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Cable current rating advice

Former Community Member
Former Community Member
Hi all, I would like to verify something with respect to current carrying capacity of cable. Specifically vehicle single core DC circuits.


Looking at 16mm wire not worrying about voltage drop. manufacturers are ratting this at 110A and on a forum I subscribe to people have been advised 125A is ok.


The cable is rated at 70 deg as shown on the suppliers site linked below.

16mm supplier


Am I wright that this comes under 

Table 4D1A


Single-core 70°C Thermoplastic Insulated Cables, Non-Armoured, with or without Sheath


Reference Method C (clipped direct) This will be between battery to battery not in any conduit or insulation


So is rated as 87A


I would be interested in your advice as it has been several years since I used these tables
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  • Former Community Member
    0 Former Community Member
    Hi Roger, thank you for the reply. 

    This wiring is for charging on a motorhome. Now days with Lithium batteries you can charge at very high currents for a longer period of time than just starting a vehicle.


    I would expect there would be some sort of regulation on the amount of current a cable can withstand before it starts to degrade the insulation. I understand the VD and the cable in question is ok for this.


    I wonder if we do not have a regulation then where do we draw the line,  like you say 125a or 150a what is the limit. There must be data on this somewhere for insurance purposes if nothing else
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  • Former Community Member
    0 Former Community Member
    Hi Roger, thank you for the reply. 

    This wiring is for charging on a motorhome. Now days with Lithium batteries you can charge at very high currents for a longer period of time than just starting a vehicle.


    I would expect there would be some sort of regulation on the amount of current a cable can withstand before it starts to degrade the insulation. I understand the VD and the cable in question is ok for this.


    I wonder if we do not have a regulation then where do we draw the line,  like you say 125a or 150a what is the limit. There must be data on this somewhere for insurance purposes if nothing else
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