I have a knockout in an outdoor electrical panel that is above the uninsulated portion of the panel. I need to run 4/0 SER wire into the panel. According to NEC 312.2, I need a wet listed fitting when working above the uninsulated portion of the panel. However, I can only find weatherproof fittings for SE/SEU, but not SER.

Several web sites seem to recommend using standard dry-location clamps plus duct seal or caulk, but that doesn't seem to meet the requirements of 312.2.

What is the proper way of terminating SER at this location?

312.2 Damp and Wet Locations. In damp or wet locations, surface-type enclosures within the scope of this article shall be placed or equipped so as to prevent moisture or water from entering and accumulating within the cabinet or cutout box, and shall be mounted so there is at least 6-mm (1/4-in.) airspace between the enclosure and the wall or other supporting surface. Enclosures installed in wet locations shall be weatherproof. For enclosures in wet locations, raceways or cables entering above the level of uninsulated live parts shall use fittings listed for wet locations.

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