The IEC 60320 Appliance and Interconnection Couplers chart illustrates IEC 60320 connectors, inlets, plug connectors, and outlets in their different families. For example: IEC 60320 C13 connector and C14 inlet are in the Class I, Cold family, along with the IEC 60320 Sheet E plug connector and Sheet F outlet. The IEC 60320 C15 connector and the C16 inlet are in the Class I, Hot family.