Three single-phase pole-type transformers can be cluster-mounted to provide three-phase power.

• A. True
• B. False
• C. Partially true
• D. Not enough information

Answer: (A)

Three single-phase pole-type transformers can be mounted together to form a three-phase transformer bank that delivers three-phase power. Each unit provides one phase, and when the windings are connected in the appropriate delta or wye arrangement, the voltages come together to produce the three line voltages spaced 120 degrees apart. This cluster mounting is a common, practical way to obtain three-phase service from standard single-phase transformers on distribution lines. The exact three-phase output depends on how the secondaries are connected (delta or wye) and whether a neutral is provided, but the basic idea—three single-phase units arranged as a bank to supply three-phase power—is sound.