Low-voltage shore connection power systems

This paper reviews low-voltage shore connection power systems for ships with up to 1,500kVA and voltage of 400V to 690V. The design for these systems is contained in the current low-voltage shore connection (LVSC) draft standard IEC/IEEE80005-3. This paper attempts to clarify that a LVSC design that uses multiple parallel feeder circuit breakers is not violating National Electric Code (NEC) National Fire Protection Association (NFPA) 70 Section 240.8. This paper also attempts to clarify the optional design for an ungrounded shore-power system, where required, which is included in the draft standard. In addition, this paper reviews the safety loop circuit to enhance the safety of the operators both onshore and onboard a ship.