If I use a pigtail to plug my tt into the 50 amp receptacle with a 50 amp breaker, I would have to use 50 amps to trip the breaker on the post. I don't need to use over 30 amps. because the land line to the tt is 10awg rated at 30 amps. I could burn land line or connections before the 50 amp. breaker trips. I usually trip the 15 amp breakers inside the tt when I use too many appliances at the same time, no matter what you have coming from post if you overload the inside breaker it will trip. The reason they have 30 amp breakers for 30 amp systems is for safety, the wiring is thirty amp.,the breaker should match the wiring.
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