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    LLOYD FUDGE's Avatar
    LLOYD FUDGE Posts: 1, Reputation: 1
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    #1

    May 22, 2008, 06:51 AM
    208V VS. 240V power
    Hello,

    Just want a clarification: 208v power comes from a wye connection(ie two line wires) does 240 come from a delta connection? Please explain

    Regards,

    l. fudge
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    May 22, 2008, 07:19 AM
    208/277 is typical 3 phase Y connected loads. 277 is used for lighting.

    Note that 208 is sqrt(3) *120.

    240 is typically a delta connection, but it's also residential "single phase"

    Remember that Y-Delta and Dela-Y transformations may be done using just a transformer.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    May 22, 2008, 01:41 PM
    Actually 277/480v is a typical Y 3-phase system. There is NO such thing as 208/277v 3-phase. Not in the US that I know of at least.
    120/208v is also a Y 3-phase system.

    120/240v 3-phase is Delta, with Line to neutral voltages of; 120, 208, 120. All line to line is 240v.
    pelle's Avatar
    pelle Posts: 96, Reputation: 0
    Junior Member
    		  
    #4

    May 22, 2008, 02:02 PM
    Stan you are correct, In my area voltages are 120/240, 120/208, 240delta, 480 delta, and 277/480.. Some of these voltages will come in 3 or 4 wire entrances.. 120/208 is made off 3 pots (transformers) using 2 legs. This is common in large apt bldgs and in commercial areas.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    May 22, 2008, 02:13 PM
    We had 120 sf, 277 sf (I think), 208 3 ph, 480 3 ph as built.

    But there were transformers put in place to yield some odd voltages like 380/3 phase and even some 240 V single phase. And there was one odd japanease piece of equipment that needed 100 V single phase.

    In that building all sorts of power was available.
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