Overview of ITU-T SG5 Work on Damage protection and safety

1. Overview of ITU-T SG5 Work on Damage protection and safety Guy-Michel KOUAKOUChairman of Study Group 5 Regional Group for Africa (SG5 RG-AFR) Vice-Chair SG5

2. Terms of Reference Study Group 5 is responsible for studies: • on ICT environmental aspects of electromagnetic phenomena and climate change; • related to electromagnetic compatibility (EMC), to safety and to health effects connected with electromagnetic fields produced by telecommunication installations and devices, including cellular phones. Study Group 5 is lead SG for: • Environment and climate change • Electromagnetic compatibility and electromagnetic effects

3. ITU-T Study Group 5 7 Questions WP1/5 Damage prevention and safety WP3/5 ICT and climate change 5 Questions WP2/5 Electromagnetic fields: emission, immunity and human exposure 6 Questions

4. Working Party 1 (WP1/5) Work areas: • Q1/5 - Copper cables, networks and fibre-optic connection hardware for broadband access • Q2/5 - Protective components and assemblies • Q3/5 - Interference to telecommunication networks due to power systems and electrified railway systems • Q4/5 - Resistibility and safety in telecommunications • Q5/5 - Lightning protection and earthing of telecommunication systems WP1/5 Damage prevention and safety 5 Questions

5. WP1/5: damage prevention and safety Highlights on deliverables: • ITU-T K.12 - Characteristics of gas discharge tubes for the protection of telecommunications installations • ITU-T K.21 - Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents • ITU-T K.27 - Bonding configurations and earthing inside a telecommunication building • ITU-T K.56 - Protection of radio base stations against lightning discharges • Guide on the Use of the Overvoltage Resistibility Recommendations

6. Question 5/5 Lightning protection and earthing of telecommunication systems Main Study Area: • Protection of fixed telecommunications lines, including the lines made of symmetric conductors, coaxial cables and non-metal-free fibre-optic cables, as well as lines used for remote power feeding of telecommunication equipment; • Protection of mobile and wireless systems, in particular radio base stations which very often have their antennas installed in high structures exposed to lightning discharges; • Protection of telecommunication stations (central office), in particular those that make part of the network’s backbone and, therefore, require a high reliability; • Utilization of the data from lightning location systems (LLS) to optimize the network protection; • Protection of users of telecommunications services from the dangerous effects of lightning discharges; • Bonding configurations and earthing of telecommunication installations, including earthing of power feeding systems in co-located environment; • Requirements for earthing and equipotential bonding under transient conditions, as those caused by the fast raising currents associated with subsequent lightning return strokes; • Maintenance methods of bonding configurations and earthing.

7. Question 5/5 Lightning protection and earthing of telecommunication systems Main Tasks: • New Recommendation on the protection of installations at the neighbourhood of telecommunication towers; • New Recommendation on the use of the data from lightning location system (LLS) for network protection; • Lightning protection and earthing total solution for Radio Base station site ; • New Recommendation on the assessment of the conformance of Radio Base Station regarding lightning protection and earthing • Lightning Protection of the Dedicated Transformer for Radio Base Station • Lightning protection and earthing of miniature wireless base station

8. Highlight on K.56 • ITU-T K.56 presents the techniques applied to a telecommunication radio base station in order to protect it against lightning discharges. • The need of protection is obtained from the methodology contained in IEC 62305-2, which is used to determine the relevant lightning protection level (LPL) for the installation. The protection techniques for the external area cover the lightning protection system (LPS), bonding procedures, earthing and the installation of surge protective devices (SPDs) at the power meter station. • The protection techniques for the equipment building cover the feeder and lighting cables, the electric power conductors, the telecommunication cabling and the earthing/bonding procedures applied to cable trays and equipment frames.

9. Deliverable under study: K.arcb • ITU-T K.arcb provides the technical requirements and measurement methods to assess the validity and reliability of the lightning protection and earthing system of radio base stations (RBSs). It focuses on the quality controlling in the process of construction, acceptance, daily inspection and maintenance. The total solution for the lightning protection of RBSs should refer to [ITU-T K.56], [ITU-T K.97] [ITU-T K.TOT] and other relative Recommendations;

10. Additional information • ITU-T/SG5 “Environment & Climate Change”itu.int/go/tsg5 • ITU-T/SG5 Series K Recommendations (free of charge)itu.int/ITU-T/recommendations/index_sg.aspx?sg=5 THANK YOU! tsbsg5@itu.int