This AutoCAD DWG file includes a complete Single Line Diagram (SLD) of a Distribution Board, showing circuit breakers, wiring connections, and load distribution for lighting, power, and mechanical systems. After reading and studying this handbook, electricians (or would-be electricians) will have a firm grasp on the many symbols used in electrical diagrams. In particular, you will understand how to read and interpret a wide variety of electrical diagrams and plans, and how to use them together for. The information provided in this document contains general descriptions, technical characteristics and/or recommendations related to products/solutions. This document is not intended as a substitute for a detailed study or operational and site-specific development or schematic plan. This course is an introduction to the information that is commonly found on electrical engineering drawings, the symbols used to represent the equipment, and the information and p ds for the design, installation, and use of. The legend is a list of the symbols to be used on SPU electrical design drawings (Figure B-1). The symbols are based on National Electrical Manufacturers Association (NEMA), Industrial Control Systems (ICS), and American National Standards Institute (ANSI) Standard Y32. A distribution board or distribution box is where the main power supply is distributed to multiple loads.