220 Flex can it be used for 12v

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Vis
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Tue Aug 16, 2016 2:11 pm

Hi Guys, can I use 220v Flex to wire up a 12v Led worklight, or must I use automotive wire?
Thanx.
Elvy
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2008 Fortuner 4x4
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niclemaitre
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Tue Aug 16, 2016 2:14 pm

220v flex is usually low amp rating since the volts are relatively high. 12V is relatively low so the amps are higher but generally not excessively so. What's the max current draw on the lamp?
Happy trails
Nic

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ChrisF
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Tue Aug 16, 2016 2:30 pm

The wire "size" relates to the current it can carry :

Cable size in mm square....1...1,5...2,5...4.....6.....10...16
Current carrying capacity..11...14....18...25....32....43...57

You get "flex" from 1mm2 (read: one-millimeter-squared) up to 4mm2. As you can see the current carrying capacity varies drastically.


If you give a bit more information on your worklight (rated power) we can help with the wire selection.

Vis
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Wed Aug 17, 2016 1:30 pm

Hi Chris,
It is the 27 watt work light from 4x4 direct. I do have the red and blue automotive wires,but because the wires wil be running on my cattlerails I wanted to go to black flex .
Thanx.
Elvy
2011 Hilux D4D 4x4 s/c
2008 Fortuner 4x4
1993 Hilux d/c sfa

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niclemaitre
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Wed Aug 17, 2016 2:04 pm

A 27W lamp will draw 2.5A at 12V

I(A) = P(W) / V(V)

That's easily within the spec of normal household extension flex
Happy trails
Nic

SFA '97 DC affirmatively shopped
SFA '87 DC "Rooies"

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ChrisF
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Wed Aug 17, 2016 2:18 pm

niclemaitre wrote:A 27W lamp will draw 2.5A at 12V

I(A) = P(W) / V(V)

That's easily within the spec of normal household extension flex
Correct. The wire size could go down to 1mm2 (actually lower) and still do the job fine.

BUT - "run the wires ON the cattle rail" .... please make sure you have excellent fusing near the battery. You really dont want something damaging the insulation and shorting out onto the metal of the cattle rail.

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Stef
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Wed Aug 17, 2016 3:01 pm

I would fish it through one of the rails with grommets at entry/exit points

Vis
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Wed Aug 17, 2016 8:52 pm

Thanx for the info.
Will do.
2011 Hilux D4D 4x4 s/c
2008 Fortuner 4x4
1993 Hilux d/c sfa

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