BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
b) navigation lights; c) bilge blowers; d) bilge pumps.
6 General requirements, AC systems
6.1 The protective conductor insulation shall be green or green with a yellow stripe. Neither colour shall be used for current-carrying conductors. NOTE
The equipotential bonding conductor of the DC electrical system also uses green or green with a
yellow stripe insulation and is connected to various exposed conductive parts of DC electrical devices, other extraneous conductive parts and the DC negative ground/earth.
6.2 For craft having a fully insulated DC system, the AC protective conductor shall be connected to: a) for metallic hulled craft, the hull; b) for non-conductive hulls, the craft's external ground/earth or ground plate.
6.3 The AC protective conductor(s) shall be provided with a final (single) connection to the hull of a metallic hull craft, or, if the craft has a non-metallic hull, to the main grounding/earthing point of the craft.
6.4 On metallic hulls, the point of connection of the protective conductor shall be located above any anticipated water accumulation.
6.5 Metallic housings or enclosures of permanently installed AC electrical appliances shall be connected to the protective conductor system in the craft.
6.6 Individual circuits shall not be capable of being energized by more than one source of electrical power at a time. Each shore power inlet, generator or inverter is a separate source of electrical power. The transfer from one power source circuit to another shall be made by a means which opens all current- carrying conductors, active (phase) and neutral, before closing the alternate source circuit, to prevent arc-over between contacts, and should be interlocked by mechanical or electromechanical means. A device that simultaneously breaks both current carrying conductors, active (phase) and neutral, shall be used when changing power sources.
The requirements for overcurrent protection are found in Clause 13. A combination of power sources can be used provided that:
a) the device is constructed and tested to an applicable recognized standard; b) the device includes protection to prevent backfeeding to shore power (anti-islanding protection); c) the device includes personnel protection against backfeeding; d) the installation is performed according to the manufacturer’s instructions.
6.7 Energized parts of electrical equipment shall be guarded against accidental contact by the use of enclosures conforming to at least IEC 60529:1989-IP 2X or other protective means which shall not be used for non-electrical equipment. Access to energized parts of the electrical system shall require the use of hand tools or be at least IP 2X, unless otherwise specified. A suitable warning sign shall be displayed (see 7.2).
6.8 The neutral conductor shall be grounded (earthed) only at the source of power, i.e. at the onboard generator, the secondary windings of the isolation or polarization transformer, the shore power
© ISO 2022 – All rights reserved 7
Distributed by the RYA under licence number 2020ET001 © BSI
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