Recessed incandescent luminaires must have thermal protection and must be marked.

• A. It is not required
• B. True
• C. False
• D. Only in some buildings

Answer: (B)

Recessed incandescent luminaires present a risk of overheating inside an enclosed ceiling space, so they need safeguards to prevent fires. Thermal protection means the fixture has a built‑in mechanism that automatically interrupts power if the temperature gets too high, helping to prevent overheating. The marking requirement ensures installers and inspectors can quickly verify the fixture’s capabilities and installation limits, such as whether it is rated for insulation contact or must be kept clear of insulation. Together, these provisions promote safe operation and proper installation, which is why the statement is true.