Mining American Volume 62

Mining American Volume 62

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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. 1910 edition. Excerpt: ... or manways should be highly insulated and substantially fixed in position. Shaft cables whose parts cannot sustain their own weight should be supported by grips, not to exceed 23 ft. apart, which will not cause abrasion of covering and shall not carry more than the weight of cable between two successive grips. For unboxed cables space between them and side of shaft should be left, that they may yield to impact of falling material. Cables in Haulage Roads.--Where cables or feed wires in main haulage roads cannot be kept at least 12 in. from any part of the mine car or locomotive, they should be specially protected by proper guards. Cables and wires, unprovided with metallic coverings, should not be fixed to walls or timbers with uninsulated fastenings. Protection should be given to cables during blasting, or when roads are under repair. Trailing cables for portable machines should be specially flexible, heavily insulated and protected with extra stout braiding, hose pipes or the like; and each cable should be difference of potential between rails and pipes, and to prevent electrolysis of the pipes. The rail return should be of sufficient capacity for current used, independently of the pipes. On main haulage roads, both rails should be bonded and cross bonds placed at not to exceed 200 ft. apart. Lighting Circuits.--For wires of incandescent lamps connected to trolley circuit the lug of trolley hanger, to which connection is made, should be drilled to receive same and wire secured by set screw. Lighting wires should not be wrapped or tied about stems or studs of trolley hangers. Ground connection in such cases should be to track circuit. Insulation for all lighting circuits should be adequate for the voltage, with wires hung on porcelain...
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Product details

  • Paperback
  • 189 x 246 x 34mm | 1,157g
  • United States
  • English
  • black & white illustrations
  • 1236737733
  • 9781236737731