I have a 2 pole 60 amp Manuel transfer switch. I am installing a 2 pole 60 amp breaker in my main panel with #6 wire ( 2 hots and a neutral plus ground) to feed the 2 pole 60 amp transfer switch. From the main lugs on the 2 pole 60 amp transfer switch I am feeding a sub panel with #6 wire ( 2 hots and a neutral plus ground) . In the sub panel I will have 8 ckt breakers that will be feeding various appliances (Watts will not exceed 7000). In the garage I will install a 30 Amp 240 volt Generator power cord inlet box that I will plug my portable gas Generator into with a 30 amp 240 volt cord. From the 30 amp inlet box I will be installing #10 wires ( 2 hots and a neutral plus ground) to the 60 amp 2 pole manual transfer switch.
My question is this - The transfer switch consists of two 2 pole 60 amp breakers that can not be in the on position at the same time, one of the 2 pole 60 amp breakers is going to have the # 6 wire from my main panel the other 2 pole 60 amp breaker is going to have the # 10 wire from the generator inlet box, can I have the #10 wire feed to the 60 amp breaker or is it a violation? I can't swap out one of the 2 pole 60 breakers with a 2 pole 30 breaker because that is how the transfer switch is built. The # 10 wire is carrying power that is being made from the generator then going to the 2 pole 60 amp breaker so the 60 amp breaker is not protecting the #10 wire it is protecting the 8 ckt breakers in the sub panel. So will there be any violations with the #10 wire on the 60 amp breaker??

Does your generator have a breaker on it?

Does your generator have a breaker on it?

Not sure yet I will find out and let you know.

Some do. And if your generator has a 30 Amp breaker, you should be OK with the 10 ga. Wire. But no way can you use it with 60 amp circuit protection. It's not safe.

MB is correct, either the genset needs to have a 30 amp breaker to protect that output, or before the input outlet there needs to be a 30 amp breaker to properly protect the #10 wire feeding the 60 amp breaker in your transfer panel.

I am sure the genset will have a breaker.