Plug in a device switch it on press the test button on the receptacle shutting off the device and then the reset button turning it back on to confirm its correct operation. Is it enough to buy some wire and connect them to the nearest outlets ground wire.

How To Choose And Install A Programmable Wall Switch Timer
How to ground a switch. Replace an older switch with a newer one that has a ground screw and connect it to a ground wire. Cut away a little bit of drywall under the box to provide clearance for the clip. What gauge wire do i need. If your electrical cables have metal sheathing that runs all the way to the panel the sheathing can serve as a ground path. The router and switch both come with grounding screws so i figured id ground them. There is only the single 3 wire plus ground in the downstairs switch box and only two 2 wire plus ground cables at the fixture.
The steps are basically the same for how to install a switch. If you have provided a ground to the receptacle you may also use your external tester with a gfci test button to test the gfci function. Drive a ground screw into the back of the box and then attach the ground wire to that you can get a fine pitch self tapping ground screw garvin gsst or equivalent part and drive it into the back of the box even if there is no tapped hole there then simply attach your ground wire to the screw. When nothing is hooked up there is power in the 2 wire plus ground cable on the upstairs switch. How to ground in switches most older switches are not grounded. Length of bare copper wire onto the metal box with a screwdriver.
Press a grounding clip and 6 in. Couple of years ago i had to ground and outdoor antenna and that called for 10awg but that seems like massive overkill. If you use the chassis ground screw you typically connect it to a grounding bus bar mounted on the wall which is then connected to an earth ground. Alternatively you might consider connecting the ground terminal to a water pipe by means of an exposed ground wire. If you dont have a bus bar in your setup you might be able to cheat by wiring it up to the grounding prong or center screw of an electrical outlet. Recent codes call for switches to be grounded.
Dont rely on metal sheathing or an exposed ground wire. Many switches do not even have a ground screw. The two switches appear to be connected by a 3 wire plus ground cable.