Trumpy,
regarding the protection of the cables: As I understand it, it will respond to short circuits as well. It's likely it can only handle a fairly limited current. A circuit breaker or fuse after the transformer could be used to catch really bad faults.
On the cable thing: If I take Trumpy's advice on burying the cable, zip-cord might no longer be a very good (safe) choice. I know there is a cable called UF in the US which is used as underground cable. Maybe something like that, but with only one insulated conductor and one bare conductor for neutral/earth? If you need both legs (460V), you'd use two insulated conductors. Input from those familiar with this type of cable is welcome!
[This message has been edited by C-H (edited 11-19-2003).]
