Congressional Edition Volume N . 2949

Congressional Edition Volume N . 2949

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...of from 18 to 20 amperes. Cable must be delivered at a point to be designated, within thirty days from acceptance of bid. Bidder shall furnish a suitable guaranty that the insulation of the cables furnished shall not materially deteriorate for the space of two years after being in service on an electric-light circuit, having a voltage of from 2,500 to 3,000 volte and a current of from 9 to 12 amperes, or a voltage of from 900 to 1,200 volte and a current of from 18 to 20 amperes. Cables must be of such diameter over all that not less than two cables can be drawn into a duct measuring 2 inches in the clear, inside measurement, in diameter. FUBTHER DETAILS. Headquarters Fire Department, City Telegraph, Chicago, March IS, 1891. Gentlemen: I have been unavoidably delayed in answering your favor of the hh ultimo, as this is my busy season of the year for municipal matters. With reference to your queries, I will answer them seriatim: (1) What has been your experience with underground systems? My experience with underground systems dates from 1878. (2) What is the degree of proximity in your conduits between telephone, telegraph, and electric-light wires? In the conduits belonging to the city we have telephone, telegraph, and electric-light wires running parallel in separate ducts. The conductors of the different systems are from an inch to a foot apart. (3) What, if any, trouble does such proximity delevop? The only trouble developed by such proximity is from induction, and that only (materially) affects the telephone lines. (4) Can it be successfully remedied; and, if so, how? It can be sucessfully remedied by running the outgoing and incoming wires, or positive and negative sides of the electric-light circuits, in the same ducts ana using...show more

Product details

  • Paperback | 316 pages
  • 189 x 246 x 17mm | 567g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236535588
  • 9781236535580