The scope includes specific test requirements for qualifying electrical resistance heating cables and heating devices for use in industrial applications, as well as a basis for electrical and thermal design. Applications include unclassified, and both North American Division and Zone classified areas. The purpose of this standard is to provide industry with the basic mechanical and electrical requirements for a reliable heating system and to also provide information and requirements for design, installation and maintenance. The standard is being revised for closer harmonization to IEC standards and updated per the 5-year review cycle. Revision Standard - Superseded. Specific testing requirements for qualifying electrical resistance heating cables and heating devices for use in industrial applications, as well as a basis for electrical and thermal design, are included. Applications include unclassified, and both North American and Zone classified areas.