314.27

[PCN]

We have a sitiuation where we mount an exterior 8' fluorescent fixture under a canopy. The fixture has a two 12" mounting arms that are designed to attach to a 4 0 box.
It is very ulgy to try to flush mount the box to the underside roof decking(which would be ideal).

I've seen this done with a two gang weatherproof box surface mounted which looks clean. My question is aren't most square weatherproof boxes only rated for a device and not fixture support?

Is there one on the market rated for fixture support? A round box would not look good in this application.

 

[Twoskinsoneman]

This is from the UL if it helps. I personally have never seen a two gang weather proof box listing for the support of fixtures.

FIXTURE SUPPORT
A box, with or without a bracket or bar hanger, intended for support of a
fixture weighing 50 lbs or less is marked ??FOR FIXTURE SUPPORT?? on the
carton to indicate that the box is intended for fixture support. A box, with
or without a bracket or bar hanger, intended for support of a fixture
weighing more than 50 lbs is marked with the weight of the fixture to be supported.​

Metallic device boxes and device plaster rings have not been investigated for
support of a ceiling fixture unless marked for use in ceilings, walls, and
with the weight of the product to be supported.​

Metallic device boxes or metallic device boxes intended to be installed in an existing
structure have been investigated for the support of fixtures, smoke detectors and
carbon monoxide detectors weighing not more than 6 lbs.​