UL 515 BULLETIN

Abstract

These requirements cover electrical resistance heat tracing for commercial and industrial applications as applied to piping, vessels, traced tube bundles, and mechanical equipment. Heat tracing includes heating cables, heating panels, and associated parts. This equipment is intended for installation in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70, Article 427, and one of the following installation guidelines: <br>a) IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Industrial Applications, IEEE 51 5; or <br>b) IEEE Recommended Practice for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Commercial Applications, IEEE 51 5.1.<br>These requirements also cover commercial applications of electrical resistance heat tracing for deicing roofs, gutters, and pavement. This equipment is intended for installation in ordinary locations in accordance with the following installation guidelines: <br>a) National Electrical Code, ANSVNFPA 70, Article 426; and <br>b) IEEE Recommended Practice for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Commercial Applications, IEEE 51 5.1.<br>Part II of this Standard covers the requirements for heat tracing for use with fire suppression sprinkler or standpipe systems.<br>Parts III - IX of this Standard cover heat tracing for use in hazardous locations as defined by the National Electrical Code, ANSVNFPA 70.<br>Heat tracing covered by this Standard is intended for applications where it is exposed to weather, unless specific markings and instructions limit the applications.<br>Heat tracing may be installed on metal or rigid plastic pipes. Unless specific recommendations are made for the plastic pipe material to be heated, plastic pipes are considered to have a maximum long-term thermal exposure limit of 50&#176;C (122&#176;F).<br>Other related equipment standards: <br>a) For Embedded Floor Warming Applications, refer to the Standard for Electric Space Heating Cables, UL 1673. <br>b) For Mobile Home Pipe Heating Cables, refer to Outline of Investigation, Subject 1462. <br>c) For Residential Pipe Heating Cables, refer to Outline of Investigation, Subject 2049. <br>d) For Roof and Gutter De-Icing Cable Units, refer to Outline of Investigation, Subject 1588.<br>A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.