Radial system is the most common type of distribution system in developing countries of the world with inherent losses along the line. Aggregate Technical, Commercial and Collection (ATC & C) Losses as an index to indicate losses in the power system is trendy as it provides clear picture of both energy and revenue loss conditions. This paper presents a pragmatic feeder-wise methodology for establishing Aggregate Technical, Commercial and Collection (ATC & C) losses in a typical Nigerian distribution system. The case chosen for this study is an area covered by Life Camp Area Office of Abuja Electricity Distribution Company (AEDC) of Nigeria. The analysis was achieved through extensive field survey and critical study of the schematic diagram of the network area. This study, of course, serves as a working tool to seasoned fieldworkers and utilities when appraising distribution system losses.