... ``,`,`,,,``````,,``,,``,,,,`,-`-`,,`,,`,`,,` 61 131 -2 O IEC: 20 03( E) -9- INTRODUCTION This part of IEC 61 131 constitutes Part 2 of a series of standards on programmable controllers and the associated peripherals ... 12.2 12 .3 Single-fault condition test - General 1 03 13 Safety routine tests 104 13. 1 Dielectric withstand test 104 13. 2 Dielectric withstand verification test 105 13. 3 14 Safety ... ``,`,`,,,``````,,``,,``,,,,`,-`-`,,`,,`,`,,` -4- 61 131 - 2 O IEC: 20 03( E) 11.9 Provisions for protective earthing 91 11 . 11 Switching devices 93 11 . 12 Components 93 1 1 . 13 Battery requirements ...