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 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 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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