120/208 volt receptacle

[kimrichi]

is 120/208 volt receptacle connected to a copier in an office with480/277 volt system can serve one or three phase
how we calcualate receptacle load for that office (60 000sq ft)and has 200 receptacle 120 volt
thanks

 

[Smart $]

is 120/208 volt receptacle connected to a copier in an office with480/277 volt system can serve one or three phase
how we calcualate receptacle load for that office (60 000sq ft)and has 200 receptacle 120 volt
thanks

Such a receptacle is typically an individual branch circuit (generally called a dedicated circuit), because it will serve only that one load. The number and type of other receptacles do not matter regarding the calculation of this one. The calculation for this receptacle is based on the load it serves.

The question here is: do you know the make and model copier? If yes, get the "cut sheet" to determine the max current draw, convert to VA and simply proceed with a standard calculation. If it is a one phase but the owner wants it sized for upgrading to three phase, you will somehow have to determine the maximum current draw. For three phase, the VA is volts ? amperes ? square root of three, where volts is the utilization line-to-line voltage. The VA at service voltage will be the same.