IEC 60335-2-91 Ed. 2.0 en:2002

Applicable to safety of mains-operated walk behind and hand held lawn trimmers and lawn edge trimmers, with cutting element(s) of non metallic filament line or freely pivoting non metallic cutter(s), with a kinetic energy of not more than 10 J each, rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances.