For walk-behind trimmers, the test is conducted with the machine placed on an unperforated flat horizontal surface and if the cutting height is adjustable, at both the minimum and maximum cutting height.All machines are fitted with the cutting means or cutting accessory and operated at maximum speed at no-load until maximum temperature is reached or the machine no longer operates due to the battery being discharged.The most unfavourable conditions are determined using the cutting means or cutting accessory in accordance with 8.14.2, which yields the highest temperature on the surface of the external enclosure.During the test, protective devices shall not operate. The temperature rises shall not exceed the values shown in Table 2.K.12.2 This subclause of Part 4-4 is not applicable.K.12.2.1 This subclause of Part 4-4 is not applicable.