Do I need a full size(#6) EGC for a welding outlet(50A 3-wire)installed in EMT or can I use #10AWG and go from ground screw on receptacle to box? or run #10 EGC from panel neutral bar directly to outlet ground screw? There is also some 20 A receptacle circuits in this EMT. If I use the #10 I was going to pigtail the #6 with #10 wire to outlets.I know I don't need to run EGC at all with EMT. But I would still have to go from box to outlets #12 to outlets and # 10 to welder outlet.