12.2 Replacement:For machines with one or more rated voltages, the machine is operated at each 12.2.1 Replacement:The load conditions for the heating test of 12.2 are as follows:The machine is loaded by the application of a torque until thermal equilibrium is reached.For lawn trimmers, lawn edge trimmers and grass trimmers that cannot be converted to a brush cutter or brush saw in accordance with 8.14.2 a) 104), at the manufacturer's discretion, the torque may be applied by either– an external load; or– extending or modifying the cutting elementssuch that when supplied at rated voltage the machine operates at rated input or rated current.For brush cutters, brush saws and grass trimmers that can be converted to a brush cutter or brush saw in accordance with 8.14.2 a) 104), the torque is applied by means of an external load such that when supplied at rated voltage the machine operates at rated input or rated current.