BS IEC 62873-3-1:2016

1   Scope This part of IEC 62873 applies to RCDs equipped with screwless terminals, for current not exceeding 20 A primarily suitable for connecting unprepared (see 3.5) copper conductors of cross-section up to 4 mm 2 . This part of IEC 62873 cannot be used alone but it is intended to be applied together with an RCD product standard (IEC 61008‑1 or IEC 61009‑1) if an RCD is equipped with screwless terminals.

    NOTE  In AT, CZ, DK, NL, NO, PO, PT and CH, the upper limit of current for use of screwless
     terminals is 16 A. 

In this part of [IEC 62873](/search?q=IEC%C2%A062873), screwless terminals are referred to as terminals and copper conductors are referred
  to as conductors.