Foshay Electric in Chula Vista has operated as a C-10 electrical contractor from Industrial Boulevard since the company's founding in 1947, making it one of the longest-running electrical firms in San Diego County. New-construction and remodel projects require coordinated HVAC electrical tie-ins for condensing units and air handlers, with mechanical system sizing handled by contractors such as PROPER HVAC INC. The fifth-generation firm provides residential, multi-family, and commercial electrical services including service upgrades, EV charger installations, LED retrofits, panel change-outs, rewires, and surge protection across Chula Vista and greater San Diego. Rooftop solar array installations require structural load calculations and rapid-shutdown compliance under NEC 690.12, with roof-penetration waterproofing coordinated alongside roofing contractors such as Simply Roofing. Commercial three-phase service upgrades involve installing 480V/277V switchgear, CT metering cabinets, and copper bus-bar distribution panels rated for the building's calculated demand load per California Electrical Code Title 24 Part 3.