BS EN ISO 13297:2021+A11:2023 ISO 13297:2020+A1:2022
d) a separate trunking system, conduit or sheathing is used; e) the DC and AC conductors are fixed directly to a surface and separated by at least 100mm.
20.5 Current carrying conductors shall be routed above areas where water can accumulate (e.g. bilges), and at least 25 mm above the level at which the automatic bilge pump switch activates.
EXCEPTION If conductors must be routed below anticipated bilge water level, the wiring and connections shall be in enclosures conforming to IEC 60529:1989 - IP67, as a minimum, and there shall be no connection below the foreseeable water level.
20.6 Conductors shall be routed away from exhaust pipes and other heat sources which can damage the insulation. The minimum clearance is 50mm from water cooled exhaust components and 250mm from dry exhaust components, unless an equivalent thermal barrier is provided.
20.7 Metals used for terminal studs, nuts and washers shall be corrosion-resistant and galvanically compatible with the conductor and terminal. Aluminium and unplated steel shall not be used for studs, nuts or washers in electrical circuits.
20.8 All conductors shall have suitable terminals installed, i.e. no bare wires to stud or screw connections.
20.9 Screw-clamp terminals or screwless terminal blocks shall clamp conductors to ensure mechanical linkage and electrical contact is properly maintained without damaging the conductor strands. Other terminals shall be of the ring or captive spade type not dependent on screw or nut tightness alone for retention on the screw or stud. Friction type connectors on conductors can be used in circuits not exceeding 20 A if the connection does not separate when subjected to a force of 20 N.
20.10 Twist-on connectors (wire nuts) shall not be used.
20.11 Exposed shanks of terminals shall be protected against accidental shorting by the use of insulation barriers or sleeves, except for those in the grounding system.
20.12 Solderless crimp-on terminals and connectors shall be attached with the type of crimping tool designed for the termination used and for a connection meeting the following requirements:
20.13 Conductor-to-connector and conductor-to-terminal connections shall be capable of withstanding a tensile force equal to at least the value shown in Table 1 for the smaller conductor in the connection, without separating.
Table 1— Tensile force
Conductor size Tensile force mm2
N
0,75 1
1,5 2,5 4
40 60
130 150 170
Conductor size Tensile force mm2
N 6
10 16 25 35
200 220 260 310 350
Conductor size Tensile force mm2
N
50 70 95
120 150
20.14 No more than four conductor terminals shall be secured to one terminal stud.
400 440 550 660 770
18
© ISO 2022 – All rights reserved
Distributed by the RYA under licence number 2020ET001 © BSI
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