IEC 61753-058-2:2013 contains the minimum initial test and measurement requirements and severities which an optical power limiter needs to satisfy in order to be categorized as meeting the requirements of single mode fibre pigtailed style optical power limiter used in controlled environments. Optical performance specified in this standard relates to in-line type configuration power limiters only. Keywords: initial test and measurement requirements, single mode fibre pigtailed style optical power limiter used in controlled environments.