 Care must be taken when repairing or building these larger connectors, because ground is on the outside pin and neutral is in the middle, with the far pin still being the line.Most extension cables made with 20 A stage pin connectors use 12/3 type SOOW or SJOOW cable which has three individually insulated 12 awg (American Wire Gauge) stranded conductors inside a larger jacket.The internal insulation is usually colored black (for line), white (for neutral) and green(for ground).