will need 10.0 or 16.0mm2 for Volt drop limitation at 20 Amps over 65 metres.
No it won't - 16mmsq is more than you need to supply a small house or flat !!
It's not a lighting-only circuit, so the larger volt drop figure applies. You may need 6mmsq, not more.
Selectivity between 20A and 16A is not guaranteed, and wont be for fuses either, though if you accept the overload case being limited by the breakers at the load end, then the source end protection only needs to handle short circuits in the cable, and disconnect in 5 seconds or less for a short at the far end just before the load end breakers, so the source end MCB could be 32A.
will need 10.0 or 16.0mm2 for Volt drop limitation at 20 Amps over 65 metres.
No it won't - 16mmsq is more than you need to supply a small house or flat !!
It's not a lighting-only circuit, so the larger volt drop figure applies. You may need 6mmsq, not more.
Selectivity between 20A and 16A is not guaranteed, and wont be for fuses either, though if you accept the overload case being limited by the breakers at the load end, then the source end protection only needs to handle short circuits in the cable, and disconnect in 5 seconds or less for a short at the far end just before the load end breakers, so the source end MCB could be 32A.
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