Twisted-pair wires to reduce surges [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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Wrenches,

I have always heard that twisted-pair wires pick up much less induced 
current from nearby fields. We all see twisted-pair telephone and 
other audio lines designed to reduce AC hum pickup. It seems to be 
well-accepted that twisting power wires makes a circuit safer from 
lightning-induced surges. R Perez reported in Home Power long ago 
that twisting the lines was more effective than shielding, per his 
experiments.

I don't understand the principle.

I twisted some wires together for a distance of 150 feet and it was 
not easy! I could have divided it into sections and twisted it in 
opposing directions in each section, which would have made it very 
easy, but since I don't understand the principle, I couldn't assure 
that it would be effective.

Can anyone induce some understanding into my twisted mind?

Windy

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