whats the risk? was doing some crawl space replacement of K&T circuit, as it was the type k's every 8 feet on bottom of joists and beams, evidence of rat infestation and needing some heat ducts replaced, tried to correct polarity on natural k&t ins. but circuit blew when I hooked up to breaker so there is a short down stream of black to earth, or possibly combined returns in k&t system works ok as originally connected....tried arc fault it wouldnt stay on....been like that for 80 years? Is it worth the needle in a hay stack isolating of the feeds up to find the short? Chris
Last edited by crselectric; 04/08/10 05:37 PM.