Identifier: streetrailwayrev15amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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iis core. Ilic working voltage forthis type of cable is 13,200 volts clilTerence of potential across thephases of the 3-phasc alternating current circuits. Before suchcable is installed for service it is subjected to a test of 26,000 voltsdifference of potential. As any cable is of sufficient conductivity to operate the sub-stationwhich it serves, but one of the two cables serving any sub-stationis in use at any otic time. Kach cable is put into service every otherday and is out of service on alternate days; this arrangement pro-tects one cable to each sub-station from any excessive voltage surgesthai may occur on the system and insures the availability of a sec-ond cable in case the cable in use should break down from anycause. The alternating current cable ducts arc carried to the inside ofthe sub-station and power house walls. The cables emerging fromthe ducts terminate in cast bronze bells which are supported \n thepower stations and sub-stations immediately under the oil switches
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EMERGENCY ST.MIUN, I3TH .\ND MT. VERNON STS. In the underground dislrilnition s.\stcni there arc over i.ooo milesof cable in use for distributing current used in the railway opera-tion. This cable is laid in vitrified clay ducts wdiich have beenadapted as standard for all underground work. These are built insingle-duct formation and are surrounded by a protecting wall andbed of cement concrete 3 in. tliick. The standard manholes are9 ft. long and vary in width and depth to suit local conditions of thestreet and the number and location of the conduits. Terra cottadrain pipes connect these manholes with the city sewerage system.The entire system of manholes is inspected and cleaned periodically.It is a rule of the company that a thorough cleaning shall be giveneach manhole once every two months. Each rotary converter sub-station is connected with the gen-crating plant by two or more high potential cables, which are of thethree conductor type and vary in size from No. o to No. 0000. Thei

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