I had planned on using Type SER cable for my apartment panel feeders in a multi-family project. The individual unit panels are fed from a meter lineup that contains a main disconnect before each apartment meter and feeder. I'm being told by the local township code official that I have to use MC cable for the feeders. I've looked but I don't see anything in the NEC which states I can't use SER. Does anyone know of any code restriction on SER for multi-family feeders. Thanks for your help.