Electrophoresis equipment can pose significant electrical hazards in the laboratory. Typical electrophoresis units operating at 100 volts can provide a lethal shock of 25 milliamps.

This document is a guideline for working with such electrical systems and talks about-
1. Power supplies
2. Connecting leads
3. Various hazards involved and
4. Controls

https://www.dropbox.com/s/wddy3d3492viisx/June%202014%20Electrophoresis%20Safety.pdf?dl=0