T tommyrice Member Jan 14, 2013 #1 does anyone know if any residential loadcenters have concentric knockouts that have been tested for bonding of 120 volt circuit raceway to panel without removing all rings to use reducing washer?[example;1/2 inch emt in 1/2,3/4 combo ko?
does anyone know if any residential loadcenters have concentric knockouts that have been tested for bonding of 120 volt circuit raceway to panel without removing all rings to use reducing washer?[example;1/2 inch emt in 1/2,3/4 combo ko?
iwire Moderator Staff member Location Massachusetts Jan 14, 2013 #2 A residential panel will be below 250 volts to ground so the concentrics do not mater.
George Stolz Moderator Staff member Location Windsor, CO NEC: 2017 Occupation Hospital Master Electrician Jan 14, 2013 #3 Agreed, and I'll add that I don't believe any are.