Distribution Earthing Manual - Energex

1 Manual 00758 Version: 5 | Released: 10/08/2017 Distribution Earthing Manual Page 1 of 65 THIS DOCUMENT IS UNCONTROLLED IF PRINTED OR SAVED. PLEASE CHECK THIS IS THE LATEST VERSION BEFORE USE. Foreword SCOPE This Manual outlines the standard Energex Distribution Earthing practices for low voltage and 11kV systems and includes some guidelines for higher voltages on the overhead network ( 33kv OHEW, ABS and reclosers, transmission 110/132kV.) References to low voltage (abbreviated LV) apply to 415V systems and below. References to high voltage (abbreviated HV) apply to the 11kV Distribution system and associated equipment only.

2 Note. This Manual does not cover transmission, sub-transmission, zone and bulk supply substations Earthing . Requirements for the installation, inspection, testing and maintenance of Distribution Earthing systems are outside of the scope of this document. This information is contained in Energex Work Category Specification WCS34 Earthing Systems The Distribution Earthing philosophy in this Manual is related to Energex manuals and documents, and Australian Standards, guides and regulations as shown below: WORK PRACTICES WCS 34 - Earthing Systems WP 1076 - Earth System Testing WP 1171 - Repairs to Earthing System / Conductors MAINTENANCE POLICIES Manual 00296 - Mains Asset Maintenance Policy Standard 1125 JW Maintenance Standard for Earthing Systems Policy 1056 JW Maintenance Protocol Lines Defect Manual Substation Defect Manual DESIGN & CONSTUCTION Supply & Planning Manual OH Design Manual OH Construction Manual UG Design Manual UG Construction Manual C&I Manual Substation Design Manual QECMM

3 (Connection & Metering Manual ) QPLCM & PLDM (Public Lighting D&C Manuals) OPERATIONS SAHV (Orange Book) OS 115 Phase & MEN Voltage Investigation Energex Distribution Earthing PHILOSOPHY STANDARDS & GUIDELINES Manual 00758 - Distribution Earthing Manual + FAQ STANDARDS & LEGISLATION AS2067 Substations & high voltage installations exceeding 1kV EG-0 - Power System Earthing Guide Part 1 Electrical Safety Regulations Electrical Safety Code of Practices - Works Energex Limited Manual Manual 00758 v5 10 Aug 2017 Distribution Earthing Manual Energex Limited 2017 Page 2 of 65 Authorised By - Group Manager Engineering Standards & Technology Uncontrolled when printed

4 Disclaimer This document has been developed using information provided by Energex Construction, Planning and Design staff and as such is suitable for most situations encountered. The requirements of Australian Standards, Building Codes and all other statutory bodies are regarded as the accepted minimum requirements for the establishment of these substations. Where this document exceeds those requirements, this document is to become the accepted minimum. Energex will not accept any liability for work carried out to a superseded standard. Energex may not accept work carried out that is not in accordance with current standard requirements.

5 Energex manuals are subject to ongoing review. If conflict exists between manuals, the requirements of the most recent Manual are to be adopted. A proprietary item is any item identified by graphic representation on the drawings, or by naming one or more of the following: manufacturer, supplier, installer, trade name, brand name, catalogue or reference number, and the like. The identification of a proprietary item is a recommendation ONLY. It indicates the required properties of the item, such as the type, quality, appearance, finish, method of construction and performance.

6 More than one supplier or product is capable of meeting this Specification. An alternative/ equivalent item is permissible, provided that it meets the relevant performance criteria and is otherwise of a quality reasonably satisfactory to Energex . No claim shall arise from any rejection by Energex of an alternative/equivalent item. The acceptance of an alternative/equivalent item shall not be grounds for a variation to cost or time. When offering an alternative/equivalent item, the Contractor is to provide all available technical information, and any other relevant information requested by Energex .

7 If requested by Energex , the Contractor is to obtain and submit reports on relevant tests by an independent testing authority. Deviation Any proposed deviation from this document must be submitted to Energex in writing with full descriptions and details for approval before it is implemented. Allowance should be made to ensure Energex is provided with sufficient time for full and in-depth consultation and deliberation. Interpretation In the event that any user of this Manual considers the content uncertain, ambiguous or otherwise in need of interpretation, the user may request Energex to clarify the provision.

8 Should further review be required, the provisions of the previous clause Deviation will need to be followed. Updates & Subscription When downloaded or printed, this document is uncontrolled. This document is subject to amendment by Energex at any time. Note: Users are responsible for ensuring they are using the latest information. Energex Limited Manual Manual 00758 v5 10 Aug 2017 Energex Limited 2017 Uncontrolled when printed Page 3 of 65 Amendment Records Version Date Description 5 21/06/17 Modified: Foreword Added Section works around 110/132kV towers Added Appendix 2 Probabilistic Design to AS2067 4 14/08/15 Modified.

9 Section Earth on LV cable guard not required if installed in conduit Section change pit type from to to make consistent with OCDM Appendix 1 Added clearances for DT on conductive poles consistent with OCDM (was missing on last release) 3 03/03/2014 Added: Cover Page added diagram to show other Energex Manual and documents related to Distribution Earthing . Added Disclaimer. Design Objective added, partly taken from old Section 2. Section 8 Streetlight made consistent with the Public Lighting Design Manual . Section 9 Telstra & Optus Plants consistent with ODM Sec9 Section 10 Queensland Rail Traction Earth.

10 Section 11 Customer Installation Earthing partly taken from FAQ. Section 12 Mitigation measures. Appendix 1 - Consideration of EPR (Telstra separation table). Appendix 2 Consideration of LFI (Telstra). Modified: Amendment Records moved to front of the document. Updated department and document names. Notes added Added explanation on the basis of CMEN requirement (AS2067) Minor clarification on transformer neutral which requires 10ohms. - Telstra plants with remote earth have been moved to SWER - Figure 8 - revised with correct minimum clearances.