IEC 61300-2-43:2014 aims at screening single-mode physical contact (PC) optical fibre connectors of an optical fibre cord or an optical fibre pigtail in terms of return loss, thus ensuring minimum return loss when the connectors, which have been screen tested by this method, are randomly mated with each other in the field. This second edition of IEC 61300-3-43 cancels and replaces the first edition published in 1999 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - revision of the scope; - revision of the procedure; - addition of measurement uncertainty into the 'Details to be specified'; - addition of a bibliography. Keywords: single-mode physical contact (PC) optical fibre connectors, return loss