IEC 61753-022-2:2012 contains the minimum requirements and severities which a fibre optic connector terminated on multimode fibre must satisfy in order to be categorized as meeting the IEC standard category C - Controlled Environment, as defined in Annex A of IEC 61753-1:2007. This second edition cancels and replaces the first edition, published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: reconsideration of test requirements and details.Keywords: fibre optic connector, multimode fibre, category C