Single phase and three phase transformer L-L full load current calculation shortcuts.

[11bgrunt]

Shortcuts that have always worked for me.
Single phase and three phase transformer L-L full load current calculation shortcuts. Examples of my shortcut and the actual calculation results are below.

1Phase @ 240 L-L Volts = kVA X 4
100kVA X 4= 400 vs 416.7 Amps

3Phase @ 208 L-L Volts = kVA X 2.8
1000kVA X 2.8 = 2,800 vs 2,775.8 Amps

3Phase @ 240 L-L Volts = kVA X 2.4
1000kVA X 2.4 = 2,400 vs 2,405.7 Amps

3Phase @ 480 L-L Volts = kVA X 1.2
1000kVA X 1.2 = 1,200 vs 1,202.8 Amps