Hint: Give me a leg to stand on
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Wow! Where is all the support for this rooftop disconnect? Section 300.11(A) requires cabinets to be securely fastened in place. This cabinet seems to be floating in air or standing on one “leg.” Per Sec. 358.12(2), the EMT connected to the bottom of the cabinet is not permitted as a means of support. No rules in Art. 350 allow the liquidtight flexible metal conduit (LFMC) entering the back of the disconnect to be considered proper support for this disconnect either. Therefore, this cabinet has zero support.
The missing knockout seal at the bottom left of the disconnect is a violation of Sec. 110.12(A). Unused openings like this must be closed. Securing the LFMC to the gas piping supplying this roof top unit is not a good idea. I think many inspectors would agree doing this violates the intent of Sec. 350.30(A). This is speculation on my part, but it appears that the disconnect originally may have been secured to a rooftop HVAC unit that was bigger than the one that is presently sitting in that spot. Maybe the HVAC installer did the replacement without contacting a qualified electrician? However, now we can only guess this might be the case.