570 



ELECTRICAL EQUIPMENT 



FIG. 360. Bus Insulator; 

 Bus Laid Flat. 



FIG. 361. Bus Insulator; 

 Bus on Edge. 



361. The former is for 

 mounting the buses on edge 

 and the latter on the side or 

 flat. 



In stations of large capac- 

 ity precautions should be 

 taken in supporting the 

 buses in the compartments, 

 due to the great stresses 

 which are exerted under 

 short-circuit conditions. This 

 subject is dealt with in 

 detail in the section on 

 ' ' Current-limiting Reactors, ' ' 

 page 458. Fig. 362 shows 

 the design for a support to 

 be used under such condi- 

 tions. It consists of two 

 porcelain insulators, fitted 

 loosely into the horizontal 

 compartment barriers, as 

 shown. Two alloy clamps of 

 similar design, held apart by 

 four brass pillars fitting 

 loosely into holes in the 

 clamps, form the support for 

 the bars. The top clamp 

 has a threaded stud extend- 

 ing into a hollow in the top 

 insulator. By tightening the 

 nut on this stud against the 

 top insulator, the whole sup- 

 port is held firmly in place. 

 By loosening this nut to the 

 limit of its travel against the 

 top clamp, it is possible to 

 lift the top clamp for the re- 

 ception of new laminations 

 of bus or to remove the top 

 insulator, there being just 



