Even paralleling has options
Even paralleling has options
I do a lot of gensets, quite a few with 800A output CBs. A lot of engineers draw the SLD with (2) 600MCMs paralleled, which ensures 100% capacity for the 800A output (vs. 2 500 mcms which is only 760A, still code legal). However, I would bet $100.00 that none of the EE's that select that parallel size have ever, ever, ever field bent 600MCMs in the small alternator control box (and pulled em in, etc.). Also, std. lugs on CB's are 3 barrel on 800A CB's. So the best answer is (3) parallel 300MCMs per phase. And when you look at the conduit, you'll find the materials for the triple set cheaper than the larger double set. But the EE's don't get it (well, those that have no field experience).