 | Home > Td5 > Rating of cable to +ve battery terminal |
 
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| alexatnd Member Since: 19 May 2015 Location: Yorkshire Posts: 272  
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I'm looking to connect one of these https://www.mudstuff.co.uk/blue-sea-fuse-block.html to the +ve battery terminal on my TD5 110. However this necessitates the replacement of the existing +ve feed with a different shaped clamp as the one thats there has the cable feeding directly into the clamp and its not removable.
Thought I'd just replace the whole existing cable with on with appropriate battery terminal eyes at each end. Found some for 16mm^2 cable and stud sizes. know the stud size hole will depend on the clamp I'm using, but does 16mm^2 cable sound the right size ? Santa - 1977 Series 3 - new chassis, tub, disc brakes,SU Carb Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost Effie - 2004 110 TD5 County |
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11th Jul 2018 2:35pm |
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..........provided the cable is flexible enough to fit..........perhaps a sparky may want to comment?| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1763 
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Pretty certain the original is 25mm. Runs to the fusebox under driver seat and the starter motor, but I can't remember where the split is!
To be honest, I wouldn't bother. I've got a ring crimp under the nut and bolt on the terminal clamp. Works great, no need to rip out the existing cabling. |
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21st Aug 2018 10:38pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20382
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It will need to be rated higher than the output of the Alternator.
Different sizes have different current ratings, but the cable current rating will need to exceed the Alternator output. ALM Electrical do a good selection of 'flexible' plain battery cables. I have no connection with them but have been very good. Don't go for any old battery or welding cable, some can be extremely stiff and make it near impossible to install and route neatly. Alternatively check out OFC or TOFC car audio cable, this should be very flexible too and I'd imagine you'd want something like 4ga but you cannot guesstimate in this instance. Do you have a photo of your battery post set up? $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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21st Aug 2018 11:15pm |
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| PaulMc Member Since: 17 Jan 2009 Location: Kent Posts: 501 
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According to Land Rover's Electrical Wiring Diagrams for the 2002MY TD5 Defender -
The live from the battery to the starter is 40mm² The battery earth is 40mm² The live from the battery to the underseat fuse box is 10mm² . Paul. 1989 Arles Blue 2.5TD 110 Hardtop 1999 Epsom Green Discovery II 4.0 V8i 'XS' |
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22nd Aug 2018 1:05am |
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| Marks Landy Member Since: 09 Feb 2015 Location: Cheshire Posts: 299 
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The positive battery cable on my 200TDI is 25mm2.
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22nd Aug 2018 8:57am |
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| nitram17 Member Since: 08 Jun 2014 Location: newcastle Posts: 2261 |
I don't know about the OP.......but I am now confused!do people go for the minimum thickness they can get away with or the maximum they can use with regard to flexibility..".i thought that 35mm2 cable was about right for jump leads so by inference.......must be ok for battery leads on the defender!
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22nd Aug 2018 12:45pm |
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| nitram17 Member Since: 08 Jun 2014 Location: newcastle Posts: 2261 |
Having looked at the legend on the wiring diagram it states 40mm OD but is that including the insulation?whats the convention for wire rating? |
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22nd Aug 2018 1:00pm |
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| PaulMc Member Since: 17 Jan 2009 Location: Kent Posts: 501
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It's shown as - 40.0
From the HOW TO USE THE CIRCUIT DIAGRAMS at the front of the wiring diagrams - Wire attributes Additional information (separated by a ‘,’) is shown alongside the wire colour: Wire gauge - the cross-sectional area of the wire in square millimetres. This is included to help you select the correct wire during harness repair. Paul. 1989 Arles Blue 2.5TD 110 Hardtop 1999 Epsom Green Discovery II 4.0 V8i 'XS' |
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22nd Aug 2018 2:51pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17391 
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An electrical conductor with an OD of 40mm would have a CSA in excess of 1200mm^2 and would be a little OTT for this application!  |
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22nd Aug 2018 3:33pm |
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| nitram17 Member Since: 08 Jun 2014 Location: newcastle Posts: 2261 |
Thanks .so the 40mmo d refers to the metal wire and does not include the insulation........40mm is some thick wire then! cross sectional area is not the same as diameter though?..i think i will visit confused dot com  doesnt 35mm2 wire have a diameter of 11.9 mmish?wheres a sparky when you want one? |
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22nd Aug 2018 9:29pm |
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| steve_c3 Member Since: 30 Apr 2015 Location: Hants Posts: 173 
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I’m not a sparky but is it as simple as working out the area of a circle from it’s radius? The website below makes it easy...just put the area as 40mm2 or whatever and it will tell you the Diameter of the circle or in this case the width of the wire.
From an electrical point of view though, I don’t know whether the mm2 measurement includes the insulation or not. https://www.calculator.net/circle-calculat...0&y=25 2002 Defender 110 CSW TD5 |
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22nd Aug 2018 10:45pm |
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| nitram17 Member Since: 08 Jun 2014 Location: newcastle Posts: 2261 |
i need a brain dat scan and a new pair of specs  i mis read the diagram! |
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22nd Aug 2018 11:02pm |
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| apt100 Member Since: 05 Mar 2015 Location: Derbyshire Posts: 1547 
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^^ the cross sectional area (eg 40mm2 or 35mm2 or whatever) is the area of the copper as this is what carries the current. It doesn't include the insulation
and as you say it is just the area of a circle, so area= pi x radius x radius (and radius is half the diameter) so, as above... 40mm diameter is 20mm radius, so area = pi x 20 x 20 = 3andabit x 400 = 1200mm2 andabit edit: my reply was to steve Last edited by apt100 on 22nd Aug 2018 11:10pm. Edited 1 time in total |
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22nd Aug 2018 11:09pm |
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| nitram17 Member Since: 08 Jun 2014 Location: newcastle Posts: 2261 |
Right as always blackwolf!... this gives both od and mm2 http://www.vehicle-wiring-products.eu/prod...e........I misread zero d on the electrical diagram and took it for. OD outside diameter because I'm getting old and befuddled.....anyway a minimum of 25mm2 would be my choice for battery cable but when joining cable I would always use like for like ...therefore 40 mm2 on the 2002 would be my choice . |
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22nd Aug 2018 11:09pm |
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