ISO/IEC 30129:2015/AMD2:2025

Amendment 2 - Information technology - Telecommunications bonding networks for buildings and other structures

General Information

• Status: Published
• Publication Date: 15-Jul-2025
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: WG 3 - ISO/IEC JTC 1/SC 25/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 16-Jul-2025
• Completion Date: 08-Aug-2025

Relations

• Amends: ISO/IEC 30129:2015 - Information technology - Telecommunications bonding networks for buildings and other structures
• Effective Date: 05-Sep-2023

Overview

ISO/IEC 30129:2015/AMD2:2025 (Amendment 2) updates the international standard for telecommunications bonding networks in buildings and other structures. Prepared by JTC 1/SC 25, the amendment clarifies scope and terminology, adds a formal definition for bonding network (BN), updates normative references, and refines design and installation requirements for bonding conductors used to mitigate electromagnetic interference (EMI) and stabilize signal reference for telecom systems.

Key topics and technical requirements

• Purpose: specify requirements and recommendations for design and installation of connections (bonds) between electrically conductive elements to
  • minimise d.c. and a.c. potential differences caused by electromagnetic disturbance and transients, and
  • provide a reliable signal reference to improve immunity from EMI.
• Bonding network types: identifies four general types - star, ring, local mesh, mesh - and notes increasing suitability in that order (star → ring → local mesh → mesh).
• Installation rules:
  • Bonding conductors must meet applicable minimum bend radius and shall not be coiled or doubled back.
  • Bonding connectors and fastenings shall provide and maintain a d.c. contact resistance of ≤ 100 mΩ.
  • Conductors for Telecommunications Bonding Backbone (TBB) should be installed without splices where possible; splices must be minimised and accessible.
• Impedance control formulas: several clauses standardize spacing/quantity calculations using expressions such as n = (l/6) rounded down to the nearest integer (replacing previous ROUNDUP formulas) for Rack Bonding Conductors (RBC), TBB, mesh bonding conductors, etc.
• Documentation: all bonding connections must be documented (drawings, schematics, termination details, photos). Consider electronic Automated Infrastructure Management (AIM) systems compliant with ISO/IEC 18598 for complex installations.

Practical applications

• Preventing equipment malfunction and improving EMI immunity in:
  • commercial offices, data centers, telecom exchange sites, and access provider premises
  • buildings undergoing construction or refurbishment where IT/telecom equipment will be installed
• Design and verification of building bonding schemes (PBB, TBB, BBC, RBC, TEBC) to support structured cabling, rack installations, and fiber/metallic network interfaces.
• Maintenance and audit processes to sustain telecom bonding performance over the life of a building.

Who should use this standard

• Telecom and structured cabling designers and consultants
• Facility and electrical engineers, data center architects
• Cabling installers and commissioning teams
• Standards compliance officers and asset managers

Related standards

• ISO/IEC 30129 (base publication)
• IEC 62368-1 (safety for audio/video, ICT equipment) - replaces IEC 60950-1 reference
• ISO/IEC 14763-2 (cabling installation)
• ISO/IEC 11801 (generic cabling)
• ISO/IEC 18598 (Automated Infrastructure Management - AIM)

Keywords: telecommunications bonding networks, bonding conductors, mesh bonding network, EMI mitigation, telecom installation, TBB, PBB, rack bonding conductor.

Standards Content (Sample)

ISO/IEC 30129
Edition 1.0 2025-07
INTERNATIONAL
STANDARD
AMENDMENT 2
Information technology - Telecommunications bonding networks for buildings
and other structures
ICS 35.200  ISBN 978-2-8327-0563-6

ISO/IEC 30129:2015-10/AMD2:2025-07(en)

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Information technology -
Telecommunications bonding networks
for buildings and other structures

AMENDMENT 2
FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental,
in liaison with ISO and IEC, also take part in the work.
2) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC and ISO National bodies.
3) IEC and ISO documents have the form of recommendations for international use and are accepted by IEC and
ISO National bodies in that sense. While all reasonable efforts are made to ensure that the technical content of
IEC and ISO documents is accurate, IEC and ISO cannot be held responsible for the way in which they are used
or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC and ISO National bodies undertake to apply IEC and
ISO documents transparently to the maximum extent possible in their national and regional publications. Any
divergence between any IEC and ISO document and the corresponding national or regional publication shall be
clearly indicated in the latter.
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assessment services and, in some areas, access to IEC and ISO marks of conformity. IEC and ISO are not
responsible for any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this document.
7) No liability shall attach to IEC and ISO or their directors, employees, servants or agents including individual
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property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including
legal fees) and expenses arising out of the publication, use of, or reliance upon, this ISO/IEC document or any
other IEC and ISO documents.
8) Attention is drawn to the Normative references cited in this document. Use of the referenced publications is
indispensable for the correct application of this document.
9) IEC and ISO draw attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC and ISO take no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, IEC and ISO had not received notice of
(a) patent(s), which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
https://patents.iec.ch and www.iso.org/patents. IEC and ISO shall not be held responsible for identifying any or
all such patent rights.
Amendment 2 to ISO/IEC 30129:2015 has been prepared by subcommittee 25: Interconnection
of information technology equipment, of ISO/IEC joint technical committee 1: Information
technology.
The text of this Amendment is based on the following documents:
Draft Report on voting
JTC1-SC25/3308/FDIS JTC1-SC25/3325/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1, and the ISO/IEC Directives, JTC 1 Supplement
available at www.iec.ch/members_experts/refdocs and www.iso.org/directives.

___________
INTRODUCTION
Replace the first paragraph with the following:
This International Standard specifies requirements and recommendations for the design and
installation of connections (bonds) between various electrically conductive elements in
buildings and other structures, during their construction or refurbishment, in which information
or telecommunications technology equipment is intended to be installed in order to
Replace Figure 1 with the following figure:

Figure 1 – Schematic relationship between ISO/IEC 30129
and other relevant standards
1 Scope
Replace the first paragraph including the list with the following:
This International Standard specifies requirements and recommendations for the design and
installation of connections (bonds) between various electrically conductive elements in
buildings and other structures, during their construction or refurbishment, in which information
or telecommunications technology equipment is intended to be installed in order to
a) minimise the d.c. and a.c. potential differences in telecommunications networks due to
electromagnetic disturbance, power transients, and other causes to reduce the risk of
malfunction of equipment, and
b) provide the telecommunications installation with a reliable signal reference – which
improves immunity from electromagnetic interference (EMI).
2 Normative references
Replace the IEC 60950-1 reference with the following new reference:
IEC 62368-1, Audio/video, information and
...