Electric current/voltage in Sump's water?

[mike31154]

If all you're measuring is 1 to 1.2 volts, you're doing pretty good. I reckon most people have a little more than that. And to clarify, volts & current are two different animals, you don't want to confuse them. With voltage that low, even if you add a grounding probe (which will cause electrical current to flow), the amount of electrical current will be harmless to a healthy human. A GFCI is still pretty much a must for safety reasons though.

Even with no equipment physically in the water, it is still possible to have voltage induced into the water, by fluorescent lights hanging over the tank or sump for example. The electromagnetic field produced by fluorescents and their ballasts will do this.