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เนื้อหาย่อ : PREFACE TO THE SECOND EDITION This book has been rewritten to reflect the latest developments in the electrical field; covering new techniques and materials, and ncorporating the latest additions and changes in the Electrical Code. As in the first edition, this book uses the practical approach to the problems of Industrial and Commercial wiring. In conformance with the National Electrical Code, principles are brought out through the application of rules to specific installation projects. The project method of teaching, found so effective in the first edition, is again utilized with new examples planned for concise explanation of the projects. The beginning of this volume deals with methods and materials eculiar to the industrial and commercial feld. The subject ing, starting with basic lighting terms and principles, and discussing incandescent, fuorescent and mercury vapor lighting is covered along with the subject of lighting design as applied to both indus- trial and commercial applications. Principles learned in the first hapters are applied immediately to the design of various 1 and wiring installations. The subject of motors is given a thorough coverage. Beginning with various types and operating conditions, wiring, , overcurrent protection, controls and safety precautions are discussed making use of practical examples to demonstrate the code requirements and principles of installation. A new chapter is devoted to Commercial and Industrial calcula- tions which makes use of newly devised procedures which greatly simplify the necessary computations for an installation. Much of the ous figuring is eliminated, allowing quicker solutions t lems with greater accuracy.