The role of standards in predicting trace heating sheath temperatures

Often misunderstood, Standards play a key role in predicting trace heating sheath temperatures for applications in explosive atmospheres. This paper will examine the accuracy and application of using the procedures outlined in the current IEC and IEEE Standards. Accurately predicting trace heating sheath temperatures is a key component in the safety, reliability and cost of a trace heating installation. The type test outlined in the current IEC and IEEE Standards are also a key component in third party certification of trace heating for use in explosive atmospheres. This paper will also address the procedures used by certification bodies and test laboratories in verifying the accuracy of a manufacture's design calculations and installation recommendations.