Scope 1.1 This Standard specifies the requirements for trace heaters, surface heaters, and heating device sets for use on system voltages not exceeding 750 V that are intended to be installed in accordance with the Canadian Electrical Code, Part I. It applies to heating devices installed on or in metal and non-metallic pipes, tanks, vessels, and related equipment and to various surface heating applications. It also specifies the requirements for heating devices that are for use in hazardous locations. Typical applications include a) the protection of pipes, tanks, and vessels, including fire protection systems, from freezing; b) maintaining required temperatures on process equipment, including pipes, tanks, and vessels; c) earth thermal storage; d) hot water temperature maintenance; e) surface heating, including floor, ceiling, and wall-heating; f) snow melting; and g) de-icing of roofs and gutters. 1.2 This Standard does not cover devices intended to heat or to stress relieve pipes or vessels using eddy current, induction, skin effect, or electric current passed directly through the pipe or vessel wall (impedance). 1.3 This Standard does not cover heating elements using carbon ink dispersion. Note: Carbon ink dispersion does not include an extruded polymer material.