I'm building out a van for myself and came to AC panel/box. I'm going with MCB. I'll have a 3000w inverter, 30 amp shore power. My plan is to use 10/3 awg wire from inverter/shore power to breaker box. First, wire in 30a single pole type C then run jumper wires (10 awg) to each additional single pole breaker. My thoughts are that type C for first breaker that jumping to all other breakers type C and type B breakers. These will be type B except air conditioner which will be a type C. Please note that I am not an expert on these things so don't take this as the correct way of doing this.
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