Historical
IEC 60335-2-98 Ed. 2.0 b:2005
Household and similar electrical appliances - Safety - Part 2-98: Particular requirements for humidifier
"Deals with the safety of electric humidifiers for household and similar use, their rated voltage being not more than 250 V for single-phase and 480 V for other appliances. Examples of appliances that are within the scope of this standard are appliances that atomize water; appliances that evaporate water by heating and appliances that blow air through a moist element. "
International Electrotechnical Commission [iec]