Which statement correctly describes the orientation of a pad-mounted single-phase transformer?

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The main idea is how a pad-mounted single-phase transformer is wired and accessed in the field: the high-voltage side (primary) is placed on the left, and the low-voltage side (secondary) is on the right when you face the unit from the street. This arrangement matches the typical routing of the distribution feeder into the transformer and the service connections leaving the transformer, which helps with safe disconnection, labeling, and maintenance. Having the primary on the left aligns with where the line fuses or switches are located, while the secondary terminals on the right provide straightforward access to the customer-side circuits. If the primary were on the right or if both windings were on the same side, it would mix up the line and load connections and complicate safe operation and servicing. So the described orientation—primary on the left, secondary on the right—is the standard, correct configuration.