Fluorescent fixtures mounted on low-density cellulose fiberboard must generally be mounted the fiberboard surface?

Answer:

The 2008 National Electrical Code (NFPA 70) Article 410.136 (B) requires surface mounted luminaires containing a ballast to be listed for mounting on the fiberboard or they must be mounted not less that 1 1/2 inches from the surface of the fiberboard.

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