[Electric engineering.] . at are drawn into theducts after the conduit proper has been completed. Thesecables are drawn from manhole to manhole by means of arope attached to the end of the cable. Fig. 20 shows onearrangement for drawing in cables. 23. Cables.—The construction of the cables themselvesdepends on the kind of service to which they are to be kinds of insulation are available—rubber and good rubber insulation, a small puncture in the leadsheath may not impair the insulation for some time, becausethe rubber is, to a large extent, proof against the other
[Electric engineering.] . at are drawn into theducts after the conduit proper has been completed. Thesecables are drawn from manhole to manhole by means of arope attached to the end of the cable. Fig. 20 shows onearrangement for drawing in cables. 23. Cables.—The construction of the cables themselvesdepends on the kind of service to which they are to be kinds of insulation are available—rubber and good rubber insulation, a small puncture in the leadsheath may not impair the insulation for some time, becausethe rubber is, to a large extent, proof against the other hand, paper insulation will be damaged if the §15 ELECTRIC TRANSMISSION. 17 lead sheath becomes punctured so as to admit insulation is, however, cheaper than rubber, and ifthe cables are carefully installed will give excellent 21 shows a paper-insulated cable designed for 6,600-volt, three-phase transmission. The three conductors areinsulated with paper wrapping to a thickness of £ :tfS
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