EDS LV CUSTOMER SUPPLIES UP TO 100A SINGLE PHASE

Transcription

1 Document Number : EDS Network(s): Summary: ENGINEERING DESIGN STANDARD EDS LV CUSTOMER SUPPLIES UP TO 100A SINGLE PHASE EPN, LPN, SPN This standard provides guidance on the provision of single-phase low voltage supplies up to 100A including modifications to looped services. Supplies to street lights and other unmetered street furniture and supplies associated with multi-occupied buildings are not included. Author: Stephen Cuddihey Approver: Paul Williams Date: 20/12/2017 This document forms part of the Company s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue. Circulation UK Power Networks External Asset Management G81 Website Capital Programme UK Power Networks Services Connections Contractors Health & Safety ICPs/IDNOs Legal Meter Operators Network Operations Procurement Strategy & Regulation Technical Training THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE

2 Revision Record Version 7.0 Review Date 20/12/2022 Date 13/11/2017 Author Stephen Cuddihey Reason for change: Re-alignment of LV design standards. What has been changed: References to LV design standards updated throughout. Document renumbered from EDS to EDS SNE services updated in accordance with EDS (Section 5.3.3) Document reviewed and review date extended Version 6.1 Review Date 01/09/2021 Date 21/04/2017 Author Lee Strachan Reason for change: Minor version update, updating Material list document references What has been changed: references to EAS changed to EAS , EAS and 0009 both changed to EAS Version 6.0 Review Date 01/09/2021 Date 18/01/2017 Author Stephen Cuddihey Reason for change: Updated to provide guidance on the use of pup fuses. What has been changed: Pup fuse guidance added to Section 6.4 Version 5.0 Review Date 01/09/2021 Date 02/09/2016 Author S. Cuddihey Why has the Document been changed: EBP has been incorporated into EDS and a recent DCUSA addition has altered the position on meter responsibility. What has been changed: Section 4 references to overhead services now removed to provide an open, easier position for new services. Section 4.5 incorporates new guidance for meter positions. Section no longer comments on UK Power Networks meter responsibility. Section 5.5 includes a reminder that meter tails and customer wiring may require additional work if fuse upgrades are provided. Section guidance on looped services ownership clarified. The previous Section 6 on looped services has now been incorporated into Section 5.7 and rearranged for easier use. Section 7.4 contains updated guidance on the provision of small services across the UK Power Networks license areas. This information differs from the now withdrawn EBP UK Power Networks 2017 All rights reserved 2 of 19

3 Version 4.0 Review Date 01/08/2018 Date 04/08/2015 Author Stephen Cuddihey Reason for change: Periodic review and clarification of some requirements of the standard to provide guidance on common issues. What has been changed: Clarification of internal meter positions. Clarification of meter ownership. Disconnections aligned with EDS practice. Refinement of loop services guidance. Guidance provided for cladded properties. Guidance provided for fuse downgrade requests. Implementation of updated template. Version 3.0 Review Date 01/09/2014 Date 17/06/2013 Author S. Cuddihey Clarification of meter box provision, clarification of hockey stick requirements, clarification of small service scope. Appendix K & L moved to EDS Version 2.0 Review Date 01/06/2013 Date 03/05/2012 Author Ron Cordwell Amendment to section 5.1, Appendix C added. Appendix B & G amended, Amendment made to section Version 1.0 Review Date Date 12/12/2011 Author Ron Cordwell Original UK Power Networks 2017 All rights reserved 3 of 19

4 Contents 1 Introduction Scope Abbreviations and Definitions New Service Installations General Service Cable Service Length Ducting Meter Cabinet Meter Tails Customer Installation New Looped Services Services to Premises within Parks Existing Services General Alterations to Overhead Services Alterations to Underground Services Disconnections Fuse Upgrades Fuse Downgrades Existing Looped Services General Requirements Earthing Network Records Smart Home Integrated Technologies Pup Fuses (EV Charging Points and Outbuildings) Small Service Charging References UK Power Networks Standards National Standards UK Power Networks 2017 All rights reserved 4 of 19

5 1 Introduction This standard provides guidance on the provision of single-phase low voltage supplies up to 100A including modifications to looped services. Supplies to street lights and other unmetered street furniture and supplies associated with multi-occupied buildings are not included. A range of underground service arrangements and different types of cable may be encountered across UK Power Networks three licence areas. This standard addresses the installation of new services and includes alterations to existing services. 2 Scope This standard applies to 100A single-phase supplies only. For other LV connections refer to: EDS for IDNO connections. EDS for supplies to multi-occupied buildings. EDS for unmetered supplies. EDS for supplies above and including 100A (three phase). This standard is designed to work in conjunction with the LV network design standard EDS This standard does not apply to IDNO LV supplies; refer to EDS Abbreviations and Definitions Term Definition CNE Combined neutral and earth (cable) Hockey Stick Domestic service duct into the customer s property, refer to EAS Looped service PILC PME Primary service Pup Fuse/ Pup Busbar SNE UK Power Networks A service that is derived from connection to another service cable, either by an underground cable joint or from the live-side cut-out terminals of the primary service Paper insulated lead sheath cable Protective multiple earthing A service connected to a distributing main A metal bar attached to WT Henley Series 7 and 8 cut outs to provide an additional supply Separate neutral earthing / separate neutral earth (cable) UK Power Networks Ltd consists of three electricity distribution networks: Eastern Power Networks plc (EPN). London Power Network plc (LPN). South Eastern Power Networks plc (SPN) UK Power Networks 2017 All rights reserved 5 of 19

6 4 New Service Installations 4.1 General UK Power Networks prefer new services to be supplied via underground cable and supplied directly from a distribution underground mains cable. Refer to EDS for additional information regarding underground mains. UK Power Networks does not permit access to its equipment by uncontrolled parties. Only the appointed meter operator, UK Power Networks staff, representatives or ICPs with appropriate authorisation are permitted to make connections to a UK Power Networks cut-out, including the neutral earth terminal. Electricians and customers are not permitted to connect the customer s earth conductor to the cut-out neutral terminal. A customer-owned earth wire and earth block adjacent to the cut-out shall be installed by UK Power Networks (or by an ICP where the assets are provided contestably) to accommodate this. 4.2 Service Cable New service cables to domestic premises shall use the approved 35mm 2 single-phase aluminium cable (refer to EAS ) and shall terminate in an approved 100A cut-out (refer to EAS ). 4.3 Service Length The overall length of a new single-phase 35mm 2 service shall be no greater than 43 metres including the length of the hockey stick. The route of the cable shall only cross land belonging to the property it supplies or public/communal land. 4.4 Ducting The cable shall be installed in a 32mm internal diameter UK Power Networks approved duct as specified in EAS Meter Cabinet The customer shall install and maintain an approved surface or flush mounted single-phase meter cabinet (refer to EAS ), at an agreed, external facing position with hockey stick. The cabinet shall house only the: Service cut-out. Metering equipment (including electricity smart meter communications hub and/or gas meter communications hub). Customer s isolating switch or switch fuse (if fitted). Customer owned earth wire and earth block (if fitted). Refer to EDS for surface and flush mounted meter cabinet arrangements. Surface mounted cabinets require an externally mounted hockey stick. Where a flush mounted meter cabinet is required, a hockey stick may be installed within the wall cavity on the provision of adequate damp proofing as determined by the customer in accordance with building regulations. UK Power Networks 2017 All rights reserved 6 of 19

7 Internal meter positions (e.g. porch, garage, under stairs etc.) are not acceptable in domestic dwellings. However where an external meter position is not practical in a commercial property (e.g. glass fronted shop) an internal meter position may be considered provided that the intake position complies with the following requirements: The meter position is not located in inappropriate or insecure locations without the installation of segregation or safeguards, for example: In an area which constitutes a hostile environment e.g. where steam, water vapour or chemical fumes are present. In an area where it may be subjected to mechanical damage i.e. behind a door which when opened could strike the unit, in an open area where vehicular access/use of mobile equipment could cause damage by impact. It is particularly important for a freestanding supply intake position (building, cubicle or cupboard) that it is located in a safe and secure location inaccessible to impact from vehicles. Directly beneath, within, or immediately adjacent to the bottom of a vertical service duct containing a water pipe where a leak could result in water ingress to the electrical equipment. In a location with insufficient headroom, clear access and egress or working space where there is a risk of personal injury. In a location that may be particularly susceptible to fire damage e.g. a communal bin store or public area. Segregated from any gas and water pipes by a minimum of 0.5 metres. Not installed adjacent to a gas intake/regulator. Not installed in a basement. The incoming cable route shall be designed to give the shortest possible length of incoming cable inside the building. The service shall be located on or as close as possible to an outside wall nearest to the direction of cable entry into the building. 4.6 Meter Tails Standard 25mm 2 copper double-insulated conductors (meter tails) from the meter to the cutout shall be provided and installed by the appointed meter operator. Standard 25mm 2 copper double-insulated conductors shall be provided and installed by the customer from the consumer unit for connection by the meter operator into the outgoing (load side) of the meter. BS 7671 Regulation allows a maximum distance of three metres between overload protection devices and their source, therefore the customer shall provide and install an intermediate switch fuse or isolating switch if the distance between the meter and consumer unit is greater than three metres. The customer should seek professional electrical advice to determine the protection equipment that is appropriate for the customer given the impedance at the cut-out and the design of their installation as UK Power Networks is unable to advise on these aspects. Meter tails shall not be installed or run inside the cavity wall of a building other than passing directly through the wall. Tri-rated cables shall not be terminated onto UK Power Networks equipment. UK Power Networks 2017 All rights reserved 7 of 19

8 4.7 Customer Installation It is the customer s responsibility to ensure that their electrical installation from the out-going terminals of the meter is installed and tested in such a manner that it will comply with BS 7671 immediately prior to energisation. The customer shall grant access to confirm satisfactory compliance when requested. 4.8 New Looped Services New looped services shall not be installed. A secondary service may be provided from a busbar type cut-out as defined in EAS In this instance the primary service shall be fused down to 60A and secondary service fused to 30A. Refer to Section Services to Premises within Parks Where a premise requiring supply is situated in a park and the length of the service will not be greater than 43 metres (from existing mains to cut-out) this should be treated in the same way as a new domestic service as detailed in this section. If the position of premises to be supplied is such that the service length will be greater than 43 metres and a mains extension or new LV network is required, the additional network shall be designed in accordance with EDS (including legal agreements) with the additional criteria that cables laid within the park shall be: Installed within approved ducts (refer to EAS ), At agricultural depth (1200mm minimum), Covered by a cable tile marker Stokboard (refer to ECS ). In both instances, above and below 43 metres, the service shall be terminated in a brick built service termination cabinet (refer to EDS ) immediately adjacent to the customer service position. UK Power Networks 2017 All rights reserved 8 of 19

9 5 Existing Services 5.1 General When requested or required UK Power Networks shall undertake the relocation of customer services. UK Power Networks ownership boundary shall be at the outgoing terminals of the cut-out. UK Power Networks should liaise with the customer s Electricity Supplier with regard to work upon equipment at the approved meter board/position. UK Power Networks does not permit access to its equipment by uncontrolled parties. Only the appointed meter operator, UK Power Networks staff, representatives or ICPs with appropriate authorisation are permitted to make connections to a UK Power Networks cut-out, including the neutral earth terminal. Electricians and customers are not permitted to connect the customer s earth conductor to the cut-out neutral terminal; an earth block adjacent to the cut-out shall be provided by UK Power Networks to accommodate this. The customer shall arrange the provision of the new metering position; including new approved meter box if applicable (refer to Section 4.5). Whilst there is no obligation upon existing customers to relocate to an external meter position, UK Power Networks strongly recommends that internal meter positions are moved to external positions if feasible and practical. Relocation of the intake position may require alterations of the customer wiring. Refer to Section 4.6 for additional guidance. 5.2 Alterations to Overhead Services When modifications to existing overhead services are to be carried out, either during overhead line replacement or at a customer s request, consideration shall be given to the removal of the overhead service and replacement with an underground service at every opportunity. Where the existing overhead service is to be replaced, the service shall be disconnected in accordance with Section Where an underground service is not practical or feasible and an overhead service is unavoidable the complete service from mains connection to the property shall be replaced with a continuous run of conductor even if only part of the service requires replacement. The replacement service shall be installed in accordance with the overhead line manuals. The customer shall ensure that a suitable entry point is provided for the service cable, particularly in the case of thermally clad properties. UK Power Networks 2017 All rights reserved 9 of 19

10 5.3 Alterations to Underground Services Complete Replacement When a service alteration is requested or a replacement is required every opportunity shall be taken to provide a 100A service. Table 5-1 provides guidance on cables suitable to accept a 100A service. Table Single-phase Service Cables with Ratings Above 100A Cable Ducted Rating (A) in 2 (16mm 2 ) Copper PILC mm 2 Aluminium Concentric in 2 (25mm 2 ) Aluminium PILC mm 2 Copper Split Concentric in 2 (35mm 2 ) Aluminium PILC in 2 (35mm 2 ) Copper PILC 175 If the existing service cable is rated below 100A (i.e. those not listed in Table 5-1) a complete new service cable shall be installed from the LV mains cable. The previous service cable shall be disconnected in accordance with Section The replacement service shall adhere to the requirements of Section 4 (external meter position remains strongly recommended). Where a replacement service exceeds the 43 metre limit, a mains extension shall be required in accordance with EDS to reduce the service length to the 43 metre maximum Partial Replacement Due to the cost, highway accessibility or other constraints, the complete replacement of a service cable may be a significant challenge and prove unfeasible. Where an existing service rated below 100A cannot be wholly replaced; the existing service cable shall be traced to a suitable position within the customer owned boundary where the existing service cable may be cut and the new service extension safely jointed. If possible discarded sections of cables shall be recovered from the customer property. Note: No LV joints shall be installed within or beneath a building. If the remnant of the previous service cable is rated less than the new section of service cable, label EDS (refer to EAS ) shall be applied to the cut-out. The cut-out fuse shall be of a lower rating than that of the remnant service cable. The replacement service shall adhere to the requirements of Section 4 (external meter position remains strongly recommended). All alterations shall be identified on the LV mains record. UK Power Networks 2017 All rights reserved 10 of 19

11 5.3.3 SNE Services Where an SNE cable is to be completely or partially replaced and the premises supplied has a cable sheath earth terminal provided by UK Power Networks, the customer shall be given the opportunity to have a PME earth terminal made available. If this option is chosen it will be necessary for the customer to arrange for their installation to be checked to ensure it is suitable for connection to a PME network and for a new service cable to be installed by UK Power Networks (refer to Section 4.2). If the customer does not wish to adopt PME earthing the existing SNE service cable and earth terminal shall be retained, refer to EDS All other requirements for either complete or partial replacement are as per Sections and as appropriate. 5.4 Disconnections General This section refers to the removal of service cables and associated equipment. A temporary disconnection may be provided by the removal of fuses at the cut-out where no service alteration or work in the vicinity of the service equipment is required. This may be undertaken by either UK Power Networks or the electricity supplier appointed meter operator. In all instances of permanent disconnection, the appropriate LV mains record shall be updated with the alteration. Refer to HSS for additional information Overhead Service Disconnections Temporary disconnections are possible for overhead services. If the cable is of a modern ESQCR compliant design then the cable shall be disconnected from the LV network at the pole top and coiled at the customer end. This is recommended only for short periods of time, for example work that may be completed within the same day. Temporary disconnections of service cables referred to as non-esqcr compliant presents an opportunity to replace the service for an ESQCR compliant service, therefore service cable shall be removed for the duration of the works and replaced by UK Power Networks. As detailed in Section 5.2, the replacement of the overhead service with an underground service shall be considered. For temporary disconnections of underground services supplied by an adjacent overhead line: If the supplying pole lies within public land the descending cable shall be left intact and the service pot-ended within 1 metre of the supplying pole or at the boundary of the private land. If the supplying pole lies within private land the descending cable shall be removed at the pole top. Permanent disconnections shall entail the complete removal of the cut-out, service cable, lead-ins and termination point where possible. A permanent disconnection may also entail the removal of the supplying pole, stays and LV mains if a mains extension was required. This should only be considered when the customer site is to be permanently vacated with no foreseeable supply required. UK Power Networks 2017 All rights reserved 11 of 19

12 5.4.3 Underground Service Disconnections If temporary disconnection by fuse removal is insufficient, UK Power Networks shall treat all disconnections of underground LV metered service cables as permanent disconnections; the risk to customers of live cable within private land without a visible service termination is unacceptable. The service cable shall be disconnected, pot ended in public or communal land and if possible the dead section remaining on private land shall be removed. If the pot ended and live service cable is within 2 metres of the LV main and it is safe and practical to strap the service cable to the main without damaging the service joint, the LV main shall be exposed and the pot ended service cable shall be strapped to the mains cable with cable ties. If the remaining service cable is greater than 2 metres from the LV main, a risk assessment shall be undertaken to assess if full exposure of the service cable will not impact the public highway or to assess if another approved means of tracing the service cable is available. In the rare event that that the original service joint cannot be located or it is impractical to expose the service joint (for example it is obstructed by other services or encased in concrete) the existing service shall be cut and pot ended as near as possible to the mains cable and the position of this pot end marked and identified on the LV mains record. If the customer requests a complete and permanent disconnection, the cut-out and any LV mains on private land shall also be removed where possible. The removal of LV mains may impact the LV network; a diversion may be required to ensure continuity of supply. Underground LV mains within public land shall be retained. UK Power Networks 2017 All rights reserved 12 of 19

13 5.5 Fuse Upgrades The replacement of existing service fuses with larger capacity fuses (for example from 40A to 100A fuses) may be requested by customers and meter operators for a variety of reasons. Whilst the customer may request the provision of a 100A fuse which may in turn require the full upgrade of the service in line with section 4 to provide a 23kVA supply, the existing service may in part already fulfil the customer requirements. Therefore existing customer services shall be assessed in accordance with the customer requirements. If the cut out or service cable are of an acceptable standard and capable of accepting an approved fuse of sufficient size to meet the customer requirement, the existing service, or as much of that service as is possible, shall be retained. This shall be assessed on a case by case basis. To assist Table 5-2 provides some guidance on historical single phase customer services including fuse size and service cable rating; other combinations of single phase service. Table 5-2 Typical Existing Fuse Provisions Fuse Size (A) Power (kva) Typical Service cable Ducted Rating (A) 40A in 2 (4mm 2 ) Copper PILC 52 60A in 2 (10mm 2 ) Copper PILC in 2 (16mm 2 ) Aluminium PILC 79 80A mm 2 Aluminium Concentric A in 2 (16mm 2 ) Copper PILC mm 2 Aluminium Concentric in 2 (25mm 2 ) Aluminium PILC mm 2 Aluminium Spilt Concentric mm 2 Copper Split Concentric in 2 (35mm 2 ) Aluminium PILC in 2 (25mm 2 ) Copper PILC in 2 (35mm 2 ) Copper PILC 175 An increase of service may require alterations to the customer wiring and meter tails (refer to section 4.6). UK Power Networks 2017 All rights reserved 13 of 19

14 5.6 Fuse Downgrades Customers and meter operators may also request the replacement of 100A service fuses with 80A or 60A fuses. The customer shall be made aware that de-rating of their supply will limit their maximum load and reduce the scope of equipment typically found within domestic properties. Refer to EAS for the appropriate fuses. The appropriate version of label EDS (refer to EAS ) shall be applied to the cut-out. 5.7 Existing Looped Services General When alterations to an existing service are requested and a loop service is identified or if UK Power Networks identifies a condition based requirement for a loop removal, the opportunity should be taken to remove the complete loop arrangement and replace it with individual services directly supplied from an LV distribution network. Loop services may be retained provided they are: Supplied from an LV service in accordance with either Section 4 or EDS as required for the total load requirement of the remaining looped customers. The cut-out may be fused to 80A or 60A if appropriate for the remaining looped services. Removed at the first available opportunity. UK Power Networks shall own the main service and all looped services up to the intake position. In accordance with Section 4.6 the removal of looped services may require alterations to the customer internal wiring and relocation of the meter position. Refer to Sections 5.5, 4.5, 4.6 and 4.7 for guidance. For guidance under fault conditions, refer to section Consent to Work Consent from each looped building owner that will be affected by any proposed alteration work must be unanimously given before complete loop removal may commence. Each affected customer shall be contacted by UK Power Networks and formal consent recorded within the associated work pack. Where unanimous consent cannot be given and work is still possible, refer to Section Positioning of any new services shall not result in a situation where the actions of one customer could unduly impede future access to a cable or cable joint and delay the restoration of supply to other customers following a service fault. No LV mains shall be retained within private land without the appropriate legal consents; as detailed in Section 5.7.1, the remaining looped services shall be considered a single multioccupied building. UK Power Networks 2017 All rights reserved 14 of 19

15 5.7.3 Loop Earthing Both looped and directly supplied customers within the same building shall use the same earthing method. Where looped premises have cable sheath earthing, all customers shall be given the opportunity to have PME earth terminals made available when all loops are removed from the building, refer to Section Guidance on Costs Refer to EDS for guidance on cable rights and charging for costs associated with alterations to looped services Fault Conditions When a fault occurs on a looped service; if the fault is external to the looped properties and it is feasible to do so; the loop shall be repaired on a like for like basis to expedite quick restoration. If the fault is internal to the looped properties or a repair is not feasible, as per Section 5.7.1, UK Power Networks shall take the opportunity to directly supply as many impacted properties as feasible, treat the remaining looped properties as an incomplete loop removal and ensure the supply earthing is satisfactory for all properties. Properties that can no longer be supplied by the loop shall be provided with direct services. Properties that can safely remain on a loop shall do so until it becomes feasible to provide them with direct supplies. Damaged loops supplying cut outs shall, if feasible, be replaced on a like for like basis. If a like for like replacement is not possible, direct services shall be considered. UK Power Networks 2017 All rights reserved 15 of 19

16 6 General Requirements 6.1 Earthing Earthing requirements are defined for the specific circumstances included in this standard. Refer to EDS and EDS which provide further details on earthing of the LV distribution network, including positioning of neutral earth bonds and earth electrodes, and specific customer installations. 6.2 Network Records All alterations of LV services shall be recorded. Refer to EOS for guidance on the recording of LV networks. 6.3 Smart Home Integrated Technologies The installation of various domestic renewable energy generating technologies requires the customer to notify their DNO of the installation prior to or up to 28 days following the device installation, in accordance with Regulation 22(2a) of the ESQCR. Refer to EBP for guidance on these submissions. 6.4 Pup Fuses (EV Charging Points and Outbuildings) As described in EOP , the UK Power Networks approved cut-out provides a facility for a parallel 30A fuse from a maximum 60A primary fuse to supply dedicated domestic services that cannot be provided by a BS 7671 domestic consumer unit. The additional supply is restricted to 30A, therefore the pup fuse is unsuitable for flats or other domestic dwellings that require the typical suite of facilities (e.g. kitchens, storage heaters etc.). The 30A pup fuse shall not be used for loop supplies or flats within a multi-occupied building. The pup fuse is ideal for electric vehicle charging points, external lighting or dwellings within the curtilage of an existing property covered by class E of the General Permitted Developments Order 2015 (e.g. garages, enclosed swimming pools, sheds, other outbuildings etc.). The local council planning officer should be consulted for further information on class E developments. The primary 60A supply shall remain in accordance with either Sections 4 or 5 as appropriate. The 30A pup fuse supply shall be metered remotely from the cut out at a position discussed, approved and provided by the customer with their electricity supplier. The meter tails for the 30A pup fuse supply shall comply with Section 4.6. Earthing for the 30A pup fuse supply shall be in accordance with Section 6.1; it should be noted that PME to buildings covered by class E may require additional consideration, refer to EDS for specific information. Refer to EOP for technical guidance on the provision of pup fuse supplies. UK Power Networks 2017 All rights reserved 16 of 19

17 6.5 Small Service Charging This section provides guidance on the charging provisions for the small service activities detailed below. This guidance is specific to services derived from this design standard and shall not be applied to services from other design standards Service Fuse Upgrades Service fuse upgrades to 60A, 80A or 100A (refer to Sections 5.5 and 5.6) shall be provided at no charge to the customer. Service fuse upgrades require an assessment of the service cut-out and service cable and may require replacement of both if necessary to support the additional load. The meter tails shall be of the sufficient cross sectional area to accommodate the increased load requirement (refer to Section 5.5) Cut-out Changes When notified by customer, Meter Operator or during a scheduled site visit, cut-outs of an unacceptable standard shall be replaced at no charge to the customer. A cut-out shall only be changed under the following circumstances: It is damaged or faulty. It is of a type with fuse in the neutral. It is of a type with re-wireable fuses. The metal clad casing is unearthed. The cut-out is deemed to be overloaded. For additional information refer to EDS If possible a cut-out shall be replaced on a like for like basis to avoid additional complications. Cut-out replacements require an assessment of the service cable to ensure the cable is suitable for the new cut-out and fused accordingly (refer to Section 5.5). If an increase in service fuse size is unavoidable, the customer shall be informed that their meter tails shall be of the sufficient cross sectional area for the new cut-out fuse Overhead Line Service Alteration Renewal of Flight When a customer requires the renewal of the overhead line service cable due to poor condition, as a result of a free-of-charge fuse upgrade (Section 6.5.1) or a free-of-charge cutout change (Section 6.5.2) and an underground service is not practical the service cable replacement shall be provided at no charge to the customer. The new service cable flight shall be a minimum 35mm 2 cross section. This may require the upgrade of both the customer cut out and supply fuses, refer to Sections and UK Power Networks 2017 All rights reserved 17 of 19

18 6.5.4 Provision of an Earth Facility Where a customer requires the provision of an earth terminal due to the removal of a water pipe earth etc. refer to the process in EDS The customer s electrician may connect the customer s earth to a separate earth block provided by UK Power Networks using 16mm 2 earth cable. Note: UK Power Networks shall not terminate customer wiring into the supplied earth block. UK Power Networks is not an enforcing or advisory body for BS Where questions of the adequacy of the customer s installation need to be resolved the electrical contractor should seek advice from the trade body providing his accreditation e.g. Electrical Contractors Association (ECA), National Inspection Council for Electrical Installation Contracting (NICEIC) etc. Arrangement of the customer installation is entirely at the discretion of the customer. Legislation requires that the customer installation shall be provided, installed and maintained in accordance with BS 7671 by the customer s electrical contractor Provision and Installation of Red Head Links Within the EPN and SPN regions, customers supplied by UK Power Networks owned and maintained rising and lateral networks may request red head points of isolation adjacent to their metering position, in accordance with EDS These shall be installed at no charge to the customer. A Henley WT Series 8 cut out, equipped with a red fuse link (refer to EAS ) shall be installed in a position adjacent to the customer whole current meter. This shall be scheduled in conjunction with the customer Meter Operator to minimise supply interruptions. UK Power Networks is unable to provide this facility to customers within the LPN region and customers supplied by rising and lateral networks not owned by UK Power Networks; these customers should be referred to their building network operator. UK Power Networks 2017 All rights reserved 18 of 19

19 7 References 7.1 UK Power Networks Standards EAS EAS EAS ECS EDS EOP EDS EDS EDS EDS EDS EDS EDS EDS EDS EDS EOS HSS Approved Equipment List Cables and Joints Approved Equipment List LV Plant and Equipment Signs and Labels for Operational Sites & Equipment Installation of Underground Cables - LV to 132kV Standard for the Replacement of Service Cables and Service Terminal Equipment Pup Busbar for WT Henley Cut-Outs Earth Fault Loop Impedance Requirements LV Network Earthing Design Customer Installation Earthing Design Advice on charging for the diversion or removal of electric lines and electrical plant installed on land in private ownership LV Electrical Service Drawings Guidance for Inset Networks Supplies to Multi-Occupied Buildings LV Network Design Standard LV Supplies Above 100A Unmetered Connections Process for Site Recording of Cables, Plant & Equipment. Energisation and Disconnection Notice Procedure 7.2 National Standards ESQCR Electricity Supply, Quality and Continuity Regulations 2002 BS 7671:2008+A3:2015 BS 9999 IET Wiring Regulations 17th Edition Code of practice for fire safety in the design, management and use of buildings (2008) The Town and Country Planning (General Permitted Development) Order 2015 UK Power Networks 2017 All rights reserved 19 of 19