i just purchased a 5500 gen.. shop told me to use 20 amp outdoor box with 20 amp twist. they were out of 30 amp boxes. they told me that it can handle the 30 amp... i am using 10/4 wire with a double breaker rated for 30. my concern is will the 30 amp melt the 20 amp outdoor box. they told me the wiring and size of prongs are the same, the layout is different to distinguish amps. Is this safe and true.
thanks for any help.