jar546
CBO
Here is an example of a load calc for a 120/208Y 3-phase panel. As you can see, the load for this panel with its 3 motors and 1 RTU is 31.81KVA. You divide the voltage into the load so in this case it is 31,810 / 360 to get 88.36A.
Wait! Why divide by 360 you ask when the voltage is 208? Because it is 3 phase and not all 3 phases are producing the same amount of power at the same time. 1.732 is actually the square root of 3. so if you ever forget what the 3 phase multiplier is, remember 3 phase and the square root of 3.
Therefore 208v X 1.1732 = 360. If we were only using single phase such as 208 the amperage would be 153A, almost double the amperage of 3 phase.
The more you know........
Wait! Why divide by 360 you ask when the voltage is 208? Because it is 3 phase and not all 3 phases are producing the same amount of power at the same time. 1.732 is actually the square root of 3. so if you ever forget what the 3 phase multiplier is, remember 3 phase and the square root of 3.
Therefore 208v X 1.1732 = 360. If we were only using single phase such as 208 the amperage would be 153A, almost double the amperage of 3 phase.
The more you know........