How to Safely Replace a Ceiling Light | Ask This Old House

A video on YouTube. In DIY & Home Repair, a Krater category.

Summary by Krater

A homeowner and a contractor replace an old ceiling light fixture and inspect the existing wiring to ensure it meets fire safety standards for older homes.

From the video

Answers: How to safely replace a ceiling light fixture

ceiling light replacement
electrical wiring inspection
junction box installation
wire temperature ratings

What it concludes

Light fixtures that take incandescent bulbs in older homes with lower temperature-rated wiring can cause insulation to become brittle and potentially arc or cause a fire.
Homes built before 1985 require supply wire rated for at least 90 degrees Celsius when installing modern light fixtures.
Wire with type NM-B designation is rated for 90 degrees C and is safe for newer fixture installations, whereas older type NM wire rated for 60 degrees C is not.

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