IEC 60519-10-2005 pdf – Safety in electroheat installations – Part 10: Particular requirements for electrical resistance trace heating systems for industrial and commercial applications.
1 Scope and object 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 for connection to voltage supplies up to and including 450 V / 750 V. NOTE This is less than the voltage range of IEC 60519-1. Higher voltages are under consideration. 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. These applications do not include or provide for any applications in potentially explosive atmospheres. This standard 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 will be detailed in separate documents that are under consideration (see Introduction). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-841, International Electrotechnical Vocabulary (IEV) – Part 841: Industrial electro- heat IEC 60364-1, Electrical installations of buildings – Part 1: Fundamental principles, assess- ment of general characteristics, definitions
IEC 60364-5-51, Electrical installations of buildings – Part 5-51: Selection and erection of electrical equipment – Common rules IEC 60446, Basic and safety principles for man-machine interface, marking and identification – Identification of conductors by colours or numerals IEC 60519-1:2003, Safety in electroheat installations – Part 1: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-841, IEC 60519-1 and the following apply. 3.1 ambient temperature average temperature of air or another medium in the vicinity of the equipment [IEV 826-10-03] 1 NOTE Where electrical trace heaters are enclosed in thermal insulation, the ambient temperature is the temperature exterior to such thermal insulation. 3.2 branch circuit that portion of the wiring installation between the overcurrent device protecting the circuit and the trace heater(s) 3.3 connections (terminations) 3.3.1 end termination termination, which may be heat producing, applied to a trace heater at the end opposite that where the power is supplied 3.3.2 integral components factory fabricated or field assembled electrical terminations and connections, such as heat shrink terminations, moulded end seals or splices, which conform to the general shape of the trace heater and are exposed to the same environments as the trace heater 3.4 factory fabricated unit or set trace heater cable, tape or device, including the necessary terminations and connections, assembled by the manufacturer 3.5 field assembled unit or set trace heaters supplied in bulk with terminating components to be assembled at the work site 3.6 heat loss energy flow from a pipe, vessel or equipment to its surroundings
3.7 heater pad trace heater comprising series or parallel connected elements having sufficient flexibility to conform to the shape of the surface to be heated 3.8 heater panel non-flexible trace heater comprising series or parallel connected elements fabricated to conform to the general shape of the surface to be heated 3.9 minimum ambient temperature lowest ambient temperature specified at which the trace heater is operable and performs according to specified requirements 3.10 sheath uniform and continuous metallic or non-metallic outer covering enclosing the trace heater, used to provide protection for the cable against influence from the surroundings (corrosion, moisture, etc.) 3.11 sheath temperature temperature of the outermost continuous covering that may be exposed to the surrounding atmosphere 3.12 temperature sensor temperature sensing element device designed to respond to temperature providing an electrical signal or mechanical operation 3.13 thermal insulation material having air- or gas-filled pockets, void spaces, or heat reflecting surfaces that, when properly applied, retards the transfer of heat 3.14 trace heater device designed for the purpose of producing heat on the principle of electrical resistance and typically composed of one or more metallic conductors or an electrically conductive material, suitably electrically insulated and protected NOTE This may be in the form of a trace heater cable, heater panel or heater pad. 3.15 trace heater cable circular or flattened cable shaped construction with one or more discrete or continuous electrically insulated heating elements 3.16 trace heater unit trace heater set series trace heater cable, parallel trace heater cable, heater pad or heater panel suitably terminated in conformity with the manufacturer’s instructions