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    younisseven's Avatar
    younisseven Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 15, 2010, 10:29 AM
    What is 277volt single phase connection and how to connect control switch
    I have to install a hepa filter which is 277 volts I need to istall a receptacle and control switch how can I do it while 1 have 3 phase 110/208v supply also I have 3 phase 480volts. How I will have 277 volts single phase line?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #2

    Jan 15, 2010, 12:46 PM
    You need to check the 480 Volt 3 phase system to see if it is a 4 wire system, which most likely it is. A 4 wire 480 Volt system will have a neutral, and any one phase to neutral will provide the 277 volts your looking for.

    If the neutral does not exist, a transformer will be needed

    I do need to caution you, that if you have to ask a question like this, your clearly not experienced or knowledgeable about electrical systems, or the trade, and should hire a qualified electrician to install this circuit.

    DO NOT, under any circumstances, open the 480 Volt panel while it is energized.

    480 Volts takes no prisoners.
    14u2c's Avatar
    14u2c Posts: 34, Reputation: 1
    Junior Member
    		  
    #3

    Jan 19, 2010, 04:43 PM

    Yes sir like the pro said 480 v don't play!! You get shocked by it you will be lucky to survive.. but read the label on the device real carefully does it say 277 v max or just 277v only?
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