With the power switch in the "off" position, a 25 mm diameter x 75 mm long steel rod with a force not exceeding 20 N is applied to the lock-off device in any direction. The steel rod shall be applied such that its cylindrical surface bridges the surface of the lock-off device and any surface adjacent to the lock-off device. During the test, it shall not be possible to actuate the power switch with a force not exceeding 20 N.