Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the transformers providing power to the refrigerated container feeder bus? EL-0014

Correct Answer: Option D — Prevent any unintentional grounds in the refrigerated container distribution system from affecting the main distribution system.

Isolation transformers feeding refrigerated container buses prevent any unintentional ground faults on the isolated reefer distribution network from propagating into the ship's main electrical distribution system, thereby maintaining system reliability, protecting sensitive containment equipment, and complying with IEEE 45 ground isolation principles.