534 



ELECTRICAL EQUIPMENT 



It is difficult to give any accurate recommendation as to where 

 the dividing line should be between the different arrangements. 

 In general, it may, however, be said that those shown in Figs. 333 

 and 334 can be used for voltages up to 6600 and station capacities 

 not exceeding 5000 kilowatts. For higher capacities and voltages 

 it is advisable to mount the oil circuit breakers in compartments. 

 In fact, most high capacity switches for moderate voltages are 



FIG. 337. Typical Vertical Type Switchboard with Electrically Operated 

 Remote-control Oil Circuit Breakers. 



made for cell mounting, but above 22,000 volts they are, as a 

 rule, of the open design. 



Figs. 335 and 336 show the front and rear views of a typical 

 switchboard of the vertical panel type with hand-operated oil 

 circuit breakers mounted at the rear of the panels. Fig. 337 

 shows a similar board for electrically remote control circuit 

 breakers. 



It is often found in a large and complex installation that if all 

 the instruments and apparatus were located on a vertical switch- 

 board, its dimensions would be too great for convenient opera- 

 tion, and many appliances such as control switches, synchronizing 



