"17 edition"consumer units still being sold.

This is a severely misleading video. Whilst what he says is correct, DC leakage is not a normal phenomenon in installations. We have discussed it in car charging at length because there it is possible due to the car communications system with the charger and a single fault, but it is probably not possible with other electronic loads which never leak DC because the design runs with AC! Asymetric AC and other things do not result in DC (and it needs to be pure and smooth) leakage. If someone can design a load which results in actual DC leakage I would be most interested to simulate it, and in normal PSU designs multiple faults would be needed to even start to get to this problem. It can happen with cars because the car CPC is used as a DC signal return, but it still needs a short from the signal wire to neutral to cause a problem. A short to live would destroy the signalling system, and probably be very expensive to fix, and unless there is no neutral to Earth voltage a N-signal fault would also probably be damaging.

This is a severely misleading video. Whilst what he says is correct, DC leakage is not a normal phenomenon in installations. We have discussed it in car charging at length because there it is possible due to the car communications system with the charger and a single fault, but it is probably not possible with other electronic loads which never leak DC because the design runs with AC! Asymetric AC and other things do not result in DC (and it needs to be pure and smooth) leakage. If someone can design a load which results in actual DC leakage I would be most interested to simulate it, and in normal PSU designs multiple faults would be needed to even start to get to this problem. It can happen with cars because the car CPC is used as a DC signal return, but it still needs a short from the signal wire to neutral to cause a problem. A short to live would destroy the signalling system, and probably be very expensive to fix, and unless there is no neutral to Earth voltage a N-signal fault would also probably be damaging.