ETC currents and shock hazard

We are just setting up the components for ETC and I have a question about safety. I noticed people are running currents of up to 800mA through the circulating clearing solution. How safe is this and what measures do you take to prevent shocks? Our water circulator is metal - will this become live during electrophoresis and become a shock hazard?

Sorry if there is an obvious answer to this question, but I can't see it addressed anywhere else in the forum/literature!
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