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Temperature-Sensitive Wiring

zongxujian 于2007-06-13发布 l 已有人浏览
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Q   When I was installing a light fixture recently, I noticed a warning that it should be attached to electrical wires rated for 90 degrees Celsius. An electrician told me that my wires are rated to only 60 degrees C. What does this mean and how can I safely use this light fixture?

A   Light manufacturers put that warning on many types of ceiling or wall-hugging light fixtures (see photo). That’s because these fixtures can trap enough heat inside the fixture to destroy the insulation on wires that aren’t rated for 90 degrees C. Once the insulation is gone, arcing can take place and the wiring becomes a very serious fire hazard. So, you have only two choices: Have the wiring replaced or choose a fixture that doesn’t require 90-degree wire.

To figure out whether you have 90-degree rated wire, look at the cable jacket or wire insulation. If you have nonmetallic wire (often referred to as Romex), you’re in good shape if it has the letters NM-B or UF-B printed on the casing. If your wiring is fed through conduit, look on the wire insulation for the letters THHN or THWN-2. The insulation of wire with a 90-degree rating is usually glossy, but you should rely on the printing to be sure. If these clues don’t help you, either call an electrician or choose another fixture.

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