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The National Electrical Code; An Analysis and Explanation of the Underwriters' Electrical Code, Intelligible to Non-Experts

The National Electrical Code; An Analysis and Explanation of the Underwriters' Electrical Code, Intelligible to Non-Experts


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. CENTRAL STATIONS FOR LIGHT AND POWER. PART II. Text Of Code Covered By This Chapter. 4. Switch Boards: ?Should be approved before being placed, a. Must be so placed as to reduce to a minimum the danger of communicating fire to adjacent combustible material. b. Must be accessible from all sides when the connections are on the back; or may be placed against a brick or stone wall when the wiring is entirely on the face, c. Must be kept free from moisture, ci. Must be made of non-combustible material, or of hardwood in skeleton form, filled to prevent absorption of moisture, e. Bus bars must be equipped in accordance with Rule 3 for placing conductors. 5. Resistance Boxes And Equalizers: ? a. Must be equipped with metal or non-combustible frames, b. Must be placed on the switch board, or, if not thereon, at a distance of a foot from combustible material, or separated therefrom by a non-inflammable, non-absorptive, insulating material. 6. Lightning Arresters: ?a. Must be attached to each side of every over-head circuit connected with the station. b. Must be mounted o'n non-combustible bases in plain sight on the switch board, or in an equally accessible place, away from combustible material, c. Must be connected with at least two earths by separate wires, not smaller than No. 6 B. and S, which must not be connected to any pipe within the building, rf. Must be so constructed as not to maintain an arc after the discharge has passed. Switch Boards.?Rule a covers in a general way the question of location, and common sense should enable any constructor to apply the rule in a particularcase. The front of a switch board usually carries a number of instruments, switches and safety devices, so that in most cases it is desirable to place our conductors upon the b...


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Product Details
  • ISBN-13: 9780217358293
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 0217358292
  • Publisher Date: 04 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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The National Electrical Code; An Analysis and Explanation of the Underwriters' Electrical Code, Intelligible to Non-Experts
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