If testing reveals your box isn’t grounded, you can still install the dimmer, but you must use a plastic cover plate and make sure no bare metal parts are exposed. Then place the leads of a voltage tester between each screw terminal and the metal box. If the tester lights, the box is grounded.Click to see full answer. In this regard, will a dimmer switch work without a ground?Sometimes in an older home or apartment, you may have a switch box that has no ground wire. In that case, an exception in article 404.9(B) of the current National Electric Code (NEC) allows a dimmer without a connecting ground wire to still be installed if it is a replacement.Secondly, what happens if I don’t connect the ground wire? The appliance will operate normally without the ground wire because it is not a part of the conducting path which supplies electricity to the appliance. In the absence of the ground wire, shock hazard conditions will often not cause the breaker to trip unless the circuit has a ground fault interrupter in it. Furthermore, what happens if you don’t ground a light switch? Going without a ground wire When you screw the light switch in, it will make contact with the box, and as long as the box is grounded, it will pick up ground that way. If the box isn’t grounded, the switch will still work.Does a switch need a ground?If you are replacing a switch a ground is not required, as per the above exception. However, if you’re installing a switch; replacement or otherwise, into a metal box that is grounded. The switch will be ground via the devices yoke and mounting screws. So if the metal box is grounded, the switch is also grounded.

ncG1vNJzZmivp6x7pLHLnpmroaSesrSu1LOxZ5ufonuotI6wn5qsXZ2usbzEp6pmoZZixrDBjJ2mp6xdnL%2Bwwc2dZJpllJ66rrHRZqqwoaSYtW5%2Bjg%3D%3D