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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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    I'm guessing this is a auxiliary (leisure) battery connection in the motorhome - if so the requirements for fault protection mean you can't just use plain unsheathed cables for battery connections - they need to be sheathed (or over taped) as far as the first overcurrent protective device (fuse) (BS 7671 reg A721.55.3.6 or similar wording in BS EN 1648)  - which might derate them a little from the manufacturer's rating for unsheathed use. (Unfortunately the automotive-style battery terminal mounted fuses aren't acceptable way to avoid that as overcurrent protective devices aren't allowed in the auxiliary battery compartment).


      - Andy.
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  • 0
    I'm guessing this is a auxiliary (leisure) battery connection in the motorhome - if so the requirements for fault protection mean you can't just use plain unsheathed cables for battery connections - they need to be sheathed (or over taped) as far as the first overcurrent protective device (fuse) (BS 7671 reg A721.55.3.6 or similar wording in BS EN 1648)  - which might derate them a little from the manufacturer's rating for unsheathed use. (Unfortunately the automotive-style battery terminal mounted fuses aren't acceptable way to avoid that as overcurrent protective devices aren't allowed in the auxiliary battery compartment).


      - Andy.
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