After lines have been declared hot, what should be done next?

• A. Read the lines for correct voltage
• B. De-energize the circuit
• C. Check insulation only
• D. Call supervisor

Answer: (B)

When lines are declared hot, they are energized and pose serious shock and arc-flash hazards. The immediate next step is to de-energize the circuit, bringing it to a non-energized state so work can be performed safely. This removes the energy source from the equation, which is essential before any testing, inspection, or repair. Reading voltage on live lines or focusing only on insulation while still energized keeps you at risk, and calling a supervisor isn’t the direct action needed to address the hazard—de-energizing is the critical first move. After de-energizing, standard practice is to lock out/tag out and verify zero energy before proceeding.