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Marine Cable Selection Guide

 

Current Loading

 

Amps

12 Volts Cable Thickness Table©Boat Electricals Ltd 3/9/2010
Allowing for a 3%  Voltage Drop

Critical Applications: Electronics, Bilge Pumps, Navigation Lights, Fluorescent Deck Lights

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

Total Circuit Length From Source To Device And Back To Source i.e 2 x Distance to Equipment

1

0.5mm2

0.5mm2

1mm2

1mm2

1.5mm2

1.5mm2

2.5mm2

2

0.5mm2

1mm2

1.5mm2

2.5mm2

2.5mm2

4mm2

4mm2

5

1mm2

1.5mm2

4mm2

6mm2

6mm2

6mm2

10mm2

10

1.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

16mm2

15

2.5mm2

6mm2

10mm2

16mm2

16mm2

25mm2

25mm2

20

4mm2

6mm2

10mm2

16mm2

25mm2

25mm2

35mm2

25

4mm2

10mm2

16mm2

25mm2

25mm2

35mm2

50mm2

30

6mm2

10mm2

16mm2

25mm2

35mm2

50mm2

50mm2

40

6mm2

16mm2

25mm2

35mm2

50mm2

50mm2

70mm2

50

10mm2

16mm2

25mm2

50mm2

50mm2

70mm2

70mm2

60

10mm2

25mm2

35mm2

50mm2

70mm2

70mm2

70mm2

70

10mm2

25mm2

35mm2

70mm2

95mm2

95mm2

120mm2

80

16mm2

35mm2

50mm2

70mm2

95mm2

95mm2

120mm2

90

16mm2

35mm2

50mm2

70mm2

95mm2

95mm2

120mm2

100

16mm2

35mm2

50mm2

70mm2

95mm2

95mm2

120mm2

 

3m (10ft)

6m (20ft)

10m(30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m(100ft)

 

 

 

 

 

Current Loading


Amps

12 Volts Cable Thickness Table ©Boat Electricals Ltd 3/9/2010
 
Allowing for a 10% Voltage Drop

Non-Critical Applications: Windlass, Flood Lights, Cabin Lights etc.

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

Total Circuit Length From Source To Device And Back To Source i.e 2 x Distance to Equipment

1

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

1mm2

1mm2

1mm2

5

0.5mm2

0.5mm2

1mm2

1.5mm2

2.5mm2

2.5mm2

2.5mm2

10

0.5mm2

1mm2

2.5mm2

2.5mm2

4mm2

4mm2

6mm2

15

1mm2

1.5mm2

2.5mm2

4mm2

6mm2

6mm2

10mm2

20

1mm2

2.5mm2

4mm2

6mm2

10mm2

10mm2

10mm2

25

1.5mm2

2.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

30

1.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

16mm2

40

2.5mm2

4mm2

10mm2

10mm2

16mm2

16mm2

25mm2

50

2.5mm2

6mm2

10mm2

16mm2

16mm2

25mm2

25mm2

60

4mm2

6mm2

10mm2

16mm2

25mm2

25mm2

35mm2

70

4mm2

10mm2

16mm2

25mm2

25mm2

35mm2

35mm2

80

4mm2

10mm2

16mm2

25mm2

35mm2

35mm2

50mm2

90

6mm2

10mm2

16mm2

25mm2

35mm2

50mm2

50mm2

100

6mm2

10mm2

16mm2

25mm2

35mm2

50mm2

50mm2

 

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

 

Note: The above tables are for guidance purposes only.
No allowance has been made for temperature increases due to bundling or for high ambient air temperatures.


 

24 Volt Cable Thickness Guide

Work out the total current loading in Amps for each cable. Amps can be calculated by dividing watts by the voltage.

Measure (or estimate) how long the cable run will be and double this number to arrive at the total circuit length.

 

 

 

Current Loading

 

Amps

24 Volts Cable Thickness Table©Boat Electricals Ltd 3/9/2010
Allowing for a 3% Voltage Drop

Critical Applications: Electronics, Bilge Pumps, Navigation Lights, Fluorescent Deck Lights

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

Total Circuit Length From Source To Device And Back To Source i.e 2 x Distance to Equipment

1

0.5mm2

0.5mm2

0.5mm2

0.5mm2

1mm2

1mm2

1mm2

2

0.5mm2

0.5mm2

1mm2

1mm2

1.5mm2

1.5mm2

2.5mm2

5

0.5mm2

1mm2

1.5mm2

2.5mm2

4mm2

4mm2

6mm2

10

1mm2

2.5mm2

4mm2

6mm2

6mm2

6mm2

10mm2

15

1.5mm2

2.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

20

2.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

16mm2

25

2.5mm2

4mm2

6mm2

10mm2

16mm2

16mm2

25mm2

30

2.5mm2

6mm2

10mm2

16mm2

16mm2

25mm2

25mm2

40

4mm2

6mm2

10mm2

16mm2

25mm2

25mm2

35mm2

50

4mm2

10mm2

16mm2

25mm2

25mm2

35mm2

50mm2

60

6mm2

10mm2

16mm2

25mm2

35mm2

50mm2

50mm2

70

6mm2

10mm2

16mm2

35mm2

35mm2

50mm2

50mm2

80

6mm2

16mm2

25mm2

35mm2

50mm2

50mm2

70mm2

90

10mm2

16mm2

25mm2

50mm2

50mm2

70mm2

70mm2

100

10mm2

16mm2

25mm2

50mm2

50mm2

70mm2

70mm2

 

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

 

Current Loading

 

Amps

24 Volts Cable Thickness Table ©Boat Electricals Ltd 3/9/2010
 
Allowing for a 10% Voltage Drop

Non-Critical Applications: Windlass, Flood Lights, Cabin Lights etc

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

Total Circuit Length From Source To Device And Back To Source i.e 2 x Distance to Equipment

1

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

0.5mm2

5

0.5mm2

0.5mm2

0.5mm2

1mm2

1mm2

1mm2

1.5mm2

10

0.5mm2

0.5mm2

1mm2

1.5mm2

2.5mm2

1mm2

2.5mm2

15

0.5mm2

1mm2

1.5mm2

2.5mm2

2.5mm2

4mm2

4mm2

20

0.5mm2

1mm2

2.5mm2

2.5mm2

4mm2

4mm2

6mm2

25

1mm2

1.5mm2

2.5mm2

4mm2

4mm2

6mm2

6mm2

30

1mm2

1.5mm2

2.5mm2

4mm2

6mm2

6mm2

10mm2

40

1mm2

2.5mm2

4mm2

6mm2

10mm2

10mm2

10mm2

50

1.5mm2

2.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

60

1.5mm2

4mm2

6mm2

10mm2

10mm2

16mm2

16mm2

70

2.5mm2

4mm2

6mm2

10mm2

16mm2

16mm2

25mm2

80

2.5mm2

4mm2

10mm2

10mm2

16mm2

25mm2

25mm2

90

2.5mm2

6mm2

10mm2

16mm2

16mm2

25mm2

25mm2

100

2.5mm2

6mm2

10mm2

16mm2

25mm2

25mm2

25mm2

 

3m (10ft)

6m (20ft)

10m (30ft)

15m (50ft)

20m (65ft)

25m (80ft)

30m (100ft)

 

Note: The above tables are for guidance purposes only.
No allowance has been made for temperature increases due to bundling or for high ambient air temperatures. 



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