Hand-Off-Auto switches

Does NFPA-79 apply to pumps?

Read the very first page or so and I believe it is very specific about what it applies to. I don’t have a copy handy but I seem to remember that it doesn’t cover pumps.

NFPA 79 - electrical standard for industrial machinery. the concept of protecting all facilities equipment is there and i would say yes, it applies.
james

I may be reading that differently but to me it is referring to the emergency stop command.

If you press an E-Stop (Command) it is not possible to reset that command elsewhere. So a latching E-Stop button ensures you are local to the area the estop command was initiated.

The reset of the command (unlatching) will not restart the equipment but will allow the complete E-Stop circuit to be reset from wherever which would in turn allow the machinery to be restarted.