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Description / Abstract:
This part of IEC 60079 provides guidance for the application of
electrical resistance trace heating systems in areas where
explosive atmospheres may be present, with the exclusion of those
classified as requiring EPL Ga/Da (traditional relationship to Zone
0 and Zone 20 respectively). This standard also provides guidance
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.
It provides recommendations for the design, installation,
maintenance and repair of trace heating systems including
associated control and monitoring equipment. It does not cover
devices that operate by induction heating, skin effect heating or
direct pipeline heating, nor those intended for stress
relieving.