4 B&S Battery Cable





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: Cut by the metre up to 30m, Also available in 100m reels by request.


 * 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

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)




  • Battery and starter systems

  • Dual battery systems

  • Caravans and 4WD's

  • Auxiliary power applications

  • Charging systems


Size Guide


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
                                      Area (20.26)


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)


  • 22.953/20.26 = 1.133V


You will have a drop of approximatley 1.13 Volts over the 10m length