A Reliance brand load-side transfer switch is installed with 18" of FMT (preinstalled with wires run through including an EGC) connected to main panel. The installation would seem to comply with NEC 250.118(5) as the circuits are 20A or less thereby not requiring separate bonding. However, the fitting to the main panel was installed into a 1" knockout that was reduced to 3/4" with reducing washers. Does that change the requirement? Thanks.