Hint: A bird’s eye view of poor rooftop wiring.
None of the rigid PVC conduit runs here have expansion fittings installed in them. They are most likely required here to compensate for thermal expansion and contraction as specified in Sec. 352.44. Being in direct sunlight can have an even greater effect on the thermal expansion and contraction of the PVC conduit. Typically, PVC conduit expansion fittings include instructions that may require adding 30° to ambient air temperature changes for installations in direct sunlight. Even for relatively short runs this can result in lengths changes greater than 1/4 in.
Another noticeable problem with this installation is the MC cable installed from box to box. This type of MC cable is not the type specified in Sec. 330.10(A)(11) for this wet location. The metal box with 2 MC cables connected to it is not secured to anything and is just sitting upside down on the rooftop without being secured as specified in Sec. 314.23. Lastly, it appears as though some splices were made in the MC cable near the floodlight without being installed in a box or other enclosure as required by Sec. 300.15. Instead, the installer merely wrapped them in green tape.
