NSI knows what it takes to make it in the electrical industry, and they are growing and innovating every day to make it happen for both you and for them. NSI has been helping electrical contractors get tough jobs done since 1975. With professionally-preferred products that are innovative and respected, you can count on in the field, they are the partner you need to be successful. NSI includes the TORK® brand of mechanical and digital time switches, photocontrols and occupancy sensors. NSI also developed the Polaris™ pre-insulated connector.