Is it safe to disconnect the test leads before the voltage returns to zero?

• A. True
• B. Only after cooling
• C. Depends on equipment
• D. False

Answer: (D)

The safe approach is to avoid disconnecting live test leads at all while energy could still be present. Even if the voltage appears to be dropping, there can be stored energy in capacitors or inductors, and the moment you pull the leads apart the current can try to continue or surge, creating a spark that can shock you, damage the equipment, or ignite something nearby. The proper procedure is to de-energize the circuit, discharge any stored energy according to the device’s instructions, verify with a meter that the voltage is truly zero, and then carefully remove the leads. Waiting for the voltage to return to zero isn’t a reliable safety measure because energy can linger and arcing can occur during disconnection.