What is the standard polarity of a 14.4 transformer that is less than 200 kVA?

The standard polarity for a 14.4 kV transformer that is rated under 200 kVA is indeed subtractive. This means that when connecting the primary and secondary winding, if one end of the primary coil is marked as positive, the corresponding end of the secondary coil that is connected to the circuit will be negative.

Understanding the significance of subtractive polarity is crucial for linemen, as it helps ensure proper phasing and prevents issues such as short circuits or equipment malfunction when connecting transformers in a distribution system. In several applications, subtractive polarity is used to maintain the correct phase relationship between the primary and secondary windings, which is vital for the safe and efficient operation of electrical systems.

The other choices do not apply to this specific context of transformer polarity under these parameters. Additive refers to a system where voltages in series add together, neutral does not pertain to transformer winding polarity, and reversible indicates the ability to switch primary and secondary connections, which is not a standard polarity designation.