I ordered an AC volt meter like in this THREAD What kind of wire do I need to use? Does the back side of the meter need to be covered by a receptacle box?
If it is just a volt meter, any insulated wire rated for more than 120 volts would be fine. Voltmeters do not draw hardly any current. As for whether you need a box or some sort of a backing plate, depends on the meter you get. You don't want it being possible for anything to short out the terminals on the back of the meter.
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