load balance and different load sources

[mannyb]

How critical is it to keep load balanced. The loads on a 3 phase panel vary from 10-15 amps. Some loads are 2 pole and some single pole. I can move around the breakers to balance load but is there anythey NEC that says it has to be balanced.

2nd Q. Is there a NEC reference to bring in two different power sources into a piece of equipment? I have two 120/208 power sources into one piece of equipment. The panel is over loaded feeding the original equipment so they brought in another set of circuits from a different panel into equipment. its the same voltage just different sources. anyone see a violation per NEC

 

[kwired]

How critical is it to keep load balanced. The loads on a 3 phase panel vary from 10-15 amps. Some loads are 2 pole and some single pole. I can move around the breakers to balance load but is there anythey NEC that says it has to be balanced.

2nd Q. Is there a NEC reference to bring in two different power sources into a piece of equipment? I have two 120/208 power sources into one piece of equipment. The panel is over loaded feeding the original equipment so they brought in another set of circuits from a different panel into equipment. its the same voltage just different sources. anyone see a violation per NEC

A variance of only 5 amps is considered pretty well balanced most of the time, unless you have a very limited source.

If equipment was designed for two circuits to supply it then I don't see that it matters if they come from different places.

If local disconnect required at said equipment you have your disconnecting means within sight. If allowed to have remote disconnecting means, you may at very least want some labeling stating where each disconnecting means is located, though not sure if required.