Hey stv - welcome to SN dude. No idea on the answer - but there's a guy here...Knothead....who's a pretty killer rigger, and very cool guy. Maybe he'll know.
Hey, as far a I know, my rigging has never killed anyone.
As far as the lifeline wire goes, I don't think that the coast guard cares that much. And frankly, I don't care that much what the coast guard chooses to approve and what it doesn't. As if they don't have better things to do than go around approving all kinds of stuff.
For technical information about what is coast guard approved and what is not, I suggest that you consult the Sailingdog. He seems to always know this stuff.
Ya know, I probably would have been wiser to wait until tomorrow to respond to this thread.
Stephen, Seriously now. What is your question? Are you a racer? I understand that some racing rules require that uncoated wire be used for some races.
Probably 1/3 of the lifelines I make are made of bare 1/19 wire. Still, I prefer coated 7 x 7 wire.
I like the fact that you can get 5/16' diameter without the weight or the cost. Plus I just like the looks of a nice set of white lifelines. They set off the lines of a boat. But that's just personal preference.
What motivates your question?