WIRE CALCS [RE-wrenches]

[Hugh Piggott]

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The nice thing about metric wire sizes is that you can calculate the 
volt drop in your head most of the time.  Or at least near enough, 
given that it depends pretty heavily on temperature anyway.

At around ambient temperature a 2-way 1 sqmm cable has resistance 1 
ohm for each 28 metres.  I often use 30 metres in rough calcs.  For 
example 100 metres wire run (one way) 10 sqmm would have total 
resistance (both wires) 0.36 ohms.  If you are pumping 4 amps down it 
then the volt drop will be 1.4 volts.

There must be a similar trick with AWG, given that it does follow a 
crazy logarithmic logic (doubling with every 3 wires sizes).
-- 
Hugh Piggott

Scoraig Wind Electric
http://www.scoraigwind.co.uk


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