Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 612
sed for protection against lightning,and against all currents such as might produce potentials of 300volts or over between the line and ground. With a distance of .005of an inch between the carbon blocks a pressure of 300 volts acrossthe blocks will break down the insulation of the air gap… … FIG. 422.—CARBON BLOCK ARRESTER. other protection is necessary. However, a high potential current dueto a cross with a. high tension wire is hkely: to persist after beinggrounded, and thus cause a very large current to flow over the con-ductor so grounded, which may be injurious to the line wire or…
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