WIRING STANDARDS FOR RECREATIONAL CRAFT DIRECTIVE		  
Conductor Requirements
For ISO 10133 AND ISO 13297

This appendix is reproduced from Annex A (normative) of both ISO10133 and 13297.Both ISOs are supporting standards to the Recreational Directive. The use of these Recommendations can be used to demonstrate compliance to this directive.		 Printable PDF Version  
Section 1      
Tables A1 gives allowable continuous current ratings In amperes determined for 30°C ambient temperature  
Cross-sectional area mm sq.
Maximum current in amperes, for single conductors At insulation temperature ratings
Minimum Number of strands
 
60
deg. (C)
70
deg. (C)
85 - 90
deg. (C)
105
deg. (C)
125
deg. (C)
200
deg. (C)
Type 1*
Type 2*
  
0.75
6
10
12
16
20
25
16
 
1
8
14
18
20
25
35
16
 
1.5
12
18
21
25
30
40
19
26
  
2.5
17
25
30
35
40
45
19
41
  
4
22
35
40
45
50
55
19
65
  
6
39
45
50
60
70
75
19
105
  
10
40
65
70
90
100
120
19
168
  
16
54
90
100
130
150
170
37
266
  
25
71
120
140
170
185
200
49
420
  
35
87
160
185
210
225
240
127
665
  
50
105
210
230
270
300
325
127
1064
  
70
135
265
285
330
360
375
127
1323
  
95
165
310
330
390
410
430
259
1666
  
120
190
360
400
450
480
520
418
2107
  
150
220
380
430
475
520
560
418
2107
  
Conductors current ratings may be interpolated for cross sectional areas between those shown in Table A1

*Conductors with at least a type 1 stranding shall be used for general craft wiring. Conductors with type 2 stranding shall be used for any wiring where frequent flexing is involved in use
 
For conductors in engine room(60°C ambient ) maximum current rating in table A1 shall be de-rated by the factors:-  
Temperature rating of conductor insulation (deg. C)
Multiply maximum current from table A1 by –
  
70
0.75
  
85 to 95
0.82
  
105
0.86
  
125
0.89
  
200
1.0
  
Bundling
  
For ac Only:-
When More than three ac conductors are bundled together the maximum current ratings in Table A1 shall be de-rated by the factor below:
  
Number of conductors bundled
Multiply maximum current from A1 by:
  
4 to 6
0.7
  
7 to 24
0.6
  
25 or more
0.5
  

Note: De-rating reductions for temperature and bundling are cumulative where applicable.

Note: Bundling reduction factors are not normally considered necessary for dc cables in small craft.

 
For information, (extra low voltage dc only) the volt drop on load may be calculated by using the following formula:
 
E= 0.0164 x I x L
S

Where

E = Volts drop in volts

S = the conductor cross-section area in square millimetres

I = the load current in amperes

L = the total length, in metres, of conductor from the positive power source Connection to the electrical device and back to the negative source connection.

 
In the UK cables are sold to British Standards and below are some notes:  
A. The current ratings are similar to those in BS 7671 (was IEE 16th Edition) Generally speaking the ratings for 60,70,90, and 105 degrees C are those most relevant, and are within 10% of those in BS7671 B. Confusion may occur regarding temperature rating BS 7671 and the other relevant British Standards relate to conductor temperature whereas Table A1 relates to insulation temperature.    
Types and Properties of suitable Cables

All cables that are Class 5 Flexible (multi-stranded) to BS6500 will also meet the stranding requirements of the Table A1 in ISO 10133
and ISO 1329

Cables for use as mains shore connections are available designated as Arctic Grade (3183Y/AG) with coloured sheaths as follows:

  
 
110/130 volts
Yellow
  
220/240 volts
Blue
  
380/415 volts
Red
  
General Purpose Rubber ( 60/70°C ) Heat Resisting Rubber Cables( 85°C )
Insulated and sheathed cables (318TRS), is not recommended. Rubber has poor wear characteristics, tears easily and deteriorates due to weather.

These cables are more suitable. They are EPR insulated and CSP sheathed but again care must be taken to avoid damage to the sheath. They are also HOFR rated, ie heat resisting oil resisting and flame retardant.

Suitable types are 3182TQ, 3183TQ etc which are class 5 flexible 2 core and 3 core cable etc.

All cables with pvc insulation and sheathed to BS6746 are flame retardant and have good wear and weather resistant properties.

General Purpose PVC ( 60/70°C )    
Insulated and sheathed cables (pvc/pvc), multicore which are class5 flexible meet the requirements of the RCD

Suitable types are:

218*Y – circular pvc/pvc . . . to BS 6500 flexible cord — (*- indicates number of cores)

2196Y – flat 2 core pvc/pvc . . . to BS6500 flexible cord

318*Y – circular pvc/pvc . . . to BS6500 flexible cord — (*- indicates number of cores)

3192Y – flat 2 core pvc/pvc . . . to BS6500 flexible cord
Heat Resisting PVC ( 85°C ) YY Control Flexible
To BS 6141, insulated and sheathed cables (pvc/pvc) multicore which are classed 5 flexible meet the requirements of ISO 10133 and ISO 13297 This cable is a class 5 flexible, insulated and sheathed multicore cables with coloured and/or numbered cores to German VDE specification.

Suitable types are:

2093Y . . . circular 3 core pvc/pvc . . . to BS 6500 flexible cord

309*Y . . . circular pvc/pvc . . . to BS 6500 flexible cord — (*- indicates number of cores)

  
Heat Resisting PVC ( 90/105°C ) Auto Wiring Table

Insulated ( not sheathed ) single core cable known as Tri-Rated cable and is class 5 flexible meeting the requirements of ISO 10133 and ISO 13297.

United States and Canadian rating is to 105°C and UK rating is to 90°C as per BS6231

Type CK is the most widely available version of Tri Rated cable and is rated at 600V ac to earth and 1000V dc to earth

Tri Rated cable is available in sizes from 0.5 mm_ to 240 mm_ and is recommended for panel wiring. It can also be used for general wiring if installed in a cable tray, trunking or conduit, and for battery and charging systems

To BS 6862 is a general purpose 70°C pvc cable The voltage rating of this cable is 100 volts and therefore must only be used for extra low voltage, ie 12/24 volt applications and not for 230volt wiring. Auto wiring is ideal for making up looms using insulated single cores with wide selection of colours available for easy identification.

Available in sizes up to 60 mm_, but single core 0.5 mm_,0.65 mm_ and1 mm_ do Not meet the required minimum number of strands as in Table A1 Conductor Requirements in this appendix

Multicore cables are also available as Auto wiring.

Battery Wiring  

Cables to BS 6862 ( Auto wiring up to 60 mm sq. are suitable

Tri-rated cable to BS 6231 is multi-stranded with thick pvc insulation suitable for battery wiring

Welding cables to BS 638 has EPR/CSP insulation / sheath but has high number of very fine strands which will break if subjected to movement, so care must be taken regarding installation and use.