What are the common distribution system configurations?

Distribution configurations include: radial (single source, simplest, lowest cost, least reliable), loop/ring (multiple paths but operated open, improved reliability), primary network (multiple sources with automatic switching), and secondary network (common in urban areas, highest reliability, multiple transformers feeding grid). Selection depends on load density, reliability requirements, and cost. Underground urban systems often use networks; rural areas typically use radial. Automation enables faster restoration.