ECS POT ENDING LV SWA SERVICE CABLES

Transcription

1 Document Number: ECS Network(s): Summary: ENGINEERING CONSTRUCTION STANDARD ECS POT ENDING LV SWA SERVICE CABLES EPN, LPN, SPN The engineering construction standard details the method of opening and pot ending steel wire armoured (SWA) PVC sheathed service cables. Author: Jesse Garcia Approver: Paul Williams Date: 23/04/2018 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 version. Circulation UK Power Networks External Asset Management UK Power Networks Services Capital Programme Contractors Connections ICPs/IDNOs Health & Safety Meter Operators Legal G81 Website Network Operations Procurement Strategy & Regulation Technical Training THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE

2 Revision Record Version 2.0 Review Date 23/04/2023 Date 05/04/2018 Author Jesse Garcia Reason for update: First year review. What has changed: No content changes. Version 1.0 Review Date 31/01/2018 Date 03/01/2017 Author Jesse Garcia New document which details the method of opening pot ending SWA PVC sheathed service cables. UK Power Networks 2018 All rights reserved 2 of 9

3 Contents 1 Introduction Scope Glossary and Abbreviations Jointing Instructions LV SWA Service Cable Pot Ends Materials Installation Instructions PVC Sheath removal Steel Wire Armour opening PVC Bedding removal Core cutting and capping Completing the pot end References UK Power Networks Standards... 9 UK Power Networks 2018 All rights reserved 3 of 9

4 1 Introduction This Engineering Construction Standard details the jointing methods for the opening and pot ending of LV steel wire armoured (SWA) PVC sheathed street lighting service cables. 2 Scope This standard applies to all LV SWA PVC service cables between 4mm 2 and 35mm 2 feeding street lighting or other street furniture, which forms part of the UK Power Networks Low Voltage Distribution Network. 3 Glossary and Abbreviations Term LV SWA PVC PILC Cable UK Power Networks Definition A low voltage cable with an PVC outer sheath and steel wire armours. Paper Insulated Lead Sheathed Cable UK Power Networks (Operations) Ltd consists of three electricity distribution networks: Eastern Power Networks plc (EPN). London Power Network plc (LPN). South Eastern Power Networks plc (SPN). 4 Jointing Instructions The table below detail the joint kits required to complete this type of joint for the cable sizes listed. Any jointing requirements for cable sizes not shown on this table shall be referred to one of the UK Power Networks Jointing Schools. Important Note: Due to the make-up of this cable being different to other cables used in UK Power Networks additional training and/or experience is required to complete this work. If in doubt, make the service cable dead. 5 LV SWA Service Cable Pot Ends 5.1 Materials UKPN commodity codes required to carry out the LV SWA PVC service cable pot ends. Description Cable Size (mm2) UKPN Stores Code Sicame Kit No. Single Phase Heatshrink Pot end 4 to 35 (1 Phase) 02793U BAH Three Phase Heatshrink Pot end 4 to 35 (3 Phase) 02794E SE4/UPN Temporary Earth Bond Kit 4 to R TCC0.06/UPN UK Power Networks 2018 All rights reserved 4 of 9

5 5.2 Installation Instructions PVC Sheath removal Clean the outer PVC sheath of the cable and abrade for 60mm with a rasp, to form a moisture seal. Remove 300mm of the outer PVC sheath. Refer to the UKPN LV Manual Section removing the outer PVC Sheath Steel Wire Armour opening Apply a wire binder around the steel wire armours 25mm from the outer sheath cut at both end of the cable. Install the service temporary earth bond, consisting of a length insulated braid and two constant force springs, around the steel wires between the sheath removal point and the wire binders.. Using a plastic small wedge and insulated side cutters, cut the individual armour wires around in the centre of the joint. UK Power Networks 2018 All rights reserved 5 of 9

6 Fold the wires back against the binder at both ends, so they are away from the working area. PVC tape the cut steel wire armours to the PVC either side of the joint PVC Bedding removal Shroud the exposed armours and the continuity bond connections at both cable ends. 25mm from the folded back armours, ring round the PVC bedding with a plastic Mini- Hepnyf. Note: The Mini-Hepnyf needs to be new with a clean sharp edge to ensure that the bedding can be removed without causing damage to the insulation on the cores below. Remove the bedding between the two bedding removal points, by applying gentle heat to the bedding. Note: Excessive heat will make the bedding too soft and make it more difficult to remove. Refer to Section of the LV Jointing Manual. If the bedding layer is difficult to remove or if it is bonded to the core insulation, then the cable shall be made dead, prior to continuing with the bedding removal process. UK Power Networks 2018 All rights reserved 6 of 9

7 5.2.4 Core cutting and capping Refer to Section of the LV Jointing Manual. A PILC two or four core heatshrink pot end kit should be utilised depending on the number of cores in the SWA cables. Once the cores are exposed, test the cores to prove live and neutral. Insert a plastic cutting wedge between the cores and cut each live core in turn centrally and install a temporary cap. Finally cut the neutral core and install a temporary cap. UK Power Networks 2018 All rights reserved 7 of 9

8 Cut each of the live core(s) 70mm from the bedding and install the heatshrink cap provided in the joint kit, as per Section of the LV Jointing Manual. Cut each of the neutral core 70mm from the bedding and install the heatshrink cap provided in the joint kit, as per Section of the LV Jointing Manual Completing the pot end Remove the temporary earth continuity bond and any temporary shrouding. Allow the heat caps to cool, then apply two half lap layers of PVC insulation tape over the cores. Fold the steel wires back over the previously applied PVC tape, trim them to the same length as the phase and neutral cores. Apply two half lap layers of PVC tape over the wire armours and tinned copper mesh, make sure all sharp edges are covered. UK Power Networks 2018 All rights reserved 8 of 9

9 Slide the mastic coated heatshrink tube over to the 60mm of sheath abrasion and shrink into place ensuring a good water seal. As per Section of the LV Jointing Manual section. Slide the mastic coated large heat shrink cap over the previously shrunk tube and shrink in place, starting at the sealed end, before working towards the open end. To prevent the cap sliding off hold in place using an insulated wedge. Allow to cool before fitting the yellow plastic safety bag in place. Once the pot end has cooled, place the yellow bag over the joint, ensure that the hazard symbol is on the top and fix in place with PVC tape. 6 References 6.1 UK Power Networks Standards UK Power Networks LV Jointing Manual UK Power Networks 2018 All rights reserved 9 of 9