BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
17.2 Each conductor longer than 175 mm installed separately shall be at least 1 mm2. Each conductor in a multi-conductor sheath shall be at least 0,75 mm2 and can extend out of the sheath a distance not exceeding 800 mm.
EXCEPTION Conductors of minimum 0,75mm2 used as internal wiring in panel boards.
18 Conductors, DC systems 18.1 Electrical distribution shall use insulated stranded copper conductors, see Table A.1. Conductor insulation shall be of fire-retardant material.
18.2 Conductors shall be sized as a minimum in accordance with Table A.1, or the conductor manufacturers rated current amperage, based on the load to be supplied and allowable voltage drop for the load to be carried. See 5.6.
18.3 All equipotential bonding conductors shall be identified by green or green with yellow stripe insulation, or can be uninsulated strip or braid. Conductors with green or green with yellow stripe insulation shall not be used for current-carrying conductors.
NOTE The protective conductors of the AC electrical system, also uses green or green with yellow stripe insulation and can be connected to the craft engine DC negative terminal.
18.4 Means of identification other than insulation colour for DC positive conductors is permitted if properly identified on the craft wiring diagrams of the electrical system(s).
18.5 All DC negative conductors shall be identified by black or yellow insulation. If the craft is equipped with an AC electrical system which use black insulation for live conductors, yellow insulation shall be used for DC negative conductors of the DC system. Black or yellow insulation shall not be used for DC positive conductors.
18.6 Means of identification other than insulation colour for DC negative conductors if the craft is fitted with multiple independent DC systems is permitted if properly identified on the conductor and craft wiring diagrams of the electrical system(s).
NOTE 1 A colour stripe can be added to conductor insulation for identification in the system.
Craft with AC and DC systems shall avoid the use of brown, white or light blue insulation colour in the DC system, unless clearly separated from the AC conductors and identified as DC. NOTE 2 For additional conductor specifications see ISO 6722-1:2011[1].
NOTE 3 An example of multiple independent DC systems would be a 12 V and 24 V system or a separate electronics battery bank which do not share the DC negative.
19 Conductors, AC systems 19.1 Conductors and flexible cords shall have a minimum rating of 300 V to 500 V. Conductors and flexible cords shall be multi-strand copper, with cross-sectional areas no smaller than those determined using Table A.1. NOTE
A conductor used for equipment grounding is not considered a current-carrying conductor when referencing Table A.1.
19.2 The insulation temperature rating of conductors and flexible cords outside engine spaces shall be at least 60 °C. 16
© ISO 2022 – All rights reserved
Distributed by the RYA under licence number 2020ET001 © BSI
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