...Generally,(2)wires under one lug is a violation,unless that lug/breaker is listed for such..as far as I know,Square D,are the only breakers whose lugs are listed for (2)wires,..but 2/0?? how did they fit (2) of them under(1)lug?? sounds fishy to me...Good Luck!!
Russ

[This message has been edited by Attic Rat (edited 03-24-2005).]

.."if it ain't fixed,don't break it...call a Licensed Electrician"