532 ELECTRICAL EQUIPMENT 



panel type Fig. 334, but the oil switches and bus-bars are 

 mounted on a pipe or other structure somewhat to the rear of 

 the panels, the switches being operated by handles, located on 

 the front of the panels, through the medium of mechanical con- 

 necting rods. 



The electrically remote-control switchboard may be either of 

 the vertical panel type or of the bench-board type, depending on 



FIG. 335. Typical Vertical-type Switchboard with Hand-operated Oil Cir- 

 cuit Breakers. Front View. 



the conditions to be met. The oil circuit breakers and the bus- 

 bars are installed in the most convenient place in the station, often 

 at a considerable distance from the board The breakers are 

 then operated by means of solenoids or motors, which in turn are 

 controlled from the switchboard. 



The proper type of switchboard to be selected depends on the 

 apparatus involved, particularly the oil circuit breakers and the 

 bus-bars, and these in turn on the power to be handled, the voltage, 

 operating features, space available, etc. 



With stations of large capacity and high transmission poten- 

 tials, requiring a heavy switching equipment, manual control is 

 practically impossible, partly from mechanical reasons and partly 

 on account of the increased space factor required by the breakers, 



