I am shopping for a new service panel. Some panels indicate they are sized in two numbers 16/32 for example. I assume this means up to 16 double pole breakers or 32 single pole breakers. Some just have one number say 26 branches or 26 poles. I am trying to understand the significance of the difference when only one number is used. Do the single number models only take single pole breakers ? Is a 26 branch circuit box the same as a 13/26 ? Any help appreciated.