We do electrical system design based on our knowledge of electrical enginering learned from univeristy, knowledge learned from the forum and others, and a lot of reference books such as NEC, Electrical Engineer's handbook, and Stallcup's Electrical Design book, etc. Those books do not mention a lot about primary service (high voltage, medium voltage) design, and I want to learn how to approach it. If you know any good reference book or menu about it, please let me know. Thanks.