Study isolation transformers in detail till you understand what type for what task,
how to test the actual level of input to output 'isolation', chassis relations,
and that it will do the task before using it,
but not before understanding the source of the incoming power from your mains switchboard first, the earth bond/grounding thing etc
It's actually SUPER SIMPLE even using generic isolation transformers once you have understood the above,
with the wiring option of various degrees of 'isolation' from the mains and or connected suspect equipment etc
My rig has the option of any type of isolation needed,
regulated, varied or limited AC,
and options to use GFCI or RCD,
and be able to externally test trip them also to ensure they actually do work
i.e. If risky business

I simulate the snafu first, then hook up and power up
and there's a UPS rig too but that's another story as to how it's transformer works on backup disconnected from the mains
My intentions when learning about this stuff were really to be personally 'isolated' from hospital beds
and or a one time permanent earth/ground connection, after a few good overconfident idiot zaps and walkaways over the years.

'Isolation' has way too many variables for people unfamiliar with all the voodoo and confusion,
to either zap their equipment and themselves,
or cop spark shrapnel in the eyes,
or worse still, send panic'd kitty and fido packing down the street
into an oncoming beer swilling, bad hair day, 'friday tradie' ute, with cranked up mindless detuned metal mayhem trash.
Isolation: No research? = No Do !
