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What wire for spotlights ?
- happypig
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- happypig
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- Dutchjimny
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- Dutchjimny
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- Smoggy
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30 Oct 2012 20:13 #51694
by Smoggy
You must be a sparky too Dutchjimny, those resistivity formulaes remind me of my old college days when I did my apprenticeship day release
Replied by Smoggy on topic What wire for spotlights ?
Dutchjimny wrote: How to calculate core diameter:
D = I * sR * L / (Vbegin - Vend)
D = Diameter; I = Amps.; sR= resistance Copper: 0.0175Ω; L = cable length; (Vbegin - Vend) = max. allowed Voltage Drop
Example: 100W appliance/12V circuit/20m cable length/max. Voltage Drop 0.6V 100W/12V = 8.3Amp.
D mm2 = 8.3Ax0.0175Ωx20meters/0.6V
Outcome is 4.8mm2 minimum, so use a 6mm2 cable.
It will be a very thick cable...
You must be a sparky too Dutchjimny, those resistivity formulaes remind me of my old college days when I did my apprenticeship day release
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- Dutchjimny
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30 Oct 2012 20:23 #51698
by Dutchjimny
Replied by Dutchjimny on topic What wire for spotlights ?
Its good to be a sparky 
Martin better save this formula on the general section its very simple and can help people calculate their wiring diameter very easily so no jimnys get burned
Martin better save this formula on the general section its very simple and can help people calculate their wiring diameter very easily so no jimnys get burned
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