Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 192
¥Groiync/ ^/(//77/hum Fig. 287.—Connection of alummum hghtning arresters to a delta or ungrounded system, from30,000 to 100,000 volts. The horn gaps are placed horizontally, not as shown. LIGHTNING ARRESTERS 181 … COPPER PLATE WITH GROUND LEAD BIVETEO TO IT ROUND LEAD PERMANENTLY DAMP EARTH FINE CHARCOAL Fig. 2SS.—Standard form of ground connection for lightning arresters. SECTION XVIMEASURING INSTRUMENTS MEASURING INSTRUMENTS 185
Electric wiring
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