Here is the problem.... at least it's my problem:
4 single phase heater loads are connected line to line on a 3 Phase 240VAC feed. They are arranged as follows:
4 amp load connected across phase A and B
5 amp load connected across phase B and C
11 amp load connected across phase C and A
13 amp load connected across phase B and A
What is maximum current in any leg so I can size the required 3 phase circuit breaker to protect the wiring for the entire group of loads?
I've searched the forums all over the web and cann't get a clear explanation. I get the 3 phase motor load calcs and the 1 phase calcs, but this line to line single phase current on a 3 phase system is still a head scratcher.
To get the currents in each leg, I originally thought I needed to add all the load currents for each phase (4+11+13 for phase A), then I got word to divide this by 1.73 to get the actual current in each leg. The more I think about this, it is not making sense to me, ergo the call for help. I'm not just looking for the "right answer" but the reason why?
4 single phase heater loads are connected line to line on a 3 Phase 240VAC feed. They are arranged as follows:
4 amp load connected across phase A and B
5 amp load connected across phase B and C
11 amp load connected across phase C and A
13 amp load connected across phase B and A
What is maximum current in any leg so I can size the required 3 phase circuit breaker to protect the wiring for the entire group of loads?
I've searched the forums all over the web and cann't get a clear explanation. I get the 3 phase motor load calcs and the 1 phase calcs, but this line to line single phase current on a 3 phase system is still a head scratcher.
To get the currents in each leg, I originally thought I needed to add all the load currents for each phase (4+11+13 for phase A), then I got word to divide this by 1.73 to get the actual current in each leg. The more I think about this, it is not making sense to me, ergo the call for help. I'm not just looking for the "right answer" but the reason why?