SWITCHING EQUIPMENT 



533 



buses, etc., and recourse was had to the methods of remote con- 

 trol. 



Commencing with the manually operated remote-controlled 

 switches equipped with rods and bell cranks, good practice finally 

 recognized the desirability of employing solenoid or motor- 

 operated breakers controlled from a central point. This arrange- 



Fio. 336. Rear View of Switchboard Shown in Fig. 335. 



ment permitted the location of the control board without reference 

 to the location of the breakers or the apparatus which they con- 

 trol. Absolute isolation of the high-tension equipment may thus 

 be secured, thereby largely eliminating the personal hazard and 

 danger of accidental contact and making possible the use of the 

 minimum amount of high-tension busses inside the station. 



