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Thread: CPCV Supply And Lamp Heat

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    Jack of all trades, Master of none KULTULZ's Avatar
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    Post CPCV Supply And Lamp Heat

    Is there a practical guide or code that recommends/states how close CPCV can be placed to recessed lighting? This is in an overhead installation and the lamps will be IC.

    Again, thank you.

    Gary
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    Plumber jimbo's Avatar
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    Check with the pipe manufacturer, or the plastic pipe institute ( plasticpipe.org). I dont know the spec, but would be very leery of putting plastic near a lamp. Naturally, the pipe is rated for domestic hot water ( 140 max) and is OK for use in a hot attic, where the air temp may approach that number. But I would be very careful about what could be much greater heat from that lamp.

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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    CPVC has a maximum service temperature of 200F. The working pressure must be derated as temperature rises:

    http://www.harvel.com/piping-cpvc-derating.asp

    Its melting point is around 212C (Web searches will turn up numbers from 175F and up). I was surprised to see the variation and lack of definitive information.

    I'd lay a piece of pipe up against the can light for a while and see what happens.

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    Jack of all trades, Master of none KULTULZ's Avatar
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    Thanx Guys!

    This is a condo remodel with a fire rated ceiling and has two tiers. Water supply (1/2" CPCV) is routed through the ceiling(s).

    I have found a fire rated sheet metal box to put the lamp into (to preserve fire integrity). I thought that there may have been a code requirement or thumb of rule for proximity.
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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    I'd be sure to see exactly what they mean by "fire rated". Paper, for example, famously autoignites at 451F, above the melting point of CPVC; the box might get hot enough to melt the CPVC, but not start a fire.

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    Jack of all trades, Master of none KULTULZ's Avatar
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    Quote Originally Posted by Mikey View Post

    I'd be sure to see exactly what they mean by "fire rated". Paper, for example, famously autoignites at 451F, above the melting point of CPVC; the box might get hot enough to melt the CPVC, but not start a fire.
    That is what I am afraid of. The surround box guarantees no fire break through for one hour. What concerns me is the proximity of the light housing causing breakdown of the CPCV and subsequent flooding.

    Here is the enclosure(s)- http://www.ezbarrier.net/content/view/12/26/
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