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ENA_ER_G81_Part_3_Issue_1_Amendment_1_(09-01-08)
BrowseInterestsStay InformedCareerPersonal GrowthFiction & BiographiesHealth & FitnessLifestyleCultureBrowse byBooksAudiobooksNews & MagazinesSheet MusicBrowse allUploadSign inJoinPRODUCED BY THE ENGINEERING DIRECTORATE OF THE ENERGY NETWORKS ASSOCIATIONEngineering Recommendation G81 - Part 3: Installation Records
Issue 1 Amendment 1 – January 2008
. Advice should be taken from an appropriately qualified engineer on the suitability of this document for any other purpose. without the prior written consent of Energy Networks Association. Specific enquiries concerning this document should be addressed to: Engineering Directorate Energy Networks Association 18 Stanhope Place Marble Arch London W2 2HH This document has been prepared for use by members of the Energy Networks Association to take account of the conditions which apply to them. mechanical.© 2008 Energy Networks Association All rights reserved. recording or otherwise. stored in a retrieval system or transmitted in any form or by any means. No part of this publication may be reproduced. photocopying.
© Energy Networks Association 2008 Engineering Recommendation G81 Part 3 Issue 1
Reference to Electricity and Pipe Line Works (assessment of environmental effects) Regulations removed. Reference to Electricity Works (Environmental Impact Assessment)(England and Wales) Regulations changed to refer to the document amended in 2007 Reference to Electricity Safety Quality and Continuity Regulations 2002 changed to refer to document amended in 2006.
.............................................................................................................................. 9 7.........................................4 Health & Safety Executive (HSE) publications .........................3 Plant....................15
APPENDIX A: TEST REQUIREMENTS .occupancy dwellings .......................................................................................................1 General ........ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 2 of 17
CONTENTS 1 2 3 BACKGROUND ..... 4 3........................................................................................................................................................................................................... 3 REFERENCES .................................................................................................................. 5 3........................................ 4 3.................................. 4 3.......14 RECORDS .16 APPENDIX B: HOST DLH REQUIREMENTS – Typical Example Only .................................4 Service entries........................................................................................................................17
.................................................................5 Pooling & Settlement Agreement ..........3 National Joint Utilities Group (NJUG) publications ............................2 Underground cables ....... 9 7............11 7....6 Work in contaminated land......14 TESTS................................................ 9 7........................................................5 Multi................................................................................ 4 3...................................................12 7.............7 British Standards ...................6 Ofgem approved publications............................................ 6 DEFINITIONS and ABBREVIATIONS .................................................................. 8 INTRODUCTION ......... 5 3................................................................................................................................ 5 3............................................................................1 Energy Networks Association / ESI publications.................................................................................................................................................. 3 SCOPE .............2 Energy Networks Association Technical Specifications (ENATS) ................................................. 5 LEGISLATION...........11 7............ 9 INSTALLATION........................................................................................
ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 3 of 17
BACKGROUND a. This document was agreed by the Ofgem Electricity Connections Steering Group on March 8th 2004. It is one of the following suite of documents governing this work: • • • • • Adoption Agreement Design and Planning framework Materials Specifications framework Installation and Records framework Underground unmetered connections framework
c. NB This suite of documents applies only to NEW installations and is not to be applied retrospectively. In the event that it is not possible to resolve the question with the Host DLH. d. Ofgem. for example equipment ratings. This document sets the installation and record requirements for low voltage electricity underground cable networks and associated new HV/LV distribution substations for housing developments undertaken under the Ofgem Competition in Connections regime.
. b. It is intended to set out or make reference to installation requirements which have to be met for a Host DLH to adopt contested LV networks and associated. This revision extends the scope to include previously developed (“brownfield”) sites as well as the “Greenfield” sites previously covered. London SW1P 3GE. e. b.
SCOPE a. abridge or override any legislation referred to within this document. This document must be read in conjunction with these documents as some issues. are dependent both on specification and the manner in which their use is designed or installed. If there are queries about this document please discuss them with the Host DLH in whose area it is proposed that work is to be undertaken. new HV/LV distribution substations for housing developments. 9 Millbank. This document is intended to supplement but not amend. please seek advice from Connections Policy Team.
testing and maintenance of main earthing systems in substations.1
Energy Networks Association / ESI publications ENA documents can be obtained via the ENA web site: www.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 4 of 17
This document makes reference to the documents listed below.energynetworks.
. which must be complied with unless otherwise agreed in writing with the DLH.org Engineering Recommendations (ER) G12/3 Requirements for the application of protective multiple earthing to low voltage networks Leakage of flammable gases recommendations Model code of practice covering electrical safety in the planning installation commissioning and maintenance of public lighting and other street furniture
G17/3 G39/1
3. installation. The latest editions of these documents including all addenda and revisions shall apply unless otherwise agreed with the DLH.2
Energy Networks Association Technical Specifications (ENATS) ENATS 12-03 Outdoor meter cupboards ENATS 12-23 Polythene protection tape for buried electricity supply cable ENATS 12-24 Plastic ducts for buried electric cable ENATS 37-2 LV distribution fuseboards
ENATS 41-24 Guidelines for the design.3
National Joint Utilities Group (NJUG) publications NJUG 4 NJUG 6 NJUG 7 NJUG 10 The identification of small buried mains and services~ Service entries for new dwellings on residential estates Recommended positioning of Utilities apparatus for new work on new developments and in existing streets Guidelines for the planning. installation and maintenance of utility services in proximity to trees.
Pooling & Settlement Agreement Agreed Procedure – Unmetered Supplies Registered in PRS Vol 5 AP 520 Issue 3 now BSCP 520
Health & Safety Executive (HSE) publications HS (G) 47 GS 6 Avoiding danger from underground services Avoidance of danger from overhead electric power lines
Ofgem approved publications Distribution Code Distribution Licence Conditions
3.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 5 of 17
British Standards BS 7671 Requirements for Electrical Installations (IEE Wiring Regs 16th edition)
Safety and Welfare Regulations
. and the Distribution Code which is given legal authority by the provisions of the Public Electricity Supply Licence issued under it. The following is a list of some of the relevant legislation: Electricity Act 1989 as amended by the Utilities Act 2000. Safety & Welfare Regulations Workplace Health.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 6 of 17
All requirements of all relevant legislation must be met. Electricity Safety Quality and Continuity Regulations 2002 as amended 2006 (and associated Guidance issued by DTI) Electricity at Work Regulations 1989 The Building Regulations The New Roads and Street Works Act and all related Codes of Practice and Specifications (note draft Records Code of Practice has been issued for comment in May 2001) Town & Country Planning Act – General Development Order 1990 Construction (Design Management) Regulations 1994 The Management of Health & Safety at Work Regulations 1999 Health & Safety at Work etc Act 1974 Provision and Use of Work Equipment Regulations 1998 Control of Substances Hazardous to Health Regulations 1999 Contaminated Land (England) Regulations 2000 Asbestos at Work Regulations 2002 Manual Handling Operations Regulations 1992 Noise at Work Regulations 1989 Confined spaces regulations 1997 Lifting Operations and Lifting Equipment Regulations 1998 Construction Health.
ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 7 of 17
EC Utilities Directive 93/38/EEC and UK SI 1996 No 2911 The Ancient Monuments and Archaeological Areas Act 1979 Land Drainage Act 1991 The Electricity Works (Environmental Impact Assessment) (England & Wales) Regulations 2000 (as amended 2007) Wildlife and Countryside Act 1981 Water Resources Act 1991 EU Habitats Directive 92/43/EEC – Special Areas of Conservation
as amended 2006 (and their associated Guidance documents issued by DTI) Harmonised Document (IEC standard adopted as a European reference document) The DLH in whose licensed area (DSA) the works are to take place
DSA EA
ENATS ENA ESQCRs
Host DLH
Housing A development consisting of domestic dwellings development HSE IEC NRSWA PSCC Health & Safety Executive International Electrotechnical Commission New Roads and Street Works Act Prospective Short Circuit Current
. 2001 Distribution Service Area – the service area of a DLH Electricity Association ( replaced by ENA for Networks issues post Oct 2003 ) Energy Networks Association Technical Specification Energy Networks Association Electricity Safety Quality and Continuity Regulations 2002.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 8 of 17
DEFINITIONS AND ABBREVIATIONS OFGEM ADMD BSI BS BS EN CNE Applicant DLH Office of Gas and Electricity Markets After Diversity Maximum Demand British Standards Institution British Standard A European Standard adopted as a British Standard Combined neutral and earth (of cable construction) The Company wishing to undertake the contestable work Distribution Licence Holder – defined in Standard Licence Conditions for Electricity Distributors. issued under the Utilities Act and effective from 1st Sept.
This framework describes installation test and records requirements for low voltage underground cable networks and associated.
7. of differences in: • • • substation specification environment and impact on ratings. Cable laying depths shall be as NJUG 7.
7. it will be stated in the Appendices to this Technical Framework document. Where a deviation from this framework is identified. for example. insulation.1
General a. all applicable legislation and the details in this section.2
Underground cables a. and shall be recorded. corrosion etc compatibility with existing equipment
c. There shall be no material change to routes (to the extent that it affects design criteria) detailed in previously submitted plans unless otherwise agreed in writing with the Host DLH and other interested parties. b. new. The installation shall be such as to permit future live working on the asset by the DLH. unless otherwise agreed. The installation of all plant and equipment to be adopted by the Host DLH shall meet the requirements of the listed references. b.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 9 of 17
a. b. c. All plant and equipment installed shall comply with the requirements of the “Materials specification framework” document. It must be noted that ratings will be influenced by the installation arrangement and reference shall be made to the “Design and planning requirements framework” document regarding equipment ratings. This document is subject to some local variation between DLHs because. HV/LV distribution substations for housing developments.
1. A cable stocking. Duct mouths shall be sealed to prevent ingress of water. Ducts shall be suitably spaced to avoid congestion at either end to facilitate future jointing. fitted with a swivel. f. g. Earth conductors and rods shall be laid in accordance with the previously submitted plans. j. If a winch is employed to pull the cable. the bottom of the trench shall rise or fall gradually. After laying the cable shall be backfilled with suitable graded fine fill material to tape level and the correct marker tape laid. LV Mains joints shall be made 'Colour True' or R . The cable shall be correctly spaced from other cables and other utility services. h. in compliance with the ESQCRs and Host DLH policy. Spare ducts shall be installed by the Applicant at positions agreed with the Host DLH. Wherever possible. Cable laying shall only take place when the ambient temperature is above 0º C and has been above this temperature for the previous 24 hours. unless agreed otherwise with the Host DLH. Where a change of level is necessary. Alternatively. special precautions shall be taken to maintain cables above this temperature to avoid risk of damage during handling. cables should be laid by hand. rollers and skid plates shall be used in the trench to ensure that the cable does not touch the ground during pulling. i. d. Cables shall not be bent further than their minimum bending radius.3. in accordance with NJUG specifications.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 10 of 17
c. sharp stones. Checks shall be made that all installed ducts are undamaged and are not obstructed (including any ducts laid as spare for future use). DLHs are currently seeking to establish programmes with their cable suppliers for the managed introduction of the new European
. Note should be taken of the requirements of ESQC Regulation 9 (2) (a) on the need for earths at the remote end of the main. B . Ducts shall be laid at least 300 mm below the carriageway construction and shall extend to the outer extremities of the kerb haunchings. noxious or explosive liquids or gases. m. Trenches shall be prepared so that the bottom of the trench is free of rubble. flint etc. Before backfilling a visual inspection shall be carried out to ensure the cable is free from damage. during each stage of the energisation programme.2. l. Jointing practice shall be in accordance with a specification agreed with the Host DLH. must be used to connect the bond to the cable and a dynamometer used to check that the maximum pulling tension for the cable is not exceeded.. e. k. and an adequate layer of stone dust or other suitable bedding has been laid. Jointing materials comply with Host DLH specification or an agreed equivalent. Y .
This should be discussed with the Host DLH.
7. Electricity Safety Quality and Continuity Regulations and associated Guidance security requirements. This may include such issues as layout. If alternative arrangements are considered the following shall be taken into account: • • The air temperature surrounding the cut out must not exceed 30°C. Plant delivered from manufacturers shall be unloaded and stored in a way that avoids damage or exposure. The Applicant must provide a Completion Certificate. Where a DLH employs such a system. enclosure type. d. together with copies of the inspection forms. Service entry policy may vary between DLH’s – see information in Appendix B of “Design and planning framework” document for details. All meter cabinets must be installed in a way that maintains the manufactured fire resistance values. Service connections shall be made to the correct phase as shown on network drawings.4
Service entries a. Grey phases with Blue Neutral). c.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 11 of 17
harmonised cable colours (Black. The numbers of services taken from a single joint shall not exceed the number agreed with the Host DLH. b. Cavity service entry shall not normally be permitted as this de-rates the service cable. NJUG 6 shall be implemented unless otherwise stated by the Host DLH. n.3
Plant a. for each joint made. p. internal arc relief etc.
. These shall be kept in the Construction File. property ownership and Danger of Death signs prior to energisation. Specifications of HV/LV distribution substations shall follow Host DLH standards detailed in Appendix B. The Host DLH shall supply plant and substation numbering signage. o. b. c. signed by the jointer. q. Brown. Cable terminations shall be made with correct phase connections. that number being the maximum the Host DLH would accept for work undertaken directly on its own behalf. a unique permanent labelling system shall be applied to the joint giving the jointers name.
3) The size of the enclosure is dictated by the equipment installed and the need for adequate working space.5
Multi. risk of fire or risks to operatives. Service ducting shall be installed from the service position to the point where the service cable will be jointed onto the main. There shall be a minimum of 300mm separation to any gas meter or gas pipe joints. The Applicant shall provide phase marking on cut out terminals. minimum bending radius 900mm.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 12 of 17
e. f. a. 4) Where the building entrance is closed for security reasons or there is no alternative means of escape. buried with minimum 450mm cover overlaid with marker tape and into drawpit in termination enclosure 700mmD. The service cable shall be drawn by hand into this duct. Intake position accommodation: 1) The Developer is to provide suitable secure and fire proof enclosure for cut out and distribution board (when required) in suitable common access location on ground floor minimising route length to exterior and which provides suitable cable routes. refer to Appendix A for any Host DLH variations. Some DLHs do not employ drawpits and use duct as described above to area clear of building and any concreted area. to prevent confusion with other utility services. The following paragraphs describe the most common practices. Black duct shall be used for electrical service cables. meter position and exit points for each dwelling. 1000mmL 450mmW.
. 150mm inside diameter. with drawcord for each incoming mains cable to area clear of building and any concreted area. not all will necessarily be accepted by Host DLH. There are a number of different approaches which are employed in various DLH service areas on the design of connections to multi-occupancy dwellings such as flats and maisonettes. c. the enclosure should be sited adjacent to an external wall and be accessible from outdoors. 2) Communal meter / service enclosures shall not be used for other purposes posing increased risk to equipment. b. Cable entry to building: This should be an approved rigid black duct or fireclay duct with slow radius bend.occupancy dwellings The following additional clauses apply to installations for multi-occupancy dwellings. weatherproof and vandal resistant. See Appendix A for Host DLH requirements on locks. If outside doors are used these shall be lockable.
7. The average temperature shall not exceed 30C.
Mains shall not be routed through dwellings. shaft or trunk must have internal barriers to prevent excessive heat rise at the top. effectively screened or effectively bonded against the risk of electric shock by simultaneous touch under earth fault conditions. The routes selected within the building must ensure that after installation cables are accessible for withdrawal / replacement without damage to the building. 3) Mains and service cables must not be in the same duct as non electrical services. Meter positions shall be accessible from communal areas. proprietary sealing systems. intumescent mastics. gypsum based plaster.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 13 of 17
d. Meters should be positioned so that they are installed not less than 450mm and not more than 1800mm from the floor.
. 2) Meter positions shall either be separated by 2 metres. Meter positions: 1) Meter cabinets shall be fire resistant. whichever is less. 2) Service cables must not be routed through dwellings other than the one being served. Where not ducted it must be clipped to cable tray. e. 4) If service or mains cables pass through a part of the building required to have a minimum fire resistance period. to which reference must be made. rockwool or as specified differently by the Host DLH in Appendix A. the electrical installation must be compartmented to provide a fire barrier from the other services. cement or gypsum based vermiculite / perlite mixes. construction and installation of the service cable routes within the building. the installation must maintain the integrity of the fire resistance. The method of ducting should be agreed with the Host DLH taking account of the derating factor of the current carrying capacity of the cables. Lateral connections: 1) The developer is responsible for the design. After installation of cabling the developer shall carry out fire stopping using materials such as cement mortar. The maximum separation between barriers is 1 floor or 5 metres. 3) Group meters and switchgear must be clearly identified to the appropriate dwelling by a secure label supplied and installed by the Developer. Where a multiservice shaft is provided. Every vertical duct. The design route / cable length used to calculate voltage drop shall not be exceeded. and of a type approved by the Host DLH. Minimum fire resistance periods are listed in the Building Regulations.
ducts lengths and sizes.
. worker risk mitigation both during installation and during subsequent service life to asset removal. e. irrespective of any bonding carried out elsewhere. allowing the movement of contamination Prevention of damage or reduction in normal life of assets as a result of contamination.g. the following: • • • Prevention of the creation of pathways. The accuracy requirements and means by which plans are provided to the Host DLH shall be the same as would apply if the work was undertaken directly for the Host DLH. 2) Each dwelling shall be regarded as separate and treated in the same way as individual houses. 7. These records shall include: • For all installed cables and joints: plans showing route. joint and service phasing and earth rod location. special precautions will need to be established. type. e. joint locations. where communal services enter the building.
b. The Developer shall ensure that PME bonding shall include bonding to metal services as close as possible to their point of entry into the building and to accessible steelwork. to cover in particular. It shall be the responsibility of the Applicant to provide the Host DLH with accurate records of the installation.g.
RECORDS a. maker. creation of barriers or use of specific resistant materials The CDM file shall include: details of the contamination survey. Bonding: 1) The bonding of the electrical installations must be in accordance with BS 7671. for example by trenching. depth. cable types and sizes.6 Work in contaminated land Where work is to take place in contaminated land. by the removal of contamination. (Note that there are also draft requirements set out in NRSWA Records Code of Practice) For all installed plant: location. The Host DLH shall provide the Applicant with information in Appendix B to facilitate this.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 14 of 17
f. rating and serial numbers.
ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 15 of 17
TESTS a. it is safe to energise and customers may be safely connected. b. Appendix A provides a list of typical test requirements. The extent of tests required and the format for recording test results will be specified by the Host DLH in Appendix B. The Applicant shall perform tests on the complete installation to verify that it has been correctly installed.
at HV/LV substation – combined HV/LV / not combined and overlap (depends on achieving < 1 Ohm) . BR-Y .pressure test .pressure test RYB-E.earth resistance .insulation resistance ph-ph and ph-n/earth 500/1000V . electrode Earthing resistance
LV fuse cabinet HV/LV transformer
.continuity .protection test.m.insulation resistance 5kV .gas pressure if gas filled .functional test of interlocks and operation . new to new or new to existing .ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 16 of 17
APPENDIX A: TEST REQUIREMENTS Each service .insulation resistance 500/1000V insulation resistances HV to LV winding/earth pressure test voltage and phasing checks tap setting check oil moisture content oil electric breakdown strength statement on pcb content < 2ppm new oil
Each new section of main
Each p. RY-B.insulation resistance 5kV .insulation test any loose test devices .earth loop impedance .overall value measured at substation . secondary injection or dummy HV fuse tester (e.insulation resistance 500/1000V . B&S device) .e.continuity
.g.busbar resistance if work includes connection of busbars .polarity / phase rotation (3ph) .
All meter cabinets must be installed in a way that maintains the manufactured fire resistance values. Service entries National Joint Utilities Group Publication Number 6 . The meter cabinet and installation arrangement shall be one of the type agreed with the Host DLH [ongoing need to hold spare doors etc. These arrangements shall be agreed in advance and documented. If alternative arrangements are considered the following shall be taken into account: The air temperature surrounding the cut out must not exceed 30ºc.
HOST DLH REQUIREMENT – ASSET RECORDING – Typical example only Principles of recording cables Taking measurements using triangulation Extended sight lines and right angles Chain Lines ` Same feature recording Other data to be recorded on site Recording of cable sections Process of cable recording Example of cable sketch
.Service Entries for New Dwellings on Residential Estates (NJUG 6) shall be implemented with one exception: (a) Cavity service entry shall not normally be permitted as this de-rates the service cable.ENA Engineering Recommendation G81 Pt3 Issue 1 Amendment 1: January 2008 Page 17 of 17
APPENDIX B: HOST DLH REQUIREMENTS – Typical Example Only The following is only provided as an indication of the type of information which would be included by the Host DLH in this Appendix. with appropriate drawings.].
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