The THTS-50 is rated for use on circuits capable of delivering 105-130Vac 60 Hz 50Aac. All field wires used have to be rated to at least 105C. All grounds are connected inside of the THTS-50. THTS-50 is for a 50 Amp AC service. It is installed onto a Power Center. To minimize voltage drop across the wire, install the power center with the PMTS-50 as close to the generator and shore power cord entrance as possible. Do not install close to appliances that are a source of heat or water (such as water heaters, furnaces, and under refrigerators). It is not designed for mounting in wet locations.