BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022


Annex A (normative)


Conductor requirements


Table A.1 gives allowable continuous current ratings, in amperes, at different temperature ratings and the minimum number of strands for conductors. These values have been determined for an ambient temperature of 30 °C and apply to single conductors and stranding when no more than three conductors are bundled together.


For conductors in engine rooms or when more than three conductors are bundled together, the maximum current rating in Table A.1 shall be derated by the factors given in Table A.2.


Table A.1— Cross-sectional area conductor, allowable permanent current and stranding


Cross-sectional area


mm2 0,75 1


1,5 2,5 4 6


10 16 25 35 50 70 95


120 150


Maximum continuous amperage capacity for single conductors at insulation temperature ratings


60 °C 6 8


12 17 22 29 40 54 71 87


105 135 165 190 220


70 °C 10 14 18 25 35 45 65 90


120 160 210 265 310 360 380


85 °C to 90 °C 105 °C 12 18 21 30 40 50 70


16 20 25 35 45 60 90


100 140 185 230 285 330 400 430


130 170 210 270 330 390 450 475


125 °C 20 25 30 40 50 70


100 150 185 225 300 360 410 480 520


200 °C 25 35 40 45 55 75


120 170 200 240 325 375 430 520 560


Minimum number of strandsb


Type A Type Ba 16 16 19 19 19 19 19 37 49


— — 26 41 65


127 127 127 259 418 418


a Conductors with Type B stranding shall be used for any wiring where frequent flexing is involved during use. b Conductor current ratings may be interpolated for cross-sectional areas between those shown above.


105 168 266 420 665


1 064 1 323 1 666 2 107 2 107


© ISO 2022 – All rights reserved


21


Distributed by the RYA under licence number 2020ET001 © BSI


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