"314.25 Covers and Canopies.
In completed installations, each box shall have a cover, faceplate, lampholder, or luminaire (fixture) canopy, except where the installation complies with 410.14(B).
410.14 Connection of Electric-Discharge Luminaires (Lighting Fixtures).
(B) Access to Boxes. Electric-discharge luminaires (lighting fixtures) surface mounted over concealed outlet, pull, or junction boxes shall be installed with suitable openings in back of the fixture to provide access to the boxes."
The way I read this is we have to cover the box with a cover, faceplate, lampholder or luminaire. A disconnect is not of these.
You may say, "well, it doesn't forbid using the disconnect..."
And I would reply, "it doesn't forbid using a sheet of cardboard either. Would you use cardboard?"
