| designation used to differentiate one contact from another
NOTE – The contact size may be denoted by one of the following systems:
a) numbering system: assigned numbers used to denote the size of the contact and its related conductor accommodation,
b) current rating system: the related current-carrying capacity is used to denote the size of the contact,
c) cross-sectional area system: reference is made to the cross-sectional area of the maximum conductor accommodation to denote the size of the contact.