Accident is absolutely the wrong word. It shows your ignorance of the difference between accident, “event that occurs by chance”which does not presume that other choices have been made (in this case not following HSE guidelines)
and incident that is “something dependent on or subordinate to something else of greater or principal importance”
The incident that happens because you did not follow best practices that you know of, or are required to know of, outlining by the HSE absolutely, depends on something “of greater or principal importance”
Guards on saws are of greater or principal importance, precisely to prevent incidents of bodily injury.
If you have a guard that is to all appearances and usual tests in good condition that breaks under normal usage and that allows injury while the machine is being operated in an otherwise safe manner, then you can correctly call that an accident.
So do please brush up on your grammar before trying to police your misconceived idea of differences in meaning.