Originally Posted by industrialboy
i have a 600 amp panel with parallel feeds in two different runs of conduit.
one run of conduit has 3 500 kcmil and a 4/0 for ground.
second one has 3 3/0 thhn and a 1 awg for ground.
(IS THIS CODE) can you run different size wire on a parallel feed.
Totally wrong. The panel may work fine without much load but as others have said if the load gets up there you will have issues.
You need to have parallel 300kcm copper conductors if the calculated load on the panel is 570 amps or less. Art. 240.4(B) allows us to use the next size breaker -- 600 amps.
Your egc needs to be based on the 600 amp breaker from T. 250.122. This means you need a #1 copper conductor in both raceways.
When you say 4/0 for ground and #1 for ground are you meaning neutral or the EGC (equipment grounding conductor)?