Book excerpt: Developed as a handy, easy-to-use resource for electrical estimators, contractors, electricians, and apprentices, the Electrical Field Reference Handbook is the ultimate desk and field reference. Now updated to the National Electrical Code® 2008, it covers the most frequently used on-the-job information, such as: standard symbols for blueprints, drawings, and instrumentation, key formulas and calculations, common NEC® 2008 tables, motor and transformer calculations, and more. A section devoted to first aid and OSHA safety standards demonstrates the book's commitment not only to accuracy and currency, but also to safety. With a durable, spiral-bound format perfect for work in the field and a straightforward writing style, this book provides electricians with at-your-fingertips information virtually any time and any place it is needed.Check out our app, DEWALT® Mobile Pro(tm). This free app is a construction calculator with integrated reference materials and access to hundreds of additional calculations as add-ons. To learn more, visit dewalt.com/mobilepro.