Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 191
M//77/nan7 Fig. 286.—Connection of an aluminum lightning arrester to a grounded neutral system from30,000 to 100,000 volts. The horn gaps are placed horizontally, not as shown. … ¥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
Electric wiring
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