Rec. ITU-T K.35 (12/2020) Bonding configurations and earthing at remote electronic sites Summary History FOREWORD Introduction 1 Scope 2 References 3 Definitions 3.1 Terms defined elsewhere 3.2 Terms defined in this Recommendation 4 Abbreviations and acronyms 5 Conventions 6 Earthing network for electronic equipment enclosures (EEEs) 6.1 Earthing ring for above ground and below ground EEEs 6.2 Earthing ring for EEC 6.3 Concrete-encased earth electrode 7 a.c. power distribution 7.1 a.c. power line surge protective device 8 d.c. power distribution 9 Bonding configuration 9.1 Main earthing terminal 9.2 Interior bonding-bus 9.2.1 Ring bonding-bus for AG/EEE and BG/EEE 9.2.2 Bonding-bus for EEC 9.3 Outside-plant cable entrance 9.3.1 Location of entry ports 9.3.2 Bonding of metallic components 9.4 Equipment framework 9.5 Surge protectors on communication pairs 9.6 Metallic walls Appendix I Example of bonding configurations and earthing of EEEs by use of ring bonding-bus Appendix II Example of A.C. power line surge protective device Appendix III Example of Bonding-bus for EEC Bibliography