wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
Say I have a 2 wire 120V circuit going to a piece of utilization equipment, and say there's no connection between the equipment and earth or any bonded metal (in particular no EGC).
1) Can a non-faulty GFCI nuisance trip in this situation, and what is the physics by which this happens?
2) Kirchhoff's current law is instantaneously obeyed at all points in time, yes? There aren't circuit elements that can say accumulate electrons during one part of the cycle and release them during another to actually introduce a difference in the currents in the two wires, right?
3) So then I infer that certain aspects of the current waveform through the CT in the GFCI are able to induce a signal in the control circuitry even though the difference in the currents is always zero? E.g. high frequency harmonics?
Thanks,
Wayne
1) Can a non-faulty GFCI nuisance trip in this situation, and what is the physics by which this happens?
2) Kirchhoff's current law is instantaneously obeyed at all points in time, yes? There aren't circuit elements that can say accumulate electrons during one part of the cycle and release them during another to actually introduce a difference in the currents in the two wires, right?
3) So then I infer that certain aspects of the current waveform through the CT in the GFCI are able to induce a signal in the control circuitry even though the difference in the currents is always zero? E.g. high frequency harmonics?
Thanks,
Wayne