A. Single-Phase: 2 or 3-Wire Service
A B N
H1
H2
X3
X1
Tank GND
X2
n a b
This is the most common distribution transformer connection used in North America. While the diagram above depicts a single-phase conventional transformer with two high voltage bushings, single bushing transformers in both conventional and CSP type are also common. Also in the above diagram, the high voltage side of the transformer is connected phase to neutral. Some utilities utilize transformers with high voltage ratings to connect between two high voltage phases rather than phase to neutral.
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