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Inductance is less when twisted. What is done is to twist and braid many pair of Cat5 cable. Here are some examples

http://www.venhaus1.com/diycatfivecables.html

http://www.venhaus1.com/diycatfivecables.html

This twising and braid will give it Litz effects. Low inductance and reduction in effect of magnetic fields will occur.

Different companies will use different methods on their cables.

SCIDB