Final answer:
Type Non-IC luminaires require a minimum of 3 inches of clearance from combustible materials to prevent overheating and fire risks, as per the National Electrical Code.
Step-by-step explanation:
Type Non-IC (non-insulation contact) luminaires must maintain a minimum clearance from combustible materials. According to the National Electrical Code (NEC), these types of fixtures typically require a minimum of 3 inches of spacing from any insulation or other combustible materials to prevent the risk of overheating and potential fire hazards. This spacing is essential for ensuring the safety and compliance of lighting installations in residential and commercial settings.