We are currently embarking on renovating our kitchen and in the process of getting sub trade quotes. The kitchen company we are using has said we need to get an isolated power supply for our microwave oven.

We are going to use our existing microwave as it is only  few months old. This microwave is currently plugged into a standard wall outlet.  It is going to be  inset into a cabinet in the new kitchen. 

Is this correct that the microwave now has to use an isolated outlet?