I have a burned out three position switch for the shore power. Already found an new one online. The shore power pedestal seems to be in good condition with a good ground that opened the breaker before any real bad stuff happened. I power off the 50 amp connection with a marinco splitter to two 30 amp cords to the boat. None of the connectors for shore power show any damage or heat with a temp gun while running all AC service. Two 16000 air units, battery charger, water heater and some lights, computer and etc. Everything powered up on #1 shore power leg shows 14.7 amps on one black wire to panel "A" using a blue sea clamp meter.
The other leg runs off the #2 shore power 30 amp connector for the air units and carries 28 amps with both units operating. Everything works normal with no hot breakers or connections checked with temp gun. I removed the switch and determined that the switch had an internal meltdown that allowed current flow to the black and white wires of the genset from the #2 circuit black wire. This can't be good!
I temporary wired the two circuits to bypass the switch so we could still use Air Cond and such . Everything is working but I discovered I could not tie the two 30 amp legs together. Acts like a dead short. My question is why? They both come off the 50 amp splitter? The two black wires are from the two 30 amp inputs from the 50 amp service. All grounds are good and tied together as per Calder's book.
According to the way the switch was wired the Gen set is a 50 amp service and was tied into the two 30amp services as was the shore power, only from a different direction but the same wiring setup. I am not understanding the difference? The switch that went bad Kraus & Naimer Bypass Selector Rotary Switch C42 65A. Any qualified help in understanding would be appreciated.