. Electric railway journal . Fig. 5—Southern Pacific 1200-Volt Lines—Two-Track In-termediate Bridge strand hard-draw n copper. The insulators are of threepieces, of the construction and dimensions shown in Fig. malleable iron galvanized pin for these insulators isshown in Fig. 8. The insulators are made of porcelaincoated with a dark brown glaze. The specifications re-quired that each part of every insulator should withstand atest of 30,000 volts and the complete insulator a test of80,000 volts alternating current applied for one minutecontinuously. The electrical test was made by inver
. Electric railway journal . Fig. 5—Southern Pacific 1200-Volt Lines—Two-Track In-termediate Bridge strand hard-draw n copper. The insulators are of threepieces, of the construction and dimensions shown in Fig. malleable iron galvanized pin for these insulators isshown in Fig. 8. The insulators are made of porcelaincoated with a dark brown glaze. The specifications re-quired that each part of every insulator should withstand atest of 30,000 volts and the complete insulator a test of80,000 volts alternating current applied for one minutecontinuously. The electrical test was made by invertingthe insulator in a shallow pan of water and pouring waterinto the pan, so that the two bodies of water were made toserve as electrodes. One out of every fifty assembled in-sulators was subjected to a mechanical test of 4000 lb. \< — Fig. 6—Southern Pacific 1200-Volt Lines—Messenger Cableand High-Tension Insulators applied horizontally to the tie wire groove. The insulatorsso tested were then broken to inspect the texture of theporcelain. The high-tension strain insulators are of the link typeand are made of one piece of dark brown glazed of this insulator when assembled with the wiresthreaded through the wire holes were required to with-stand a mechanical test equivalent to a pull of 6000 lb. be-tween the wires. The electrical test required these in- sulators to withstand 80,000 volts for one minute continu-ously applied between the wires. When subjected to a pre-cipitation of Ya, in. of clear water per minute on any sur-face the insulators were required not to break down or arcover at less than 50,000 volts applied between the wires. In the underground sections there is used No. 0000 three-conductor varnished cambric lead-covered cable insulatedwith 7/32 in. of cambric
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