Ceiling box in return air Plenum

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bkelly

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An apartment with an enclosed return air plenum above a sheetrock ceiling in the hall. Any requirements for electrical other than being encased in conduit. They have installed a 3/0 box on a hanger for a ceiling light, and the box is located in the return air plenum.
 
An apartment with an enclosed return air plenum above a sheetrock ceiling in the hall. Any requirements for electrical other than being encased in conduit. They have installed a 3/0 box on a hanger for a ceiling light, and the box is located in the return air plenum.
300.22 give that a try
 
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