Icru Report Volume 3

Icru Report Volume 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...Insulators, and Tie Wires.--Insulator pins shall be of steel, wrought iron, malleable cast iron, or locust or equivalent wood. Steel or iron pins shall have diameter of shank not less than one-half inch. Wood pins shall be sound and straight grained with a diameter of shank not less than 1% inches. Insulator pins shall have strength sufficient to withstand the loads to which they may be subjected. Each insulator shall be of such pattern, design, and material that when mounted it will withstand, without injury and without being pulled off the pin, the ultimate strength of the conductor attached to the insulator. The conductors shall be securely tied to each supporting insulator. (d) Conductors.--Conductors shall be of hard-drawn copper, copper-covered steel, galvanized steel, or other hard-drawn corrosion-resisting metal, provided, however, that galvanized steel shall not be used in localities where excessive corrosion would result. If spans in excess of 150 feet are necessary, the size of conductors specified or the sags shall be correspondingly increased. (See rule 282 a.) Conductors of material other than the above shall be of such size and so erected as to have a mechanical strength not less than that of the sizes of copper conductors given below. Twisted-pair wires without a supporting messenger shall in no case be used for grade D in spans longer than 1oo feet, nor for grade E in spans longer than 125 feet, and shall be eliminated as far as practicable. Each wire of a twisted pair not supported by a messenger shall be tinned hard-drawn copper not smaller than No. 14, or tinned copper-covered steel not smaller than No. 17. The minimum allowable sizes for conductors of the crossing span shall be as follows: TABLE 11.--Minimum Wire...
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Product details

  • Paperback | 98 pages
  • 189 x 246 x 5mm | 191g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236573501
  • 9781236573506