An interlock kit is a device that allows a portable generator to be safely connected to a home's electrical panel. It prevents backfeeding of electricity into the grid, protecting utility workers and preventing damage to appliances. The kit includes a mechanical interlock that ensures only one power source can be used at a time, either the utility power or the generator. This provides a simple and effective way to switch between power sources during an outage, ensuring a seamless transition to backup power. Interlock kits are essential for safely and efficiently using a generator as a backup power source for a home.