Trumpy the newer Din Rail boards in NZ may not have a 2 pole main switch because the ripple relay is fed from an MCB in the board via a 2 core cable and then returns to feed the HWC circuit.
The old system had the meter and ripple relay at the switchboard and a 2 pole main switch.
Back then the meter readers had keys to your house ( if Mum was working ) and would let themselves in once a month to read the indoor meter.
