Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 220
Fig. 92 Fig. 93. Where a feeder loins the mains, a junction box is sunkin the ground, flush with the street level. The conductors ELECTRICAL ENGINEERING 217 and thin tubes enter this box from below. In a threewire system, there are three metallic rings provided in thejunction box, insulated from… … Fig. 94. strips, to the second all the negatives, and to the third allthe neutral wires. The box is kept watertight by a rubbergasket and by an iron cover bolted down. Bitumen is pouredover the bolts. In fig. 94, the letter A marks one of theslabs of insulating material for the pilot wires; B is a…
Electrical engineering
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