Im still not sure that a weatherhead is a "fitting" This is from the UL white book:
Conduit fittings (DWTT)
This category covers metallic and nonmetallic conduit fittings, such as connectors, couplings, conduit bodies, short-radius conduit bodies, expansion fittings, locknuts and sealing (liquid-tight) locknuts for use in the assembly of nonmetallic and metallic wiring systems. Also covered are fittings used to provide a transition between metallic and nonmetallic wiring systems. All fittings are intended to be installed in accordance with ANSI/NFPA 70, ‘‘National Electrical Code’’ (NEC), and are intended for installation and use in accordance with the following information and the limitations specified in the appropriate conduit or tubing category. Some of these fittings are also suitable for use in certain hazardous (classified) locations where unclassified locations fittings are permitted in Articles 501, 502, 503, 505 and 506 of the NEC. This category also includes metal bushings for use in conduit and insulating bushings for use on conduit inside boxes, gutters, etc. The individual certifications for each connector used with nonmetallic sheathed cable may have details about the size and number of the nonmetallic-sheathed cable it will secure. All male threaded fittings and nipples have only been investigated for use with locknuts. Fittings with internal female threads (e.g., hubs, conduit bodies, couplings) have only been investigated for use with threaded rigid conduit.
