LIGHTING 



433 



voltage of the generator; (b) an ammeter, to measure the 

 amount of current ; (c) a voltmeter, to measure the pressure ; 



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After University of Minnesota 



Fig. 330. Knob and tube installation of electric wires in joists. Extra 

 protection where one ivire crosses another and an outlet take-off 

 through the plaster are provided. 



(d) a circuit-breaker, to disconnect automatically the bat- 

 tery or generator in case of overload or accidental reversal 

 of direction of flow of current; (e) a plug switch, to admit of 

 different connections to the voltmeter, that the voltage may 

 be measured at several places; (/) two main switches, to 

 connect the generator, battery, and lamp circuit in any 

 desired manner. (See Fig. 329 for wiring layout on the 

 switchboard.) 



5. Wiring. The 'switchboard wire should be made of No. 

 8 double-braided copper wire. Through the house or inside 

 of barns a No. 14, known as "new code" wire, should be used. 

 The installation of this wire should be made in accordance 

 with the underwriters' specifications as regards bushings, 

 protection, etc. Wires between the generator and distant 

 buildings should be No. 10 or No. 12 weather-proof. No. 

 12 is sufficiently large, but No. 10 is far more rugged and will 

 stand an accident, such as the falling of a tree, or a loaded 

 wagon passing under and dragging across the insulation, 

 with less liability to damage than will the lighter wire. 



The arrangement of lamps in the house, as well as in out- 

 buildings, should be given careful thought. A study of the 

 conditions will save many a desire, at least, to change the 

 location of a lamp after it has once been installed. Three 

 way switches will be found of very material value at one or 

 two places in the house and at several places in the barns. 



