https://www.sis.se/en/produkter/construction-materials-and-building/installations-in-buildings/ventilation-and-airconditioning-systems/ssen603352882/
Standard - Household and similar electrical appliances - Safety - Part 2-88: Particular...
Household and similar electrical appliances - Safety - Part 2-88: Particular requirements for humidifiers intended for use with heating, ventilation or...
electrical appliances safetystandardhouseholdsimilar
https://www.1823.gov.hk/en/faq/service-categories/safety-of-electricity-and-electrical-appliances/periodic-test-for-fixed-electrical-installations
Safety of Electricity and Electrical Appliances - 1823
electrical appliancessafetyelectricity