BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
9 Battery-disconnect switch, DC systems
9.1 A battery-disconnect switch shall be installed in the positive conductor of a system with grounded/earthed negative or the positive and negative conductor (simultaneously switched) of a fully insulated two-wire DC system. The disconnect switch shall be installed in a readily accessible location, and as close as practical to the battery or group of batteries. The following constitute exceptions:
a) outboard-powered craft with engine starting and navigation lighting circuits only;
b) electronic devices with protected memory and protective devices such as bilge pumps and alarms if individually protected by a circuit breaker or fuse as close as practical to the battery terminal;
c) engine/fuel tank compartment ventilation exhaust blower if separately protected by a fuse or circuit breaker as close as practical to the battery terminal;
d) charging devices which are intended to be used when the craft is unattended (e.g. solar panels, wind generators) if individually protected by a fuse or circuit breaker as close as practical to the battery terminal.
9.2 Battery switch ratings - The 30-second rating of a battery switch shall not be less than the maximum cranking current of the largest engine cranking motor that it serves. The minimum continuous rating of a battery switch shall be the total of the ampacities of the main overcurrent protection devices connected to the battery switch, or the ampacity of the feeder cable to the switch, whichever is less
9.3 Remote controlled battery disconnect switches, if used, shall also permit safe manual operation.
10 Power source options, AC systems 10.1 Power for the AC system shall be supplied by one of the following means:
a) single shore power cable, power inlet, wiring and components with a capacity to supply the required design system load;
b) separate shore power cables, power inlets, wiring and components with a capacity to supply the required design system loads;
c) inverter supplying AC power from the craft's DC system; d) onboard AC generator(s) supplying the required system load;
e) combination of shore power cable(s), onboard generator(s), inverters or inverter/chargers used simultaneously if the craft's circuitry is arranged such that the load connected to each source is isolated from the other sources or supplies are combined in accordance with 6.6.
10.2 The shore power cable(s) alone or with onboard generator(s) capacity shall be at least as large as the required system load(s).
10.3 Except for the system indicated in the Note below, the power feeder conductor from the AC generator shall be protected at the generator with overcurrent protection devices with a rating such that 120 % of the generator nominal output is not exceeded.
NOTE Self-limiting (self-adjusting) generators whose maximum overload current does not exceed 120% of
its rated current output do not require additional external overcurrent protection. See Annex D for examples of AC system diagrams.
© ISO 2022 – All rights reserved
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Distributed by the RYA under licence number 2020ET001 © BSI
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