Dspark:
It's possible to buy ready-made extensions using 0.75 sq. mm conductors for light use, but most store-bought types are medium-duty using 1 sq. mm, which is just slightly larger than #18 (we don't use AWG). These are generally fitted with a 5A fuse in the plug.
Heavier extensions are 1.5 sq. mm, which is about 15% larger than #16. Remember that everything here is 240V, not 120, so it's only half as much current for the same amount of power.
Sparky:
The 1:1 xfmr is intended to remove any reference to ground from the razor supply. Remember that our "hot" line is 240V to ground. The secondary is completely isolated from both the primary and from ground, so im theory there's no path for shock current even if someone conacts one side of the razor wiring.
I think the Regs. are in danger of being too strict on this. Which is better: A bathroom outlet suitably placed away from the tub and protected by a sensitive 10mA GFI, or a trailing extension which may be plugged into a outlet with no GFI protection at all?
