Hint: Questionable box support
I’m not so sure the boxes installed here are properly supported in accordance with the requirements Sec. 314.23(F) Exception No. 2. Specifically, Condition 2 is where the problem seems to be. One unbroken length of IMC or RMC is permitted to support a box for a luminaire where six conditions are met. Condition 1 limits the conduit length to 3 ft beyond the last conduit support. There is no problem with the conduit length here. Condition 2 requires an unbroken length of conduit before the last conduit support to be 12 in. or greater in length, and that portion of conduit must be securely fastened no less than 12 in. from its last point of support. Condition 2 seems problematic for this installation. Condition 3 requires the luminaire to be at least 8 ft above the public sidewalk below. Not a problem here. The luminaires don’t exceed 12 in. as specified in Condition 4. The weight of these luminaires certainly complies with the 20-lb limit of Condition 5. The luminaires appear to be securely threaded into the box as required by Condition 6. All in all, it is a pretty good installation other than questionable compliance with Condition 2.
