This months CAMC Mag explains the change. Apparently the EHU must have an interlock to prevent plug insertion and extraction when the socket is live. Thus the MCB is designed to trip every time the plug is extracted. The reason is to avoid arcing and accidental contact with live conductors. I haven’t seen this set up yet.
I imagine the Wardens will be busy flicking switches 😜
I imagine the Wardens will be busy flicking switches 😜