IEC 60320-2-1 pdf download.Appliance couplers for household and similar general purposes 1 Scope Replacement: This part of IEC 60320 is applicable to special purpose appliance couplers for household sewing machines. These sewing machine couplers are for a.c. only and have a rated voltage not exceeding 250 V and a rated current not exceeding 2,5 A. The sewing machine couplers may...