BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
12.3 In addition to the provisions of 12.1, the ungrounded conductors to a battery charger, alternator or other charging source shall be provided with overcurrent protection within the charging source, or within 1,8 m of the charging source, based on the maximum output of the device.
EXCEPTION Self-limiting devices. 13 Overcurrent protection, AC systems 13.1 General
13.1.1 In unpolarized systems, circuit breakers that open both active (phase) and neutral conductors simultaneously are required.
13.1.2 Fuses shall not be installed in unpolarized systems. If used in polarized systems, fuses shall be located to interrupt the active (phase) conductor.
13.1.3 Overcurrent protection devices for motor loads shall have a predetermined value of amperage consistent with electrical demand of the protected circuit.
13.1.4 All AC motor installations and each motor of a motor-operated device shall be individually protected in accordance with 13.1.3 or by an integral overcurrent or thermal protection device unless the motors do not overheat under continuous locked rotor conditions.
13.1.5 The rating of the overcurrent protection device shall not exceed the maximum current-carrying capacity of the conductor being protected. See Table A.1.
13.2 Supply circuits
13.2.1 Simultaneous (e.g. double pole) circuit breakers shall be installed in conductors to all supply circuits.
13.2.2 A manually reset trip-free circuit breaker shall be installed within 0,5 m of the source of power or, if impractical, the conductor from the source of power to the panel board circuit breaker shall be contained within a protective covering, such as a junction box, control box, enclosed panel board or within conduit or cable trunking or equivalent protective covering. If the location of the main shore power inlet circuit breaker exceeds 3m from the shore power inlet connection or the electrical attachment point of a permanently installed shore power cable, additional circuit breakers shall be provided within 3m of the inlet or attachment point to the electrical system in the craft, measured along the conductor.
13.2.3 Overcurrent protection shall be provided for isolation and polarization transformers, including a bank of transformers operating as a unit. Each transformer shall be protected by an individual overcurrent device on the primary side, rated at not more than 125% of the rated primary current of the transformer.
13.3 Branch circuits
13.3.1 The active (phase) conductor of each branch circuit in a polarized system shall be provided with overcurrent protection, i.e. fuse or circuit breaker, at the point of connection to the main panel board bus.
13.3.2 Both current-carrying conductors of each branch circuit in unpolarized systems shall be provided with overcurrent protection by double-pole circuit breakers and double-pole switches, at the point of connection to the main panel board bus.
NOTE 14
Use of a reverse polarity indicator presumes compliance with 13.3.1. © ISO 2022 – All rights reserved
Distributed by the RYA under licence number 2020ET001 © BSI
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