The question of 1mm Twin & Earth Electrical Cable use for 12V.

kubeek

Joined Sep 20, 2005
5,621
That depends on the load current, and what they mean by the 1mm number - is it diameter or a wrongly stated crossection area? But generally there are no issues regarding the voltage itself.
 

bertus

Joined Apr 5, 2008
20,092
Hello,

In an automotive enviroment, there can be harsh situations.
Think of temperature changes.
Also movements can be of influence.
And the dirt can influence the cable.

Bertus
 

Thread Starter

jonnydolt

Joined Oct 23, 2015
112
The stuff I do is fairly small amperage like 12v actuators and timers switches etc .For 240v I always use 2.5mm unless it's drawing more than 10amp Here is the info from Olex itself https://www.olex.com.au/eservice/Australia-en_AU/navigateproduct_540307611/CNCP02A1002WVAA.html
2X1.0mm2 + E PVC Flat Red Black Cores with White Sheath
Description
2X1.0mm2 + E PVC Flat Red Black Cores with White Sheath
STANDARDS
National : AS/NZS 1125; AS/NZS 5000.2
DESCRIPTION
  • 2 & 3 core+earth flat,
  • 450/750V V-90 insulated,
  • PVC sheathed to AS/NZS 5000.2,
  • Copper conductors, 90°C.
  • Characteristics
    CONSTRUCTION CHARACTERISTICS
    Conductor material Copper
    With Green/Yellow core Yes
    Outer sheath PVC
    Type of conductor Solid copper
    With smaller neutral conductor No
    Colour White / Black / Red
    Insulation V-90
    DIMENSIONAL CHARACTERISTICS
    Nominal insulation thickness 0.6mm
    Nominal outer sheath thickness 0.9mm
    Conductor cross-section 1mm²
    Earth conductor cross section 1mm²
    Number of earth cores 1
    Number of cores 2
    Approximate weight 7.74kg/100m
    Cable length 100m
    Nominal overall diameter 8.9 x 4.2
    ELECTRICAL CHARACTERISTICS
    Inductive reactance at 50Hz 0.184Ohm/km
    Insulation resistance at 20°C 17.0MOhm.km
    Max. DC resistance of the conductor at 20°C 18.1Ohm/km
    Conductor AC resistance at 50 Hz 25.8Ohm/km
    Rated Voltage Uo/U (Um) 450 / 750 V
    MECHANICAL CHARACTERISTICS
    Cable flexibility Rigid
 

Dodgydave

Joined Jun 22, 2012
8,465
The only problem is vibrations , as car wiring is multi stranded, whereas T/E is solid and is prone to movement in a crimped environment, i have used it before but i always solder it if using crimps.
 

Thread Starter

jonnydolt

Joined Oct 23, 2015
112
Just looking at the cross section size the basic 3mm 10 amp cable that super cheap auto has is 1.13mm2 but the stuff from Olex/Bunnings has a cross section of 1mm2 doesn't seem to be a lot of difference.Neither state how many strands (per flexibility).I would assume that the insulation would be far superior on the 240v rated cable though
 

Thread Starter

jonnydolt

Joined Oct 23, 2015
112
I had some 1.5mm twin and earth and it has 7 strands I guess the 3mm auto cable would have near twice that,not that I will be using it in cars though ... EDIT ..Just found this it states 14 strands ...In tight or twisty spots I can see the need for so many strands
BrandBRITE LED TECH PTY LTD
Here we have available 3mm auto and marine cable by the meter.

(Can purchase 30 Meters on a roll and save even more)

3mm auto cable measures 2.8mm outside diameter

Available with a red or black insulation

3mm Cable has 14 wire strands, each strand being a standard of 0.32mm diameter, this ensure strength of each strand

3mm cable is used for applications where loads wont exceed 10Amp.
 
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