I'm wiring up a subpanel in my garage and have a question...
The subpanel is being fed through a 60A breaker at the main. The main is grounded, and I've got about 50' of 4-3 +gnd Romex coming into the sub (rated for 65A according to the home store). Now in the subpanel, there will be a 30A, 2x20A, and 15A breakers (85A total). These appliances should never be on simultaneously, though. The question I have, however, is this: Is it safe to only have the 60A breaker back at the main (in the case where 85A was accidentally demanded at the sub), or does the subpanel need to have its own 60A main breaker, or does it not matter?
Thanks.