4th Year Lineman Apprentice Practice Exam

In a delta connection, the relationship between line currents and coil (or phase) currents involves the square root of three, which is approximately 1.732. When calculating the high side line current from the coil current in a delta system, the phase current is multiplied by this square root of three because, in a delta configuration, the line current is equal to the phase current multiplied by the square root of three.

To understand this relationship further, consider that in a delta configuration, each coil or phase is connected across the line. Therefore, the line currents add up vectorially, which leads to this factor of √3. This is vital knowledge in electrical systems where delta connections are common, providing the necessary understanding of how to compute the appropriate currents for both safety and efficiency in electrical installations.

Recognizing that the factor of 1.73 correctly accounts for the phases in a delta configuration supports calculations for current in three-phase systems, which is fundamental for line maintenance and safety in electrical work.