I'm not sure about "Further protection is provided by tripping the output from the charge point if there is any indication of a fault current – extending the concept of RCD protection to this new application" though. Seems to be an "RCD" monitoring just the current through the c.p.c.
While I can see the logic, I can't help thinking there might be a lot of false tripping - e.g. car door touches a steel bollard and so the normal PME diverted N currents have another path to Earth - via the c.p.c. - if they get to a few mA the charge point trips. Maybe even muddy tyres on a wet day, or salty from winter road 'gritting' would provide a suitable path if the PME earth is a few volts above true Earth?
I'm not sure about "Further protection is provided by tripping the output from the charge point if there is any indication of a fault current – extending the concept of RCD protection to this new application" though. Seems to be an "RCD" monitoring just the current through the c.p.c.
While I can see the logic, I can't help thinking there might be a lot of false tripping - e.g. car door touches a steel bollard and so the normal PME diverted N currents have another path to Earth - via the c.p.c. - if they get to a few mA the charge point trips. Maybe even muddy tyres on a wet day, or salty from winter road 'gritting' would provide a suitable path if the PME earth is a few volts above true Earth?
