What two types of receptacles may be used to replace a defective receptacle in an older home that is wired with knob-and-tube wiring where no equipment grounding means exists in the box?
When dealing with knob-and-tube wiring in an older home where no equipment grounding means exists in the box, you have a couple of options for replacing a defective receptacle. These options are specifically designed to accommodate the specific conditions of knob-and-tube wiring.
1. Self-grounding receptacles: These are receptacles specially designed with built-in grounding contacts. They can be used in situations where no equipment grounding means exists, such as in a knob-and-tube wiring system. Self-grounding receptacles create a grounding path by utilizing the metal mounting screws that secure the receptacle to the junction box. The screws make contact with the metal box, which acts as a grounding conductor. This solution provides a safer installation while complying with electrical codes.
2. GFCI (Ground Fault Circuit Interrupter) receptacles: Another option is to use GFCI receptacles. Although GFCI receptacles do not provide a grounding function, they offer an additional layer of safety by protecting against electrical shocks. GFCI receptacles constantly monitor the flow of electrical current and can quickly detect any imbalances. If a fault or ground fault is detected, the GFCI will shut off the power to prevent electrical accidents. While GFCI receptacles may not offer a true ground connection, they can be used as a safer alternative in situations where a true equipment grounding means is not available.
When replacing a defective receptacle, it is essential to follow proper safety procedures and ensure the correct wiring connections are made. If you are unsure or uncomfortable working with electrical systems, it is always recommended to consult a qualified electrician for assistance.