Shielding factors for lightning protection |
|
Recommendation ITU-T K.101 contains the calculation procedure for the shielding factors used in Recommendations ITUT K.46, ITU-T K.47, ITU-T K.56 and ITU-T K.97, and it is intended to:
1) provide the rationale for the shielding factor approximate formulas or values contained in the aforementioned Recommendations;
2) allow a more precise calculation of the shielding factors, by using the equations provided in this Recommendation.
The shielding factors considered in this Recommendation refer to:
• that of the lightning current distribution in a telecommunication tower, i.e., that of the tower (αT) as per Recommendations ITUT K.56 and ITU-T K.97;
• that of the lightning current distribution among several conductors placed in a cable ladder, i.e., that of the feeder tray (αF) as per Recommendations ITUT K.56 and ITU-T K.97;
• that provided by the cable tray (β) as per Recommendation ITUT K.56;
• that of parallel conductors (η) as per Recommendation ITUT K.47;
• that of refraction (δ) due to the earthing connection of a telecommunication cable, as per Recommendation ITUT K.46;
• that provided by a telecommunication cable having a metallic sheath (shield) (η) as per Recommendation ITUT K.46. |
|
|
|
Ed. |
ITU-T Recommendation |
Status |
Summary |
Table of Contents |
Download |
1
|
K.101 (12/2014)
|
In force
|
here
|
here
|
here
|
|
ITU-T Supplement
|
Title
|
Status
|
Summary
|
Table of contents
|
Download
|
K Suppl. 3 (10/2015)
|
ITU-T K.20, K.21, K.45, K.82 – Additional criteria to protect telecommunication cabling during a power cross event
|
In force
|
here
|
here
|
here
|
K Suppl. 8 (11/2017)
|
Resistibility analysis of 5G systems
|
In force
|
here
|
here
|
here
|
K Suppl. 9 (05/2019)
|
5G technology and human exposure to radiofrequency electromagnetic fields
|
In force
|
here
|
here
|
here
|
K Suppl. 10 (11/2017)
|
Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems
|
In force
|
here
|
here
|
here
|
K Suppl. 13 (12/2021)
|
Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use
|
In force
|
here
|
here
|
here
|
K Suppl. 14 (09/2019)
|
The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment
|
In force
|
here
|
here
|
here
|
K Suppl. 16 (10/2022)
|
Electromagnetic field compliance assessments for 5G wireless networks
|
In force
|
here
|
here
|
here
|
K Suppl. 19 (09/2019)
|
Electromagnetic field (EMF) strength inside underground railway trains
|
In force
|
here
|
here
|
here
|
K Suppl. 29 (07/2022)
|
Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology
|
In force
|
here
|
here
|
here
|
Title |
Approved on |
Download |
Mitigation measures for telecommunication installations – Chapter 10
|
2006
|
here
|
Mitigation measures for telecommunication installations
|
2004
|
here
|
Earthing and bonding
|
2003
|
here
|
Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety
|
2002
|
here
|
Earthing of telecommunication installations
|
1976
|
here
|
|