. Pacific Gas and Electric magazine. was given to such an appliance. The old multi- the system, but finally it came when an inter-gap hghtning arrestor was considered, but re- connecting cable between Stations C andports concerning it were very discouraging and D broke down. This cable was hot fromthe electrolytic aluminum cell arrestor was new Station C but idle at Station the system. After considerable discussion The first indication of trouble was theone of the latter type was installed on the arrestor at Station C discharging, and on Porce/iBushjng Welded^Steef Tank 0,1- C
. Pacific Gas and Electric magazine. was given to such an appliance. The old multi- the system, but finally it came when an inter-gap hghtning arrestor was considered, but re- connecting cable between Stations C andports concerning it were very discouraging and D broke down. This cable was hot fromthe electrolytic aluminum cell arrestor was new Station C but idle at Station the system. After considerable discussion The first indication of trouble was theone of the latter type was installed on the arrestor at Station C discharging, and on Porce/iBushjng Welded^Steef Tank 0,1- Copper Connecfon. Fibre In&u/arion Tube. l/^oodenRod ^Support. 0,1. Elec/^ro/y/e^ Cones inCross-C>ect/on A/uminum Cones Comp/eJe- Centenng Contact Spring fletalBase Exploded view of lightning arrestor II ,000 volt busbars of Station C, on Jessie testing it was found that one leg of theStreet. It was of the indoor type, for over- I 1,000 volt system was grounded. No fur-head lines, with four stacks of twenty-eight ther trouble was noted, but an immediatecones each, for the underground neutral sys- search was started for the fault, by isolatingtern in use in San Francisco. For some time cables, one at a time, until the defective oneafter this arrestor had been put into service was eliminated. This operation was accom-there were no very serious disturbances on plished by taking over each cable successively, 404
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