Open following link for wiring diagram with written instructions.
Some of your wiring does not sound up to code.
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.htm1) Two differences between regular switch and cooper 277
-Different color screws: Regular switch has two brass screws, and either wire can connect to either screw. Cooper 277 has dark, brass, silver screws, and hot wire connects to dark screw, and wire to light connects to brass screw.
-Cooper needs neutral wire connected to silver screw, to power the indicator light.
2) Some of the wiring in your box does not sound up to code.
Bare ground wire should not be connected to black and white wires.
Electrician should check this out.
Probably the ground wire is being used as a Neutral. Bare ground wires and white neutral wires both connect to neutral busbar at main breaker box.
Thanks for the suggestions, but because my description lacked specifics my question hasn't been answered. Please allow me to be more specific. Cooper wiring device TR7730 is a tamper resistant combination switch/outlet. This combination device is being installed as the last receptacle on a circuit. It follows a regular two plug GFCI protected outlet which works perfectly. Therefore a GFCI should not be necessary since it has protection from the proceeding outlet. A description of the connectors on the TR7730 (as viewed looking at the face of device; switch above outlet) Right side top screw is brass. The next two screws are black (which have a removable bridge) Left side midway down there is the green ground screw. Below that is silver screw. Hope this defines the device well enough. Look forward to your solution. Thx
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