Mike Dolt Enterprises
Mike Dolt Enterprises
User: rgoodwinelectric, Location: Chapel Hill, NC
Asked on: Monday, March 21, 2011 at 7:42 am EDT
Answered on: Tuesday, May 14, 2024 at 3:03 am EDT
Question: I'm currently in Afganistan and was told to install a GFCI Circuit breaker for the water heater circuit. The circuit is a 208v circuit with no nuetral/ only 2 hots and ground. I was given a box of 120v single phase GFCI breakers. I know this is an odd questions, but will this application work using two 120v GFCI breakers to protect a 208v circuit with no Nuetral ? (I'm aware there is no common trip)
No, this application will not work using two 120V GFCI breakers to protect a 208V circuit with no Neutral.
GFCI (Ground Fault Circuit Interrupter) breakers require a Neutral wire to function properly. The Neutral wire provides a reference point for the GFCI to monitor current flow. Without a Neutral wire, the GFCI cannot detect imbalances in current flow and will not trip in the event of a ground fault.In the case of a 208V circuit with no Neutral, it is not possible to install GFCI protection using standard single-phase GFCI breakers. Specialized GFCI devices designed for use on 208V circuits with no Neutral are required. These devices typically use a combination of voltage sensing and current sensing to detect ground faults.Do not attempt to install 120V GFCI breakers on a 208V circuit with no Neutral. This could result in the GFCI breakers not functioning properly and potentially creating a hazardous situation.If you are unsure about how to properly install GFCI protection on a 208V circuit with no Neutral, it is highly recommended that you consult with a qualified electrician. Flag for review