Which term describes wiring that maintains circuit operation during a fire event, typically rated to two hours?

• A. Class II wiring
• B. Thermoplastic wiring
• C. Circuit Integrity Cable
• D. Ground fault circuit

Answer: (C)

The key idea is identifying wiring that is built to stay functional under fire conditions, preserving the power and signaling needed for life-safety systems for a set period. Circuit Integrity Cable is the term used for cables engineered to maintain circuit operation during a fire, typically rated to two hours. This means the insulation and sheath can withstand high temperatures and resist degradation long enough to keep critical systems—like fire alarms, emergency lighting, and other life-safety circuits—operational as the fire progresses. The other options don’t serve that purpose: Class II wiring is a category for limited-energy circuits and isn’t about enduring fire exposure; thermoplastic wiring is prone to melting and burning and won’t maintain function in a fire; a ground fault circuit is about preventing shock by interrupting power on fault and has no inherent fire-resistance rating for continuing operation during a fire.