IEC 60335-2-88 Ed. 2.0 en:2002

Deals with the safety of electric humidifiers intended for use with heating, ventilation, or air-conditioning systems in household, commercial, and light industrial applications (may include large stand alone commercial equipment)which operate according to the evaporative or atomization system, water-injection, steam and the like. The rated voltage being not more than 250 V for single-phase and 600 V for all other appliances.