Ask This Old House master electrician Heath Eastman clarifies the temperature rating system for ceiling lights and then installs one for a homeowner

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Time: 23 hours
Cost: $200
Skill Level: Expert

Tools List for Replacing a Ceiling Light:
Screwdriver [https://amzn.to/2tKpFWn]
Pliers [https://amzn.to/2Guemod]

Shopping List:
TemperatureRated ceiling light [https://amzn.to/2TQwiRF]
NMB cable [https://amzn.to/2v9sxwf]
Junction box [https://amzn.to/2Rm99oI]
Wire nuts [https://amzn.to/2RF7464]

Steps:
1. Heath starts by explaining why ceiling fixtures are temperature rated and what that means:
a. Houses built before 1985 used wires that could withstand temperatures up to 60 degrees Celsius.
b. Certain lightbulbs generate more heat than 60 degrees, so over time, those wires could fray and crack, causing an arc, which could create a fire.
c. After 1985, they changed the code so that wires needed to be rated to withstand temperatures up to 90 degrees Celsius, which is common for most modern fixtures.
d. To determine which type of wiring you have, look at the cable.
i. Cloth wire is not rated for 90 degrees.
ii. Plastic wire with the words “Type NM” printed on them are rated up to 60 degrees.
iii. Plastic wire with the words “Type NMB” printed on them are rated up to 90 degrees.
2. Shut the power off at the breaker.
3. Remove the old light fixture using a screwdriver. The wiring will need to be disconnected before pulling it from the ceiling.
4. Push the old wiring out through the box and into the ceiling.
5. Cut a section of the old wiring away from the fixture.
6. Wire the new NMB cable to the old wiring inside of a junction box.
7. Fish the new cable through the electrical box and mount the electrical box to the ceiling.
8. Wire the new light to the new cable using a pair of pliers and wire nuts.
9. Mount the new light to the electrical box on the ceiling.
10. Turn the power back on.

Resources:
Heath installed the 12inch Oil Rubbed Bronze 2Light Ceiling Light, manufactured by Hinkley Lighting [https://amzn.to/2RmFoUH].

Expert assistance with this segment was provided by Eaton and Eastman Electric (http://www.eatonandeastmanelectric.com/).

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From the makers of This Old House, America’s first and most trusted home improvement show, Ask This Old House answers the steady stream of home improvement questions asked by viewers across the United States. Covering topics from landscaping to electrical to HVAC and plumbing to painting and more. Ask This Old House features the experts from This Old House, including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor. Ask This Old House helps you protect and preserve your greatest investment—your home.

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