International Library of Technology · Scranton, International Textbook Co. · leaf 77
t the 50-volt secondary circuit is rapidlygoing out of use. A pressure of 50 volts was, at one time,•used quite largely for incandescent lamps operated fromtransformers, but has given place to 100 to 110 volts,because the latter requires less copper and it is now possibleto obtain 100- to 110-volt… … ■ 77. In many places, plants that were originally installedto operate at 1,000 volts primary pressure have been changedover to 2,000 volts,in order to allow alarger load to be car-ried without increas-ing the size of theline wires. In suchcases it has beencommon practice toconnect old 1,000-volt…
Electrical engineering
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