I was just looking up some oddball outlet I got in a pail of
electrical stuff at an auction. I went to this website.
What I have is the # 24-15R
Listed for 347V AC.
Now I know what it is, but where do they use 347V AC ?
Or, for that matter, where do they use 277V AC which is also listed?
120 240 208 480 are all common, but these 277 and 347 I never heard
By the way, this is a very handy website. Bookmark it !!!!
If you have a 480 volt 3 phase circuit connected in the Y configuration, the
center of the Y (which is often grounded and also the neutral) to one of the
ends will be 277 volts. This is often used for lighting in buildings that
have 480 volt 3 phase power.
The 347 volts is the same way for a 600 volt Y connected circuit.
277 is the phase to neutral voltage of a 3 phase 480 volt system. Very
commonly used for the lighting in commercial buildings.
347 is the phase to neutral voltage of a 3 phase 600 volt system.
Phase to neutral voltages can be calculated by dividing the phase to phase
voltage by the square root of 3.
The square root of 3 is about 1.73. To get the voltage of a 3 phase system
in the Y connection you devide 480 by 1.73 and get about 277. The same with
the 600 volt circuit to get 347. The numbers are not exect, but just the
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