This part of IEC 60519 deals with safety requirements for electrical resistance trace heating systems in industrial and commercial applications. This standard pertains to trace heating systems that may comprise either factory fabricated or field (work-site) assembled units, and which may be series heater cables, parallel heater cables, heater pads or heater panels that have been assembled and/or terminated in accordance with manufacturer’s instructions. Typical applications include but are not limited to - the freeze protection of pipes, tanks and vessels, including fire water systems; - maintaining required temperatures of equipment, including pipes, tanks and vessels; - earth thermal storage; - hot water temperature maintenance; - snow melting of surfaces; - de-icing of roofs and gutters. This standard does not include or provide for any requirements in potentially explosive atmospheres. This part of IEC 60519 does not cover induction, impedance or skin effect heating. NOTE Specific requirements and test criteria for electrical resistance trace heating systems and design, installation, and maintenance requirements for these systems are detailed in IEC 62395-1 and IEC 62395-2. This standard provides general safety requirements for the installation, operation, maintenance and repair of systems and individual circuits and for trace heating systems designs. These safety considerations concern the protection of persons and the environment against dangers of electrical origin and also against certain dangers of non-electrical origin, common to all types of equipment and installations.