lens arc tube containment

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shputnik

shputnik

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Utah
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Expert wirenut installer
How can u tell if a fixture has a listed glass lens or plastic lens rated for arc tube containment? Is it safe to assume if it has a lense it is OK?
 
don_resqcapt19

don_resqcapt19

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Illinois
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retired electrician
John120/240 said:
What do the fixture instructions say ? If the lens is original to the fixture one would assume that it was listed for the application.
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The requirement for a containment is fairly new. Older fixtures may not be able to contain a explosive failure of the MH lamp, even if they have a lens. There are newer lamps that have a built in containment, and they have a longer threaded base and the fixture has a matching socket to prevent the use of a lamp without built in arc tube containment.

As far as I know this only applies to Metal Halide lamps and not other types of high intensity lamps.
 
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