MT 22 - TC 18/MT 22

IEC 60092-507:2014 specifies requirements for the design, construction and installation of electrical systems in small vessels, which have a length of up to 50 m, or which have a gross tonnage not exceeding 500 Gross Tonnes (GT), designed for use on inland waters or at sea. It is not intended to apply to:
a) small craft equipped only with a battery supplying circuits for engine starting and navigation lighting recharged from an inboard or outboard engine driven alternator.
b) recreational craft of less than 24 m hull length requiring to conform to the Recreational Craft Directive 94/25/EC Annex 1 Essential Requirements Part 5.3 Electrical systems, except for three-phase alternating current installations in such recreational craft which operate at a nominal voltage not exceeding AC 500 V. This third edition includes the following significant technical changes with respect to the previous edition:
a) The standard now clarifies its application for electrical installations in those recreational craft which require to conform to the Recreational Craft Directive.
b) The standard specifies requirements for methods of galvanic isolation for small vessels and recreational craft connecting to a low voltage AC shore supply.
c) The standard includes design guidance for electric propulsion systems suitable for small vessels and associated installation requirements.