This emergency stop button appears to indicate that the red button must be rotated clockwise to operate it to the OFF position. Should it not be marked PUSH, so that anyone knows what to do to operate it in an emergency?
Z.
The OP referred to the arrows, which is a slightly different matter. In fact, does it matter? I know that to start some of my machinery, I have to twist the stop button before pressing the green one. I can feel which direction is effective, I do not need to look. Actually, it is clockwise; so clockwise to go, but when I want water, I turn the tap anti-clockwise.
On the road: green for go, red for stop. In my DB, red for go and green for stop. I acknowledge that green = safe electrically, but back to the traffic lights. Pelican crossing: for the pedestrian, green = safe (and go). For the driver red = stop (and safe for the pedestrian). Green does not mean go for the driver, but may do so if safe (it's in the legislation).
Brake lights are red.
So I think that Zoomy makes a good point. For most people, anything red = stop; green = go.
So presumably they are familiar with the use of emergency stops as they have been instructed in their use. If the emergency stops are clearly marked EMERGENCY STOP and PUSH TO STOP is present, then all is clear. But what if they are not marked, or indication as to which part of the plant or to which machine they control is unclear? Or how to use them is confusing. Do you rotate the red knob with arrows on it in an emergency? You are trained and skilled in their use. Others may not be. And in a panic situation things need to be crystal clear.
Z.
I'm a bit confused, the stop button in the link is a standard 'push to stop' and twist to reset
In my experience, this is how they all are, and on a machine, once pressed, they have to latch, requiring a manual reset. Once the stop circuit has been reset, the machine can then be started again.
The button being on the equipment that it stops is the giveaway as to what it stops in most cases. I imagine on some large production lines it might be a bit more vague, but I think anyone would expect to press the red button and it will stop the machinery in front of them
I have to say, I don't think ours have signs with them, but, as we know, green indicates a safe condition, so common sense tells you it should be green
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