Could an unfused R.C.D. protected spur, from a complient ring final circuit, supplying a single outdoor socket via 1.5mm2 6242Y cable of max. length 300mm through a brick wall from an indoor socket outlet be considered compliant?
I have just thought of something else, why is the energy let through less for lower rated breakers, say 6A? The energy needed to operate the mechanism is probably the same for all ratings, so the 6A one needs to get the same magnetic field from less current. This requires more turns of thinner wire, exactly what one will find if a few are dismantled, The energy let through is less because operation will be faster with the fault current allowed and more turns. In principle if one makes the coil have more turns the energy let through can be set as required, the constraint is then the space available and the acceptable energy (voltage) loss across the coil inductance. Some manufacturers do have physically larger products available for less let through energy. Inside MCBs are fairly crowded if they fit the usual profile, thus BS 80898 ratings with minor deviations.
I have just thought of something else, why is the energy let through less for lower rated breakers, say 6A? The energy needed to operate the mechanism is probably the same for all ratings, so the 6A one needs to get the same magnetic field from less current. This requires more turns of thinner wire, exactly what one will find if a few are dismantled, The energy let through is less because operation will be faster with the fault current allowed and more turns. In principle if one makes the coil have more turns the energy let through can be set as required, the constraint is then the space available and the acceptable energy (voltage) loss across the coil inductance. Some manufacturers do have physically larger products available for less let through energy. Inside MCBs are fairly crowded if they fit the usual profile, thus BS 80898 ratings with minor deviations.
