Before making a continuity check, what must be done to the circuit?

Before making a continuity check, what must be done to the circuit?

• A. The power must be turned off
• B. The circuit must be energized to check continuity
• C. The circuit must be grounded
• D. The circuit must be isolated with a switch

Answer: (A)

Continuity checks test whether a conductive path exists, so you must remove all energy from the circuit to get a valid, safe reading. Turning the power off eliminates voltage and current, preventing shocks and damage to the meter while ensuring you’re measuring the resistance of the path itself rather than a live circuit. Grounding isn’t required for this test and could affect readings, and while isolating the circuit helps with safety, the key step is de-energizing the circuit before testing.

Continuity checks test whether a conductive path exists, so you must remove all energy from the circuit to get a valid, safe reading. Turning the power off eliminates voltage and current, preventing shocks and damage to the meter while ensuring you’re measuring the resistance of the path itself rather than a live circuit. Grounding isn’t required for this test and could affect readings, and while isolating the circuit helps with safety, the key step is de-energizing the circuit before testing.