What does the abbreviation CPC stand for in electrical installations?

• A. Circuit Protective Cable
• B. Circuit Protective Conductor
• C. Circuit Phase Conductor
• D. Circuit Potential Conductor

Answer: (B)

In electrical installations, a CPC is the protective conductor that provides a low-impedance path to earth for fault current. This keeps any exposed metal parts at or near earth potential and allows the overcurrent protective device (like a fuse or breaker) to trip quickly, reducing the chance of electric shock if insulation fails or a live wire touches metal.

The correct term is Circuit Protective Conductor because it specifically describes the conductor whose job is protection by fault return to earth. The other phrases don’t fit standard terminology: a protective cable would imply the whole cable assembly rather than the particular conductor; a phase conductor is the live (hot) conductor; a potential conductor isn’t the recognized term for the protective earth path.