X19, X20, X21, X22, X23, X24, X25, X26, X27, X28, X29, X30, X31, X32, X33, X34, X35, X36, X37, X38
IEC 62321-1:2013 IEC 62321-3-1:2013IEC 62321-4:2017 IEC 62321-5:2013IEC 62321:6-2015 IEC 62321-7-1:2015IEC 62321-7-2:2017 IEC 62321-8:2017