This recommended practice is based on current electrical engineering methods and practices for applying 1 kV to 35 kV MVDC power distribution and DC power delivery systems on ships. Recommendations are made for analytical methods, preferred interconnection interfaces and performance characteristics for reliable integration of MVDC electrical components into the ship electrical power systems. The purpose of this document is to recommend a methodology for analysis and specifications parameters for 1 kV to 35 kV MVDC power systems on ships. It will describe impact of MVDC on all electrical components and will formulate requirements on proper interfaces, sizing, life cycle cost, weight, efficiency and risk reduction of MVDC power systems implementation. It will compliment the IEEE Std 45-2002. New IEEE Standard - Superseded. Guidelines to specify, procure, design, manufacture and develop manuals, safety procedures, practices and procedures for effective maintenance of medium-voltage direct current (MVDC) electrical power systems is discussed in this recommended practice. Recommendations are made for analytical methods, preferred interconnection interfaces and performance characteristics for reliable integration of MVDC electrical components into the ship MVDC electrical power systems.