What is the difference between IC and non-IC recessed lighting fixtures?

IC fixtures can be directly buried in insulation and in direct contact with combustible building materials, such as wood joists & flooring members. Non-IC must maintain at least 3" from insulation on all sides, and none on top so as to entrap heat, with a minimum of 1/2" from combustible material (such as wood joists and flooring members). More.

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