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ELECTRICAL EQUIPMENT 



In Fig. 380 is shown the diagram of connections for this scheme. 

 The negative bus is divided into two sections and two single-pole, 

 double-throw knife switches, A and B, are provided, one connected 

 to each section of the negative bus. When A is thrown down the 

 60 cells of battery are connected across the generator terminals, 



125 Volt Operating Bus. 



Motor-Generator Set 



Normal (Floating) : close 1 & 2 



Charge 60 Cells: 1 & 4. 



Charge 50 Cells: 3 & 1 



Motor Generator Set alone : " 2 



FIG. 380. Diagram of Connection for Floating Oil Circuit-breaker Battery. 



and when B is thrown down the two sections of bus are connected 

 together and current is furnished to the control circuit by the 

 dynamo with the battery floating in parallel. This is the normal 

 position of these switches. 



At the beginning of the charge, switch B is thrown up con- 

 necting the control circuit across 50 cells, and the voltage of the 



