Regarding "Emergency Switching Off," please provide examples of "One single action only." What is "One single action only?" What types of devices are suitable for such use allowing one single action only? 465.3.
e.g. push, pull, twist, or is it? Normally you would push (hit, kick) an emergency stop button. Arguably, if you have to grip it first, and then pull or twist, it is 2 actions. Rotating a lever could be achieved in one action because it would not necessarily have to be gripped first.
If you think of a (modern) door handle (as opposed to an old-fashioned knob), it can be operated by pressing one's knee or foot on it if, for example, you are carrying something with both hands. Of course, that doesn't help if you are on the same side as the hinges; and it is not the intended means of operation in any case. If it was intended to be foot-operated, it would be a door pedal rather than a handle.
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