International Library of Technology · Scranton, International Textbook Co. · leaf 328
a ground may be located. K W Ground Q a Fig. 3? 30. The ground detectors just described apply moreparticularly to low-tension direct-current installations, butsimilar arrange-ments maybe usedon alternating-cur-rent systems byusing potentialtransformers. Fig.38 shows the meth-od used by theWesting… … Fig. 38. §17 ELECTRIC LIGHTING. 37 points 1 and 2 or 1 and 3 may be connected together. Underordinary conditions, the plug is in 1 and 2, thus connectingthe primary of the potential transformer across the line,and V serves as an ordinary voltmeter. 5 is a key, orpush button, that, when pressed,…
Electrical engineering
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