Maximum amps in circuit box
How do I tell if I am at the maximum amps that my circuit box can handle? Do I count up the individual switches? Or can I assume that if there are slots left in the box that I can add something? I don't want it overloaded, for obvious reasons, but I need two more 20 amps circuits added, and if I count all the amps of the circuits in there now, we are already over the limit!
It is a 220 amp Cutler-Hammer box if that helps.