When working on a circuit, is it safe practice to put yourself in series between two points of different potential?

• A. No
• B. Yes
• C. Sometimes
• D. Only with permission

Answer: (A)

Never place yourself in series between two points of different potential. When you become part of the circuit, your body provides a path for current to flow from one point to the other. The voltage difference will drive current through you, and the amount of current depends on both the voltage and your body's resistance. Even modest voltages can push dangerous currents through the body, potentially causing a painful shock, burns, muscle paralysis, or fatal arrhythmias.

The safe approach is to de-energize the circuit and lock out/tag out, then verify zero energy with a tested instrument before you work. Use insulated tools and PPE, maintain proper clearances, and, if needed, use noncontact testers or insulated barriers to check for voltage from a safe distance. Because you would be creating a current path through your body, this is not safe practice and should always be avoided.