Branch, feeder and service power distribution in commercial, industrial, institutional, and multi-residential buildings. Power, lighting, control, and signal circuits. Fished or embedded in plaster. Concealed or exposed installations. Environmental air-handling spaces per NEC 300.22(C). Places of Assembly per NEC 518.4 and theaters per NEC 520.5. As aerial cable on a messenger. Installation in cable tray and approved raceways.