I have noticed that a room in my house is improperly grounded, and it needs to be redone. We do know that most of the wiring is made with a single core, copper wire. Would there be a hazard with using a multi core (speaker) wire for the grounding, or should we do the wiring with a single core wire.
No professional electrician would ever use speaker wire to wire a house.
Because it's stiffer. It's also a better conductor. Stranded wire would usually have to be in conduit. I would not use speaker wire anywhere in my home for grounding. It's against the electrical code in every state. Do it right the first time.
multi-stranded wire is used when flexibility is needed such as pulling a wire through a conduit with multiple bends, the wire size depends on how many amps there will be and you circuit breaker must be sized correctly. NO!! you cannot use speaker wire because the insulation on the wire is not made for the higher voltage, a speaker may use around 24V while a home uses 120V or 240V. yes you can use multi-stranded wire in the same manner you use solid core as long as it is sized correctly for the amperage and over-current protection device (circuit breaker or fuse).... and the insulation type depends on the location and voltage it will be used for, for homes there is not much to worry about, but if it will be used around chemicals, oils or other petroleum products... or for high voltages the insulation type must be chosen accordingly.... solid core is easier to work with in a residential home because it holds its shape when running through joists or going around a bend.... stranded wire would almost act like wet spaghetti and need to be secured more than required by code and is normally contained in some type of conduit.
