You can order triplexed conductors from most larger supply houses.
Or these guys:
http://www.customwireandcable.com/ There is also a direction to twist, and ratio, so doing it yourself with a large feeder is un-wise. But it is the same direction, and amount of twist as a same sized romex or MC cable.
An article on the subject:
http://www.findarticles.com/p/articles/mi_qa3726/is_200304/ai_n9218102 [This message has been edited by e57 (edited 05-01-2005).]
[This message has been edited by e57 (edited 05-01-2005).]
