Installation of the transfer switch must be performed by a qualified electrician under the guidance of the installation and operating instructions in compliance with all applicable electrical codes. Only viable with indoor circuit breaker panels. a Plug & play home backup solutiona Clean and silent power alternative a Completely pre-wired for easy installationa Includes wattmetersa Metal cabinet, designed for indoor usea cULus 1008 ListedKeep your critical home circuits running when blackout hits. Forget expensive and complicated system with this kit and your DELTA Pro. NOTE: Please consult a qualified electrician for installation. Only viable with indoor circuit breaker panels.