During a call to a customers they mentioned a problem with operators plugging a fan or vacuum into the unused outlet of a duplex programmer/network switch outlet, shutting the PLC/HMI comm's down when they trip the breaker.
They wanted to be able to use the port for a laptop, but turned off (not by a switch) the operators would see and try to turn on.
What I came up with was I split the duplex outlet, ran 2 wires out the back of the DIN mount outlet box and ran them to terminals 3 & 6 of an octal outlet, then took an old timer and ground off the locater pin and put it in normally.
When they want o use the outlet they just pull the timer, turn it two pins counterclockwise and plug it back in - now the outlet is powered through the NC contact from 8 to 5.
They wanted to be able to use the port for a laptop, but turned off (not by a switch) the operators would see and try to turn on.
What I came up with was I split the duplex outlet, ran 2 wires out the back of the DIN mount outlet box and ran them to terminals 3 & 6 of an octal outlet, then took an old timer and ground off the locater pin and put it in normally.
When they want o use the outlet they just pull the timer, turn it two pins counterclockwise and plug it back in - now the outlet is powered through the NC contact from 8 to 5.