Earthing/Bonding Networks for Telecommunication Undergoing Shakeup

The publication of the international standard ISO/IEC 30129 INFORMATION TECHNOLOGY – TELECOMMUNICATIONS BONDING NETWORKS FOR BUILDINGS AND OTHER STRUCTURES and the upcoming revision of AS/CA S009 INSTALLATION REQUIREMENTS FOR CUSTOMER CABLING (WIRING RULES), will mean the earthing/bonding requirements associated with telecommunication cabling systems within customer’s premises are likely to be substantially different from what we currently have.

Earthing (called Grounding in some countries) in simple terms, is a conductive pathway by which a circuit or equipment is electrically connected to the earth.

Bonding in simple terms, is the permanent jointing of metallic parts into an electrically conductive path in a manner which assures electrical continuity (to earth).

The TRC system that has previously been utilised for low noise earth to PABX’s is likely be replaced/enhanced with a preference to the more effective Mesh Bonding Network earthing system.

ISO/IEC 30129 is likely to be picked up as a direct text adoption by Australian/New Zealand Standards with the intent to minimise the risk to the correct function of communications equipment and interconnecting cabling from electrical hazards and provide the telecommunications installation in part, a reliable signal reference which may improve immunity from electromagnetic interference (EMI).

While the scope for the revision of changes to AS/CA S009 is yet to be finalised it is likely, as ISO/IEC 30129 is an international standard, its requirement will form part of the consideration when reviewing AS/CA S009.

Earthing/bonding impacts the effectiveness of screen cabling, impacts on PoE delivery and may well effect network reliability.

It is recommended that when specifying earthing and bonding associated with telecommunication cabling within customer premises that;

  • ISO/IEC 30129 be taken into account for earthing and bonding systems for telecommunications.
  • The cable system vendor earthing and bonding requirements for their shielded system be specified as a requirement.
  • Conformance to AS/NZS 3000 and AS/CA S009 is specified, if applicable.

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