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ELECTRICAL MACHINERY 



Disconnecting Sivitches. A high-voltage, a-c. air-break 

 switch is sometimes used but disastrous arcing will result 

 if the switch is opened when carrying much current. They 

 are used generally only as disconnecting switches; by means 



FIG. 266. A Small Manually-operated Oil Switch, Showing how it 

 is Mounted on the Switchboard. General Electric Co. 



of such switches a feeder may be disconnected from live 

 buses, but this should be done only when the feeder is 

 carrying no power. 



Remote-control Switches. A switch which is opened 

 directly by the operator is said to be a manually operated 



