What is a safe practice before testing any electrical circuit?

• A. Power off, de-energize, and verify lack of voltage with a tester.
• B. Leave power on and test with the meter.
• C. Only turn off the device after starting the test.
• D. Ground yourself and proceed.

Answer: (A)

Powering down and confirming zero energy before testing is essential for safety. Start by turning off the circuit and isolating all energy sources, then use a voltage tester to verify there is no voltage present at the points you will touch. This check protects you from electric shock and arc flash and also guards against stored energy in capacitors or other components that can release energy suddenly. Skipping this step or testing while power is on creates a serious risk to you and to nearby equipment. Grounding yourself can help with static safety in some situations, but it doesn’t make a live circuit safe to touch. The safest approach is to power off, de-energize, and verify lack of voltage with a tester.