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ITU-T K.50 (02/2000)

Safe limits of operating voltages and currents for telecommunication systems powered over the network

This Recommendation provides guidance on voltages and currents that may safely be used to power telecommunication systems that are part of the network. These systems use the paired-conductor cables of the network or specific power feeding cables to provide power to equipment at remote locations. This equipment and the current carrying conductors can be accessed in the energized state by service personnel without using insulated gloves or tools. These systems are not intended to be part of the subscriber's installation, and are not accessible to users of the network. They are located in the networks between different telecommunication centres and between a telecommunication centre and public network interfaces. This Recommendation covers only systems that use continuous dc powering.

Citation:	https://handle.itu.int/11.1002/1000/4913
Series title:	K series: Protection against interference
Approval date:	2000-02-25
Provisional name:	K.sov
Approval process:	TAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 5
Further details:	Patent statement(s)

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
4.3	K.50 (2018) Cor. 2 (07/2021)	In force	here	here	here
4.2	K.50 (2018) Cor. 1 (12/2020)	In force	here	here	here
4.1	K.50 (2018) Amd. 1 (06/2020)	In force	here	here	here
4.0	K.50 (2018) Err. 1 (03/2021)	In force	-	-	here
4	K.50 (01/2018)	In force	here	here	here
3	K.50 (12/2016)	Superseded	here	here	here
2	K.50 (07/2016)	Superseded	here	here	here
1	K.50 (02/2000)	Superseded	here	here	here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

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ITU-T Recommendations

ITU-T K.50 (02/2000)