I installed a 6-2G NM feeder to a 4 circuit nema 3r subpanel for 2 a/c's on a residence last week. The AHJ said I needed a 6-3g for the feeder to the 4 cir panel supply only 240v loads. I Told the AHJ is was straightr 240v with no provision for any 110v loads. (only 2-2pole spaces).Is there a feeder requirement I have missed that requires me to carry a neutral for this application. Comments please.