Which tool is commonly used to verify continuity of a control circuit before energizing?

• A. Insulation resistance tester
• B. Digital multimeter
• C. Pull test gauge
• D. Soldering iron

Answer: (B)

Verifying continuity before energizing a control circuit means confirming there is a complete electrical path from one point to another. A digital multimeter is the tool for this because it can measure resistance or provide a continuity beep between two conductors. If the circuit is intact, the meter shows a low resistance or beeps, indicating a continuous path. If not, it shows high resistance or no beep, signaling an open or broken connection that could cause a fault once power is applied. This helps catch broken wires, loose terminations, or miswirings before energizing.

The insulation resistance tester checks leakage through insulation, not the actual control-path continuity; a pull test gauge tests mechanical strength, and a soldering iron is used for joining wires, not testing continuity.