scope:

This standard applies to 50 Hz and 60 Hz electrical voltage ratings and operating limits as applied to airconditioning, heating and refrigerating equipment, heat pumps, and electric furnaces as well as components.

Exclusions. Voltages less than 100V AC are not included in this standard.

Purpose. The purpose of this standard is to establish, for air-conditioning, heating and refrigerating equipment: definitions; voltage rating requirements; equipment performance requirements; and conformance conditions.