On Sat, 16 Oct 2004, Joe wrote:

The same reason as isolation transformers are used for power tools outdoors.
Yes, you can use circuit breakers of various types, but an isolation
transformer can't go wrong.

But if it DOES go wrong... There is potentially 480 volts available if one
side of the floating secondary contacts the live side of of the mains....

--
Alistair Riddell - BOFH
Microsoft - because god hates us