[Electric engineering.] . Although the combinations on these boards are not so easyto follow out from a diagram, the manipulation of even alarge board is something that is soon learned when one hasthe board actually before him. The two things that aremost important to bear in mind are always short-circuit adynamo or circuit before cutting it out, and never open acircuit when the current is on. 63. Brusli Plug and Spring- Jack.—As stated above,in some of the boards used with large multicircuit machines,the ordinary cable method of connection is used. Anotherfeature of modern arc boards is that
[Electric engineering.] . Although the combinations on these boards are not so easyto follow out from a diagram, the manipulation of even alarge board is something that is soon learned when one hasthe board actually before him. The two things that aremost important to bear in mind are always short-circuit adynamo or circuit before cutting it out, and never open acircuit when the current is on. 63. Brusli Plug and Spring- Jack.—As stated above,in some of the boards used with large multicircuit machines,the ordinary cable method of connection is used. Anotherfeature of modern arc boards is that no live metal parts areallowed on the surface where they might happen to be 54 ELECTRIC LIGHTING. § 19 touched by the attendant. These precautions are espe-cially necessary for boards that are used with large arcmachines, some of which generate 10,000 or 11,000 volts. Fig. 33 illustrates the style of plug used on Brush arcboards. It will be noticed that pains are taken to securehigh insulation. A is the marble panel an
Size: 1472px × 1698px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
