dc amps vs ac amps

[Lee Roberts]

ok thanks guys, so Irving where i have used 15a wire here for all my supply wires for my fuse's, i need to upgrade the 1 main wire feeding each fuse to 50% of what my expected maximum could be.

So in that case x3 4.2a drivers could ask for 12.6a down that one "supply" line, so adding 50% i need to upgrade that supply line to a 18.9a wire?

Am i right on this? or do i need to expect my maximum to be what the PSU is giving out, so 14a i would need to use 21a wire, please see the pic to understand more what i mean.

Thanks,
CM