You can quickly check for a ground with a voltage tester before you remove the old outlet. If it has a grounding conductor, it is most likely smaller than the other conductors in the cable. ![]() Non-metallic cable, before it was called Romex, was made with and without a grounding conductor. Metal conduit is grounded if it is installed correctly. With proper fittings, BX cable has grounding through its metal armor. Knob and tube wiring has no grounding conductor. If you have an old house with two prong receptacles, it could have been initially wired by one of several wiring methods available at the time. Even if the MC cable armor is not an approved grounding conductor, the metal armor must still be grounded using approved MC connectors. Some MC cable metal armor may be approved as a grounding conductor, but you would need to check the labeling on the cable to confirm. The BIG question is whether or not you have an approved grounding conductor in the existing outlet box, which would allow you to ground a 3-prong outlet.Īpproved grounding conductors are: A separate wire specifically for grounding purposes, metal conduit, the metal armor of type AC cable (BX), short lengths of flexible metal conduit (FMC), short lengths of sealtight (LFMC), metal enclosures, cable trays, and metal raceways including Wiremold metal raceway.
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