to connect neutral wire, Is it necessory to connect neutral wire coming from transformer?
    I have the problem that when one of the phase get dissconnect neutral wire carring current . How I wire these 9 coils using neutral ?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    May 26, 2012, 06:21 AM
    Exactly what type of delta system do you have?
    vinay149's Avatar
    vinay149 Posts: 2, Reputation: 1
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    #5

    May 26, 2012, 10:58 AM
    I connect it in star i.e. end of the cois goes to neutral of transformer
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