For a starter that requires a two-leg configuration, which of the following is correct?

A two-leg configuration in a starter system typically refers to a configuration that uses two phases or legs of power. In this context, the closed transition starter is designed to provide a smooth transfer of the motor from one power source to another without any interruption in power. This feature is especially beneficial in applications where maintaining the motor's operation without momentary loss of power is critical.

Closed transition starters achieve this by momentarily connecting both the old and new power sources during the transition. This minimizes the mechanical and electrical stress on the motor, helping to ensure smooth operation and greater longevity of the equipment. This capability aligns well with systems that operate under a two-leg configuration, where maintaining continuous power and reducing torque fluctuations is essential for efficient motor control.

In contrast, other choices like prime resistor starters, open transition starters, and single-phase starters do not inherently provide the same smooth transition or are limited in their capability to operate within a two-leg configuration essential for certain applications.