It is not jacketed, but submersible water pump wire is often twisted 
and in sizes as large as one could reasonably wish.  Here is one 
example:

http://www.deanbennett.com/submersible-pump-wire.htm

David K0LUM

At 9:37 AM -0700 4/19/10, Jim Brown wrote:
>
>Another point. It has LONG been known that twisted pair wiring minimizes
>the radiation and pickup of noise, yet we use parallel wire cable ("zip
>cord") for power wiring in our ham shacks. That's plain stupid if we care
>about noise and RF pickup! The problem is finding twisted pair cables of
>suitable size. 
>
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