Southwire Company Thermostat Cable, Number of Conductors 4, 20 AWG, Commercial, 250 ft., Brown

Nonplenum-rated thermostat wire is electrical cable that has been rated for installation in non-air-circulating spaces in buildings, such as closed walls. It is often used to connect thermostat controls to a main power circuit via the ceiling. It is less expensive than plenum thermostat wire, but is more toxic if it burns. It is commonly used in commercial buildings with fewer people present, such as warehouses and distribution centers.

Thermostat wire is electrical cable that connects thermostat controls to a main power circuit. It is typically used in commercial buildings to wire heating and air conditioning controls, as well as bell and fire alarm systems. It consists of multiple insulated conductors encased inside a protective jacket. Each conductor is color coded to help ensure the correct connection to the control board.