When plugged in the AC iPurifier, the polarity LED shows red systematically. For example, Hong Kong uses the same plug as UK. Far from being out of phase as the polarity LED indicated. Should I ask an electrician to rewire the Neutral and the Hot?
Answer: AC phase is defined for all systems.
As we do not offer a US to UK plug, but we do with EU to UK, therefore, you are likely using some form of adapter. You need to make sure the adapter takes phasing into account. If the phase is wrong it means a wire expected to have no voltage has the full mains and one that is expected to have full mains voltage has non. With some power supply designs, this can cause meaningful differences with ground noise, with others it does not.
