IEC 60335-2-55 Ed. 4.0 b:2021

This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric appliances for use with aquariums and garden ponds for household and similar purposes, their rated voltage being not more than 250 V, including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that this standard is applicable to are
– aerators;
– aquarium heaters;
– automatic food dispensers;
– sludge-suction appliances.
Appliances not intended for normal household use but that nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops and in light industry and farms, are within the scope of this standard.