Which statement accurately describes the Hot-Cold-Hot procedure?

• A. It Involves Energizing the Circuit to Test Continuity
• B. It Requires Checking the Known Power Source, Deenergized Equipment, and Then Checking the Power Source Again
• C. It Is Used to Measure Insulation Resistance
• D. It Is Used to Test Continuity

Answer: (B)

Hot-Cold-Hot is a safety sequence used when performing a continuity check on electrical equipment. The idea is to verify the state of the circuit before and after a test so you don’t misinterpret readings or expose yourself to unexpected live voltage.

First, you check the known power source at the test point (hot) to confirm that the supply and the test setup are correct. Next, you de-energize the equipment (cold) so you can perform the continuity measurement safely on a non-live path. Finally, you re-check or re-verify the power source (hot) to confirm the circuit state before you restore power or continue work.

This is why the option describing checking the known power source, deenergizing, and then checking the power source again is the best fit. It captures the essential sequence and safety intent of the procedure.

The other statements don’t fit because one focuses only on energizing to test continuity, which bypasses the crucial safety/de-energizing step; insulation resistance testing refers to a different test method; and simply saying it’s used to test continuity omits the necessary power-state verification steps.