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P844.1 - 844.1/CSA C22.2 No.293.1:Standard for Skin Effect Trace Heating of Pipelines, Vessels, Equipment, and Structures - General, Testing, Marking, and Documentation Requirements

This standard provides testing, marking, design, and documentation requirements for skin effect trace heating systems. Skin effect heating systems are intended to: a) Maintain design temperature b) Provide electrical, thermal, and mechanical durability and reliabilityThis standard applies to general, testing, marking, and documentation requirements for skin effect trace heating systems rated up to and including 5 kVac and 260 degC maximum skin effect insulated conductor temperature. These heating systems are intended for installation in accordance with the Canadian Electrical Code, Part I (CE Code), National Electrical Code (NEC) in the U.S., or with any other national electrical installation code, as applicable. This standard applies to skin effect trace heating systems intended to be installed in ordinary and hazardous locations. The hazardous locations include the following: - In Canada Zone 1; Zone 2; Zone 21; Zone 22; or Class I, Division 2; Class II, Division 2; Class III, Division 2 as described in CSA C22.1. - In the U.S. Class I, Zone 1; Class I, Zone 2; Zone 21 and Zone 22; or Class I, Division 2; Class II, Division 2; Class III, Division 2 as described in NFPA 70. This standard also applies to termination assemblies and control methods used with skin effect trace heating systems. NOTE- a) Requirements for certification at voltages above 5 kVac or skin effect insulated conductor insulation temperatures above 260 degC may be considered under a special investigation by an accredited certification body. b) Information on transformer, power distribution, and controls components can be found in IEEE 844.2/CSA C293.2.
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