| pertaining to alternating electric quantities such as voltage or current, to devices operated with these, or to quantities associated with these devices
NOTE 1 – The notation "AC" is preferred in English to the notation "a.c." which is an abbreviation of "alternating current" (see IEC 60050-131).
NOTE 2 – French language uses also the expression "courant alternatif" with an appropriate preposition such as "en", "de", "à" or "pour", or only the adjective "alternatif".
NOTE 3 – For the marking of electric equipment, either the notation AC (see IEC 61293) or the graphical symbol ~ (see IEC 60417 item 5032) may be used. Example: AC 500 V or ~ 500 V.
NOTE 4 – According to ISO 31-0 and IEC 60027-1, unit names and unit symbols shall not be qualified by "AC" as an attachment. Example: UAC = 500 V is correct, U = 500 VAC or U = 500 V AC are incorrect.
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