Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 187
Single Phase. 7^° Phase^ Independent. Two-PhaseConnec+ed. … Two-PhaseThree Wire. Three-PhaseDel+a Three-Phase V. Three-PhaseThree-Phase T S+ar Fig. 279.—Location of spark-gap dischargers for various arrangements of transformers.
Electric wiring
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