I have a generator with a continuous run of 7000 watts and a surge of 8750 watts. I bought a manual transfer switch to install in the house. It has a peak of 12,500 watts. The inlet plug is an Nema L14-50 and is incompatible with my generator as it has a Nema L14-30 plug. My question is, can I buy a Nema L14-30 and install it in the panel or maybe change the end of the extension cord to a Nema L14-50 female plug with a Nema L14-30 male plug in the other end to plug into the generator? :confused:

Couple of Very Good People on Code here. In all cases, The wire must be protected by the breaker.Does the Manual Transfer have several breakers?

Yes, it has 2-30 amp, 2-20 amp and 6-15 amp breakers. However the biggest thing I would hook up is a well pump on the 30amps and MAYBE the refrigerator. Everything else would be minimal lights.