ISO/IEC TS 29125:2017/Amd 1:2020/Cor 1:2025

Information technology — Telecommunications cabling requirements for remote powering of terminal equipment — Amendment 1 — Technical Corrigendum 1

Technologies de l'information — Exigences de câblage des télécommunications pour téléalimentation d'équipement terminal — Amendement 1 — Rectificatif technique 1

General Information

• Status: Published
• Publication Date: 21-Dec-2025
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: 6060 - International Standard published
• Start Date: 22-Dec-2025
• Completion Date: 22-Dec-2025

Relations

• Corrects: ISO/IEC TS 29125:2017/Amd 1:2020 - Information technology — Telecommunications cabling requirements for remote powering of terminal equipment — Amendment 1
• Effective Date: 27-Dec-2025

Overview

ISO/IEC TS 29125:2017/Amd 1:2020/Cor 1:2025 addresses the telecommunications cabling requirements for the remote powering of terminal equipment. As published by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), this technical specification includes an amendment and corrigendum to clarify and update power and temperature parameters for remote power delivery through balanced twisted pair cabling. The changes in this version provide updated guidance for managing cable bundles, specifically focusing on the safe transmission of higher currents.

Key Topics

• Cabling for Remote Powering: Defines guidelines for powering devices (such as VoIP phones and IoT sensors) through telecommunications cabling infrastructure.
• Cable Bundle Current Ratings: Updates recommended current per conductor, increasing the nominal value from 1,000 mA to 2,000 mA, aligning with evolving remote powering technologies.
• Temperature Rise Management: Provides a new Table 7 detailing temperature increases in cable bundles at varying sizes and conductor diameters, helping installers assess thermal performance and safety.
• Installation Environment Considerations: Differentiates between air and conduit installation conditions, with specific temperature rise values for each scenario.
• Manufacturer Specifications: Emphasizes the importance of consulting specific cable manufacturer data in conjunction with the standard’s guidance.

Applications

ISO/IEC TS 29125 and its amendments are crucial for:

• Enterprise and Commercial Cabling Installations: Ensuring safe and efficient delivery of Power over Ethernet (PoE) and similar services to endpoints across large installations.
• Data Centers and Telecom Rooms: Managing bundled cables carrying higher currents without exceeding safe temperature limits.
• Building Automation and Smart Facilities: Supporting the infrastructure for remote powering technologies such as access controls, surveillance cameras, wireless access points, and sensors.
• Installer and Engineer Reference: Providing cable and network engineers with up-to-date guidance on bundle sizes and permissible current to avoid cable overheating and maintain network reliability.
• Equipment Manufacturers: Aligning product development with international requirements for telecommunications cabling performance and safety.

Related Standards

Organizations and professionals working with remote powering in telecommunication networks may also reference:

• ISO/IEC 11801: International standards for generic cabling in customer premises.
• IEEE 802.3 (PoE Standards): Defines Power over Ethernet requirements utilized in conjunction with structured cabling.
• IEC 60364-5-52: Electrical installation standards relating to wiring systems and their operational environments.
• ISO/IEC TR 11801-9904: Additional technical reports on remote powering environments.

Practical Value

By adhering to ISO/IEC TS 29125 and its latest amendment and corrigendum, organizations can:

• Ensure Network Safety: Avoid adverse effects of excessive temperature rise in cabling bundles, protecting both network infrastructure and powered devices.
• Support High-Power Applications: Accommodate growing demand for higher power delivery in modern intelligent buildings without compromising system longevity.
• Streamline Compliance: Satisfy regulatory and client requirements with internationally recognized best practices for remote powering cabling installations.
• Optimize Performance: Select proper cable types, bundle sizes, and installation conditions to maximize network efficiency and avoid premature cable degradation.

This updated international specification is an essential reference for the safe, reliable, and efficient deployment of remote powering solutions in modern network environments.

Standards Content (Sample)

ISO/IEC TS 29125:2017/AMD1:2020/COR1:2025 © ISO/IEC 2025
ISO/IEC TS 29125
Edition 1.0  2017-04
Information technology - Telecommunications cabling requirements
for remote powering of terminal equipment

AMENDMENT 1
CO RRI G E NDUM 1
6.4.3 Cable count within a bundle
In the third paragraph that begins "Refer to Table 7 …", replace "1 000 mA" with "2 000 mA".
Replace the existing Table 7 with the following new Table 7.
Table 7 – Temperature rise versus 1-pair cable bundle size
(2 000 mA per conductor)
Temperature rise
°C
Number 0,40 mm 0,51 mm 0,57 mm 0,65 mm 0,81 mm 1,02 mm
of cables diameter diameter diameter diameter diameter diameter
mA mA mA mA mA mA
air conduit air conduit air conduit air conduit air conduit air conduit
7 21,0 30,5 12,9 18,7 10,3 15,0 7,9 11,5 5,1 7,4 3,2 4,7
19 36,6 51,8 22,5 31,9 18,0 25,5 13,9 19,6 8,9 12,6 5,6 8,0
24 41,9 58,8 25,8 36,1 20,6 28,9 15,9 22,3 10,2 14,3 6,4 9,0
37 54,1
...