IEC 60092-201:2019 is applicable to the main features of system design of electrical installations for use in ships.This fifth edition cancels and replaces the fourth edition, published in 1994. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) a new subclause regarding studies and calculations has been added; b) a new subclause regarding documentation has been added; c) the clause regarding distribution systems has been rewritten; d) a clause regarding system earthing has been added; e) the clause regarding sources of electrical power has been rewritten; f) the clause regarding distribution system requirements has been rewritten; g) the clause regarding cables has been deleted and transferred to IEC 60092-401; h) a new subclause regarding electric and electrohydraulic steering gear has been added.