Well, it's an earthed device, which provides a high level of protection as long as your wiring is in order. But an isolation device would be a good extra precaution. Truly abused ones in community darkrooms have given up the ghost, however in 3 decades of selling these, and similar ones we've never had a case of anybody experiencing a shock.
Originally Posted by Fintan
The best arrangement is probably to keep it on duckboards raised away from the bottom of the sink, and give it a good wipedown after use.