After all is said and done, the listings and code call for the use of "approved fittings" be used for termination. Most if not all AC fittings are not approved for terminating MC cable. MC fittings have a guide built in that hold the wire centered, away from the edge. AC connectors do not. The biggest problems I have seen analyzing failed industrial equipment have been 1)cutting MC or AC with improper tools; 2) using AC connectors with MC cable and no bushings; 3)failing to properly torque the termination fitting so that the cable pulls out. The next time you go to the supply house to get MC fitting, especially 90s, look and see exactly what you get. You might be surprized.
