530 



ELECTRICAL EQUIPMENT 



black slate is best suited for switchboard work, as it is not easily 

 marred or stained and can readily be matched when making 

 extensions. 



The small wiring on the back of the panels should be done 

 neatly and regularly to facilitate tracing of connections, and it 

 should be arranged in a manner best suited for connection to the 

 control wires coming to the board. 



The back and ends of the board may be closed by a wire and 





^ 



FIG. 333. Arrangement of 2300-volt Switchboard with Switches Mounted 

 on the Pipe Work Supporting the Panels. 



grille-work screen to prevent tampering with the apparatus 

 back of the panels, while, on the other hand, they greatly enhance 

 the appearance of the installation. Switchboards provided with 

 these screens comply with the most stringent rulings of safety 

 first regulations since the screens afford complete protection 

 against accidental contact with live parts by operators and 

 others. 



Switchboards may be classified according to the style of con- 



