These requirements cover suspended ceiling grid@ low voltage lighting systems and components intended for permanent installation and for use in a suspended ceiling grid in accordance with Article 411 of the National Electrical Code@ ANSI/NFPA 70. The suspended ceiling grid@ low voltage lighting systems covered by this outline are intended to be installed in a suspended ceiling grid that provides mechanical support for the ceiling tiles and provides electrical connections between the low voltage power supply and the low voltage luminaires. The low voltage lighting system consists of the following components: a) An isolating type low voltage power supply operating at 30 V (42.4 V peak) or less and not exceeding Class 2 power limits@ b) A grid rail power distribution system to provide power from the Class 2 power supply to one or more Class 2 powered luminaires@ and c) Class 2 powered luminaires that may be recessed into the suspended ceiling@ surface mounted on the room side of the ceiling@ or located below the suspended ceiling. The suspended ceiling grid@ low voltage lighting system is intended to be permanently connected@ for indoor dry locations@ commercial use only@ and installed in accordance with the National Electrical Code@ ANSI/NFPA 70@ the International Building Code@ and the International Mechanical Code requirements. This outline also covers suspended ceiling grid@ low voltage lighting systems intended use in for use air-handling spaces. This outline does not cover suspended ceiling grid@ low voltage lighting systems intended for use in: a) Hazardous locations as specified in the National Electrical Code@ ANSI/NFPA 70@ b) General patient care areas or critical patient care areas as defined by Article 517 of the National Electrical Code@ ANSI/NFPA 70@ c) Emergency systems as defined by Article 700 of the National Electrical Code@ ANSI/NFPA 70. This outline does not evaluate the suspended ceiling grid@ low voltage lighting system for seismic requirements in accordance with the International Building Code. This outline does not evaluate the suspended ceiling grid@ low voltage lighting systems for fire resistance.