R
ray1972
I have a question regarding the distribution of single phase 220 VAC branched directly from a 380 VAC 3 phase supply. I have done some research on the web, however have not been able to find a formula that exactly explains my situation, at least not clearly enough to make a solid decision.
I am not experience in the math behind branching 3 phase to single phase, especially when it comes to loads. I asked for 2 separate single phase supplies. One 62 amp and one 32 amp, which will be running 2 separate control systems.
It seems that I have been provided a single 62 amp 3 phase supply, where I have been instructed to tap off the 3 phase to acquire my 2 separate single phase lines. My first concern is that the 3 phase supply will be very unbalanced, pulling 60 amps off one leg and 30 off another.
Just to start, let's say I was balanced across all three branches. Would this be the proper formula to calculate the per line amperage at 220 single phase per leg?
380*1.73*60/3/220
The above formula brings me back to 60 amps per leg, however from what I have seen, adding amps per leg is not typically acceptable.
I am not experience in the math behind branching 3 phase to single phase, especially when it comes to loads. I asked for 2 separate single phase supplies. One 62 amp and one 32 amp, which will be running 2 separate control systems.
It seems that I have been provided a single 62 amp 3 phase supply, where I have been instructed to tap off the 3 phase to acquire my 2 separate single phase lines. My first concern is that the 3 phase supply will be very unbalanced, pulling 60 amps off one leg and 30 off another.
Just to start, let's say I was balanced across all three branches. Would this be the proper formula to calculate the per line amperage at 220 single phase per leg?
380*1.73*60/3/220
The above formula brings me back to 60 amps per leg, however from what I have seen, adding amps per leg is not typically acceptable.
