FOR PORTABLE GENERATOR: This transfer switch is designed for use with emergency generators that have up to a 30-amp, NEMA L14-30 output. With easy-to-follow instructions, this unit is incredibly easy to install and is a cost-saving alternative to running your portable generator without it. INDOOR OR OUTDOOR: The designed enclosures of the power inlet and transfer switches can be used either indoors or outdoors and have a NEMA 3R rainproof rating allowing the kit to be installed wherever is convenient for you and you home. VOLTAGE: This transfer switch kit is designed with the capability of 2 pole circuits and allows 240-volt circuits, making it perfect for well or water sump pump applications. If one of the installed 2-pole circuits is not needed, the tie bar can be removed to allow for 2 single pole circuits. POWER SURGE PROTECTION: The double throw rocker switches absolutely eliminate the possibility of power back feeding to the utility line or to your generator when power is restored. All Connecticut Electric products are ETL listed, ensuring their compliance to UL Standards. The Connecticut Electric "G2" series generator transfer switch features a 30A,10-circuit manual transfer switch that eliminates the possibility of power back feeding into the utility line or generator when power is restored. This transfer switch comes with detailed instructions to help with the installation process and is an economical solution to get your home's power back on quickly and safely in the event of an outage. It is less expensive than running a natural gas unit and can be used indoors or outdoors. Get this emergency preparedness unit today, and you’ll be ready for anything. When you purchase a Connecticut Electric product, you know you’re getting quality.