Originally Posted By: jpeck
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Don't think you will find any.
That is because you are probably (based on your post) looking for the wrong thing.
The code will address the maximum weight allowed on a ceiling light fixture box and a ceiling fan box, but not the ceiling light fixture or ceiling fan itself.
This is because the ceiling light fixture or ceiling fan may be supported independently of the junction box it is mounted through.
One good example of this is the lift mounted lights, which can be lowered electrically to be cleaned or have lamps changed (such as one can find in large, multi-mil homes). These are supported from a motor driven winch device which can lower the fixture, then raise the fixture. The only limitation is the rating on the powered lift, and then you'd only need a higher rated lift for a heavier fixture.
Instead of addressing this in the code, this would be addressed with proper engineering of the trusses or structure supporting the heavy fixture or fan.