Interval Space Required:1 3/8 Inch Spacing between main and generator breaker.
Safe use:the manual transfer switch device allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages.
Includes detailed installation instruction manual
Interlock kits for Square D QO and Homeline panels with 150 and 200 amp ratings are readily accessible.