Since this standard is being revised jointly with IEC, this standard will not have a purpose clause.This part of IEC 60079 specifies general and testing requirements for electrical resistance trace heaters for application in explosive atmospheres, with the exclusion of those classified as EPL Ga/Da (traditional relationship to Zone 0 and Zone 20 respectively). The standard covers trace heaters that comprise either factory- or field- (work-site) assembled units, and which may be series trace heaters, parallel trace heaters, trace heater pads, or trace heater panels that have been assembled and/or terminated in accordance with the manufacturer's instructions. This standard also includes requirements for termination assemblies and control methods used with trace heating systems. The explosive atmospheres referred to by this standard are those defined in IEC 60079-10-1 and IEC 60079-10-2. This standard also includes the requirements for explosive atmospheres incorporating the Division method of area classification that may be applied by some users of this standard. NOTE Information on the Division method is given in NFPA 70 and CSA C22.1. This standard supplements and modifies the general requirements of IEC 60079-0 for electrical resistance trace heaters and integral components, with the application or exclusion as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. Where clause numbers may change in future releases of IEC 60079-0, references to those clauses in this standard shall be taken by the description of the clauses.
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