MD84
Senior Member
- Location
- Stow, Ohio, USA
Could someone please help me understand some of the fundamentals behind the operation of a 2 Pole GFCI operating on a 208/120V system. I will be installing (4) 120V receptacles for diesel heaters. I am considering either (2) circuits with each on a single pole GFCI Breaker running a neutral for each or (1) MWBC and sharing the neutral. I am leaning towards the MWBC.
I decided to do some vector analysis to satisfy my curiosity on the 2 Pole option. I was curious what my neutral current would be if 3/4 receptacles were in operation. I found that if I used a value of 20A for one phase and 10A for the other phase I would get about 17A on the neutral. As I understand the GFCI would see this as balanced. My question is what would be the phase angle of the neutral in relation to the other phases? Would the current vectors equal a sum of 0? Please provide an example vector analysis.
I decided to do some vector analysis to satisfy my curiosity on the 2 Pole option. I was curious what my neutral current would be if 3/4 receptacles were in operation. I found that if I used a value of 20A for one phase and 10A for the other phase I would get about 17A on the neutral. As I understand the GFCI would see this as balanced. My question is what would be the phase angle of the neutral in relation to the other phases? Would the current vectors equal a sum of 0? Please provide an example vector analysis.