UL Standard for Safety Gasoline-Engine-Powered@ Rigid-Cutting-Member Edgers and Edger-Trimmers (Fourth Edition; Reprint with revisions through and including November 16@ 2011)
These requirements cover walk-behind gasoline-engine-powered@ ground-supported edgers and edger-trimmers that employ rigid cutting members@ the diameter of which is not more than 12 in (305 mm). These requirements also cover hand-supported@ portable@ gasoline-engine-powered edgers having at least one ground-support and employing a rigid cutting member that has a diameter of not more than 12 in (305 mm). These requirements do not cover gasoline-powered edgers and edger-trimmers that employ a cutting means: a) That has a maximum tip-speed of more than 12@000 surface ft/min (3660 surface m/min); or b) That is made of nonmetallic flexible line. These requirements do not cover accessories or attachments provided for the purpose of digging or cutting materials other than earth and grass.