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    jagadeesh60's Avatar
    jagadeesh60 Posts: 1, Reputation: 1
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    #1

    Jun 25, 2012, 10:29 PM
    Home power supply
    At some places we generally see 3 lines in power supply where as in some other we see 5 lines. Can anybody please explain the difference?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jun 26, 2012, 02:40 AM
    3 usually means two circuit conductors plus a ground (earth).

    5 can mean 4 are two circuits, plus one ground.

    There may be other combinations, one is usually a ground.
    sinnadurai's Avatar
    sinnadurai Posts: 127, Reputation: 2
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    #3

    Jun 26, 2012, 10:41 PM
    You didn't mention in which country you saw this as well as the type & voltage of power system in use. In BS-LT-3phases,1neutral,1return for street light(total 5) or 1phase,1neutral,1 return (total 3). Earth or ground wire depends on type of earthing -IT,TT,TNCS etc. In HV 3phases & 1 earth wire(total4). I belief in USA/Canada-LT-220/110V-2phases,1neutral(total 3) or 3phases 480V,1neutral etc
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