I have a water heater that gets electricity from a dryer cord plugged into an outlet on the wall.
I need to remove the outlet and replace it with permanent wiring and some form of quick disconnect.
Based on a conversation with my local inspector the best way he thought to get this done is to use the following:
- 1 gang box extender (like this or this),
- 2 pole 30 amp switch (example) mounted on the face of the extender
- Connect one end of a whip (example) to the bottom of one of the 1/2" hubs/knock out
- Connect whip to the top of the hot water heater
I am only able to find a few types of handy box extensions and they are all made of metal.
My existing box is non-metallic and so doesn't have a grounding screw.
The extensions don't have spots to screw in a grounding screw as I guess they assume they are being screwed into a metal box that is grounded and so they expect to be grounded through the screws used to attach them.
How can I ground the extension so that I don't have an ungrounded metal handy box/junction box extension?
Ps, if you feel this is the wrong way to do this in the first place add a comment and I will ask a separate question more generally about the best way to go from a hot water heater hooked with with a dryer plug to something code compliant.