4 B&S Single Core Battery Cable
Genuine Australian made TYCAB 4 B&S battery and starter cable, ideal for use in dual battery systems, caravans or any other auxiliary power application up to 135amp*
Part # Prefix: C4
Sheath Colours: Black, Red
Lengths: By the metre, 10m, 30m
* Refer Specifications and derating factors
AMP Rating at 30°C: 135 amp (JASO D609 derating factors apply)
Tycab Code: ABC128703
Nearest AWG: 4
Strand #/Size: 252/0.32
Nominal Area: 20.26mm²
Insulation Thickness: 1.1mm
Electrical Resistance at 20°C: 0.9 ohm/km
Nominal O.D.: 8.3mm
Mass (kg/100m): 22.4
Conductor: OXYGEN FREE Plain Copper Wire to AS/NZS 1125
Insulation: V90 degrees Celsius PVC to AS/NZS 3808
Derating Factors for Bundling of Single Core Cables per JASO D609
As the number of cables bundled together increases, the current capacity of each cable in the bundle decreases as per the following chart.
Cable Bundle Qty = Derating Factor for 4 B&S
1 x Cable = 100% capacity (135amp)
2 x Cables = 80% capacity (108amp)
3 x Cables = 70% capacity (95amp)
4 x Cables = 60% capacity (81amp)
5 x Cables = 55% capacity (74amp)
6 x Cables = 50% capacity (68amp)
7 x Cables = 50% capacity (68amp)
Derating Factors for Ambient Temperatures °C per JASO D609
As the ambient temperature increases, the current capacity of the cable decreases as per the following chart.
Ambiebt Temperature °C = Derating Factor for 4 B&S
30°C = 100% capacity (135amp)
40°C = 90% capacity (122amp)
50°C = 76% capacity (103amp)
60°C = 60% capacity (81amp)
70°C = 45% capacity (61amp)
Download Sizing Guide
Voltage Drop for 4B&S Cable:
To calculate the voltage drop of 4 B&S copper cable, use the following formula:
Voltage Drop = Length x Current x 0.017
Length = Total length of cable in metres.
Current = Current draw (amps) through the cable.
Area = Cross sectional area of the copper (in this case 20.26mm²)
Formula only applies to copper at 25°C, voltage drop increases with both ambient and cable temperature, at approx 0.4% per °C.
0.017 - This multiplication factor only applies to copper
Example for 4 B&S:
How much voltage drop over 10m of 4 B&S with a current draw of 135A?
- 10m x 135A x 0.017 = 22.95
Divide this by 20.26 (cross sectional area of 4 B&S - mm²)
You will have a drop of approximatley 1.13 Volts over the 10m length