1. Introduction
At the November 2008 SG 5 meeting it was agreed, and reported in SG 5 R-01, that a special group would be set up to study some issues regarding damage to equipment in the home environment. This study was initiated to resolve the problems reported in C 56 (2005 - 2008) and TD 49. At the May 2009 SG 5 meeting it was agreed that Questions 4, 5, 6, 8, 10 and 13 need to be involved and the scope of work is given in section 2 below. This group is now referred to as the “Home Networks Special Group”
2. Scope
The following tasks are within the scope of the Home Networks Special Group.
- Look at coupling mechanisms between lightning strikes and the building cabling
- Determine the waveshapes and magnitudes
- Investigate and determine reasons for equipment damage
- Establish wiring requirements, both cable characteristics and installation guidelines
- Look at solutions where bonding or installation requirements cannot be achieved
- Review resistibility requirements taking into account the above
- Investigate the use of MSPDs
- Specify the requirements for MSPDs
- Investigate coordination issues between primary protection, MSPDs and equipment. Develop solutions for coordination problems.
- Risk analysis
3. Proposed tasks
- Q4. (Phil Day and Benjamin Barlaud) Resistibility aspects. This would include determining if modified tests are required due to the many surge coupling methods within a building. The requirements of IEC 603464-4-44 may need to be considered in determining the resistibility test levels. It may be necessary to consider the possibility of SPDs on internal ports as a special requirement.
- Q5. (Célio Barbosa and Mrs. Ying Shi) Risk analysis and surges coupled to building wiring. Determine the magnitude and the source impedance of the surges for both inductive and conductive coupling for. Refer to IEC 60364-4-44 and consider the impact of compliance and non compliance. Prepare an equipment risk assessment.
- Q6. (Claude Monney and Ying Xiong) SPD installation, earthing and bonding, and other installation aspects. This would include the coordinated installation of primary and secondary protection and restrictions on wiring locations to minimise EMC problems. Include a reference to IEC 60364 in K.66 and review the impact of bonding and not bonding according to IEC 60364. Update K.66 accordingly to include a reference to IEC 60364-4-44 and amend the SPD installation, wiring, earthing and bonding requirements. May need to refer to K.44 for special resistibility requirements.
- Q8. (Ryuichi Kobayashi and Mrs. Xia Zhang) The "Home Networks" question. Determine what should be in K.74 and amend K.74 to reference other K series recommendations as required.
- Q10. (Ho-Seok OH and Zander Baptista de Araujo) provide/ determine required cable characteristics.
- Q11. (Phil Day and Zhihui Wang) For safety aspects and port classification. May need to amend K.75.
- Q13. (Gerhard Ackermann and Michael Maytum) Protection component specification, application, and EMC and transmission effects related to the use of protection components. Prepare a specification for MSPDs.
4. Leadership
This Home Networks Special Group will be managed by the Working Party 1 Chairman.
5. Participation
Participation is open to ITU-T Study Groups 5 and 15.
6. Meetings and Method of Working
The Home Networks Special Group will work electronically using the ITU-T discussion forum and with face-to-face meetings as needed at SG 5 meetings. If you want to join the discussion please subscribe to the Home Networks Special Group under
WP 1/5 A sample of this page is given below.
It will be necessary to login (top right corner). Logging in should produce the following page.
Click on “Re: Home Networks Special”.
Check the box “Check this box to subscribe to this topic”
For further information, please contact
Philip Day