INDUSTRIAL CONNECTOR SETS AND INTERCONNECT COMPONENTS TO BE USED IN OPTICAL FIBRE CONTROL AND COMMUNICATION SYSTEMS - PRODUCT SPECIFICATIONS - PART 3-1: TYPE ODVA APC TERMINATED ON EN 60793-2-50 CATEGORY B1.1 AND B1.3 SINGLEMODE FIBRE TO MEET THE REQUIREMENTS OF CATEGORY 1 (INDUSTRIAL ENVIRONMENTS) AS SPECIFIED IN EN 50173-1 AND IEC 61753-1-3