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BELL SYSTEM TECHNICAL JOURNAL 



4, although that from the triple harmonics has been inappreciably 

 changed. The net efifect has been a reduction of nearly 75 per cent in 

 the noise on the party line stations served by the telephone cable. 

 The reductions afforded by various remedial measures are shown in 

 Table IV. 



It is evident from Table IV that, by the application of various of the 

 measures of coordination, the need for an extensive rearrangement of 

 either plant is avoided. 



Illustrative Example 2 



The purpose of this example is to show the extent to which 

 remedial measures of the type generally applicable in urban areas 

 (see Example 1), may be applied in a less thickly settled area 

 where exposures to 2.3/4 kv. multi-grounded neutral arrangements 

 are encountered under average conditions of power system wave 

 shape. In detail the example covers: 



a. The extent to which such measures as cooperative planning 

 of routes and use of wye-delta load banks may be in- 

 effective. 



TABLE V 



Noise at Various Locations (Fig. 5) and for Various Types 

 OF Telephone Service 



