Conductor Requirements for ISO 10133 and ISO 13297
   
This appendix is reproduced from Annex 'A' (normative) of both ISO 10133 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  
Current Ratings    
Table A1 gives allowable continuous current ratings in amperes determined for an ambient temperature of 30°C and the minimum number of strands for conductors.    
Table A1 - Conductor cross-sectional area, allowable continuous current and stranding.
Maximum Current in amps for a single conductor at insulation temperature ratings
 
Cross sectional Area mm2
60°C
70°C
85 to 90°C
105°C
125°C
200°C
Minimum number of strands
 
Type A*
Type B*
 
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
29
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
 
NOTE: Conductor current ratings may be interpolated for cross sectional areas between those shown in Table A1.  
* Conductors with at least a Type A stranding shall be used for general wiring of craft. Conductors with Type B stranding shall be used for any wiring where frequent flexing is involved during use. For conductors in engine rooms (60c ambient), the maximum current rating in tableA1 shall be de-rated by the factors:-  
Temperature rating of conductor insulation °C
Multiply maximum current from table A1 by
 
70
0.75
 
85 to 90
0.82
 
105
0.86
 
125
0.89
 
200
1.0
 
BUNDLING (For a.c. only  
When more than three a.c. 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 building are cumulative where applicable.  
Bundling reduction factors are not normally considered necessary for d.c cables in small craft.