BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
connection or inverter. The shore power neutral shall be grounded (earthed) through the shore power cable and shall not be grounded (earthed) on board the craft or:
a) for systems using an isolation transformer or polarization transformer, both the generator or inverter neutral and the transformer secondary neutrals may be grounded at the AC main grounding bus instead of at the generator, inverter, or transformer secondaries;
b) for systems using an isolation transformer or polarization transformer, or no shore power provision, both the generator or inverter neutral and the transformer secondary neutrals may be ungrounded provided double-pole protection and switching is installed.
6.9 When a galvanic isolator is fitted in the protective conductor, failure of the isolator shall not result in an open circuit.
6.10 If the polarity of the system must be maintained for the proper operation of the electrical devices in the system, reverse polarity indicating devices providing a continuous visible or audible signal shall be installed in shore power systems and shall respond to the reversal of the active (phase) and the neutral conductors. Otherwise, a branch circuit shall be provided with overcurrent protection in only the active (phase) conductor.
Reverse polarity indicating devices are not required on craft employing: a) unpolarized systems using double-pole branch circuit protection; b) polarization or isolation transformers that establish polarity on the craft.
NOTE 1 Reverse polarity indicating devices might not respond to reversals of a live conductor and the protective conductor.
NOTE 2 Reverse polarity indicating devices respond to the reversal of an active (phase) conductor or grounded conductor only when there is continuity of the protective conductor to shore.
7 Marking, AC systems 7.1 Shore power inlets shall be marked to indicate voltage and current; they shall also be marked with the electricity warning symbol (ISO 7010:2019-W012) and the "refer to instruction manual/booklet" symbol (ISO 7010:2019-M002).
7.2 A permanently mounted waterproof warning sign shall be located at the panel board on the craft. The sign shall include the information shown in Figure 1 a) or 1 b).
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© ISO 2022 – All rights reserved
Distributed by the RYA under licence number 2020ET001 © BSI
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