scope:

This standard sets performance requirements for permanently installed electric heaters, electric air heaters, immersion (paint, fluids, etc.) heaters, heating elements and catalytic heaters rated 600 volts or less. This standard does not apply to electric trace heating.

The requirements of this standard reflect tests and practices used to examine characteristics of electric and catalytic heaters for hazardous (classified) locations for the purpose of obtaining certification. Electric and catalytic heaters for hazardous (classified) locations having characteristics not anticipated by this standard may be certified if performance equal, or superior, to that required by this standard is demonstrated

The standard is intended to be used in conjunction with FM Approvals Examination Standard 3600 - Electrical Equipment for use in Hazardous (Classified) Locations, General Requirements, which includes the general requirements that apply to all types of hazardous (classified) location protection methods.

Purpose

This standard states testing and certification requirements for electric and catalytic heaters for hazardous (classified) locations; herein referred to as heaters.

Testing and certification criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.