Final answer:
An important safety precaution to remember about the interface unit when working with high-power electric circuits is to work one-handed or keep one hand in your pocket.
Step-by-step explanation:
An important safety precaution to remember about the interface unit when working with high-power electric circuits is to work one-handed or keep one hand in your pocket. This is a sensible suggestion because it helps to prevent electrical shock. By keeping one hand away from the circuit, you reduce the risk of completing a path for electric current through your body.