The sub panel that is right next to the 200 amp main service panel. The sub is fed from a 100 amp breaker in the main. The main breaker and the 100 amp breaker in the main panel are easily reached without takeing a step away from the sub. Since the panels are right next to each other, does the sub need its own main breaker? Can I use #3 AWG for the 100 Amp supply to the sub?
Previous owner added this sub panel to be used for his generator, inverter set up. The panel was wired only to one side of the line because his 120 V inverter.