37 Comprehensive preventative maintenance service for electrical systems; Electrical contracting; Electrical contractor services; Electrical repairs and installation of generators; Electrical repairs, maintenance, and installation of electrical wiring, outlets, light fixtures, and electrical panels; Installation and maintenance of burglar and/or fire alarms; Installation of electrical wiring; Installation of security systems; Installation, maintenance and repair of electrical lighting apparatus; Installation, maintenance and repair of fire and security alarms; Installation, maintenance and repair of fire, smoke and heat alarms; Installation, maintenance and repair of fire, smoke and heat detectors; Installation, maintenance and repair of electrical systems; Maintenance of fire alarm installations; Technical consultation in the field of installation of lighting apparatus, lighting instruments and lighting systems