Lively fire suppression systems are connected to the electrical infrastructure of the constructing, and that is furnished by electrical service providers. Condensed Aerosol Fire-Extinguishing Systems, NFPA 2010; these https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence