I NEED SOME HELP WITH THESE TWIST LOCK OUTLETS AND CABLES THAT SUPPLY POWER TO ELECTRICAL EQUIPMENT. WE HAVE A TOUCH SCREEN THAT TURNS ON/OFF OUR EQUIPMENT. WHEN TURNING THE POWER OFF FROM TOUCH SCREEN OUR WORKERS CAN THEN TURN THE TWIST LOCK TO REMOVE THE 240V SINGLE PHASE BEFORE REMOVING THE CABLE TO THE EQUIPMENT [MOTOR- LIGHTS ]. LOOKING AT THE TOUCH SCREEN IS THE ONLY WAY TO SEE IF THE EQUIPMENT IS OFF. THERE IS NO VOLTAGE TEST TO CONFIRM POWER IS OFF BEFORE REMOVING CABLE , MOTOR AND LIGHTS ARE NOT VISABLE. WORKERS ARE NOT ALLOWED IN PANELS. THIS COMPANY WAS TOLD BY MANUFACTURE THIS METHOD IS SAFE BECAUSE THE TWIST LOCK TURNS POWER OFF BEFORE REMOVING CABLE. HOW DO WE SHOW COMPANY THAT A VOLTAGE TEST IS NEEDED BEFORE WORK CAN BE CONE ?
My take from OP description is he has a machine supplied by a cord and plug. They are looking at the screen to verify the machine is not under load before unplugging the cord, maybe not a requirement but not a bad practice either. I think his real question there is that someone thinks they need to verify there is no voltage within the equipment after unplugging the supply cord.
My take is that if they are using a the plug/receptacle as the disconnecting means it has to be within sight of the motor. he seems to be claiming its not.
I suppose one could use a voltage tester on the plug after it was unplugged but that seems sort of redundant.
Personally, I think using a twist lock style plug for this makes sense. The power is disconnected once the twist is made and before the plug is removed from the receptacle so it is about as safe as it can get.
If there is some concern that the equipment is shutdown before unplugging it, make the guy go look at it and make sure it is off first.
I am not sure I get the concern.
I am also unclear as to why they are unplugging the cord, or how often. It seems like they might be doing it as part of operating the equipment, as opposed to repair or maintaining it.