I’m stumped on this one. It say in the code book. (For a service rated 100-400amperes, the service conductors supplying the entire the entire load associated with a one family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two family or multi family dwelling,shall be permitted to have an ampacity not less than 83 percent of the service rating.) I know I can take advantage of the 83% on a single family dwelling but I’m not understand for the multi family. Can the main service conductors coming to a meter stack of an apartment complex use the 83%rule and also the feeders going to the individual apartment unit?