[Test-Equipment] Mains protection for work bench test equipment?

[davec]

>HI, this thing about test benches needs another note, I like to have
>isolation from the rest of the house so each bench is fed to a
>Wiremold plug strip thrru an isolation tx.
>[...]
>
>JACK IVERSON

Excuse the really basic question, but what's the advantage of 
isolation for the bench power?

Dave