This part of IEC 61753 contains the minimum test and measurement requirements and severities
which a fibre optic isolator as specified by IEC 61202-1 should satisfy in order to be categorized
as meeting the requirements of isolators used in controlled environments as specified in
IEC 61753-1. The requirements cover non-connectorized single-mode fibre optic pigtailed
isolators for category C used in controlled environments.