A Textbook of Electric Lighting and Railways Volume 2

A Textbook of Electric Lighting and Railways Volume 2

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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. 1901 edition. Excerpt: ...middle wire and not between the outer wires. The system is easily unbalanced. Three wires are run to the motors. Twophase systems are generally installed as two separate twowire systems, four wires being run to the motors and the 76 Line FIG. 18. lights being divided equally on the two two-wire circuits. This gives better regulation (see Fig. 18). In this case, the current in each of the four wires will be one-half that which would flow if all the lamps were operated on a regular twowire system. 46. The monocyclic system is used only in transmission and in connection with motors. Wiring for lights on a monocyclic circuit is just the same as on any other two-wire circuit of the same voltage. The third wire is brought in only when a motor is installed. For its connections see Fig. 19. 47. Generally speaking, multiphase circuits are used in transmission of power only, and not to distribute current to individual lamps. For final distribution, two-wire circuits should be used, and either connected with the three or four multiphase lines at the distribution center or supplied with single-phase current by the use of suitable transformers. 48. House wiring should consist of two distinct portions: the distribution circuits, which run from the lamps to a center of distribution and which should always be twowire circuits, and the mains, which run from the outside lines to the distribution center and which must conform to the requirements of the particular system to be used. If mains must be installed before it is known what system is to supply current, it will be sufficient to run four separate wires of the size required if the lamps were to be divided equally between two separate two-wire systems. This will make it possible to connect to any system...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236982622
  • 9781236982629