We had the incoming line to the complex blow a fuse yesterday. Single phased the place for over an hour until the power company got there.
My question is how are those things sized?
why do I ask? Because they are 125 amp fuses on a 7200 volt line. After changing them out the lineman measured the load it was 92 , 106 and 110. That 110 sure sounds a bit to close to me but I know next to nothing about HV stuff.
Now 125 amps at 7200 volts would be 1875 amps at 480 volts correct?
There is going to be a meeting with the power company and my engineer boss to try and solve this problem.
