The load conditions for the heating

The load conditions for the heating test of 12.2 are as follows.The test is conducted with the machine mounted on an unperforated flat horizontal surface with the cutting means attached, and with the minimum size of openings for connection to the torque load. The traction drive wheels, if any, are lifted the minimum amount required to avoid contact with the unperforated flat horizontal surface. The lawnmower is operated with a torque load applied such that rated input or rated current is drawn until thermal equilibrium is reached under the most unfavourable conditions. For machines with more than one motor (i.e. separate motors for the cutting means and traction drive), the lawnmower is operated with torque loads such that rated input or rated current of each motor in accordance with8.1.101 is drawn until thermal equilibrium is reached under the most unfavourable conditions. IEC 62841-4-3:2020 © IEC 2020 – 17 –For lawnmowers employing non-metallic filaments or one or more pivotally mounted cutting elements as the cutting means, at the manufacturer’s discretion, the torque may be applied by either• an external mechanical load; or• extending or modifying the cutting elementssuch that when supplied at rated voltage, the machine operates at rated input or rated current.The most unfavourable conditions are determined using the configuration of attachments and cutting means in accordance with 8.14.2, which yields the highest temperature at a reference location when evaluated at both minimum and maximum cutting height. This determination may be made at one of the required voltages of 12.2 using thermocouples.The reference location is chosen on the motor assembly at a location that minimises the cooling effect of air flow.NOTE A measurement of the rotating speed of the cutting means during the heating test is needed in some cases for the test of 17.2.