Library of Practical Electricity Volume 5

Library of Practical Electricity Volume 5

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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. 1917 edition. Excerpt: ...the wires from swinging together in the middle of a span. In inside wiring knob-andcleat work, the minimum separation between conductors is limited to the minimum spacing specified by the National Electrical Code. Where the conductors are in conduit they then lie so close together that the factor of inductive reactance with them is ordinarily negligible. The other way of reducing line reactance is to divide the copper into a greater number of circuits and to arrange these circuits so that there is no inductive interaction. Thus, in Fig. 101 the circuit of II will have less inductive reactance than the circuit of I, although it has the same total circular mils area, because it is subdivided. How and why subdivision See the author's Practical Electricity for a discussion of electromagnetic inductance and reactance. t See the author's Wiring For Light And Power. Fig. 101.--Showing how a conductor may be subdivided. decreases the reactance of a circuit will be evident from a consideration of some of the numerical examples which follow. Note.--Voltage drop in lines, due to inductive reactance, is best diminished by subdividing the copper or by bringing the conductors close together. It is little affected by changing the size of the conductor. 181. The Arrangement of Conductors in Polyphase Cir cuits f will next be given consideration. The directions for the calculation of polyphase circuit conductors which are given in following articles, hold only with certain arrangements of the circuit conductors. These arrangements are, however, the ones which ordinarily are, or which may be readily adopted. These conditions need not be considered where the circuit in question is short and, in general, they need not be considered in interior wiring circuits. more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236614275
  • 9781236614278