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Meter Operations Code of Practice and Safe Working Methods

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Meter Operations Code of Practice and Safe Working Methods METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING METHODS Restricted Page 1 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING METHODS Number……………………………………………….. Issued to……………………………………………… Signature……………………………………………... Date……………………………………………………. THIS IS A CONTROLLED DOCUMENT It is the property of Siemens Operational Services Authors: - Technical Field Services Issued by: - Issue Date: - Issue Medium Hard copy Electronic Copy Restricted Page 2 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 This signed copy to be held in central records METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING METHODS Number……………………………………………….. Issued to……………………………………………… Signature……………………………………………... Date……………………………………………………. THIS IS A CONTROLLED DOCUMENT It is the property of Siemens Operational Services Authors: - Technical Field Services Issued by: - Issue Date: - Issue Medium Hard copy Electronic Copy Restricted Page 3 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Contents: Issue Control Sheets Page 3 Contents Page 5 Definitions Page 10 Section 1 Introduction, Related Policies and Environment 1.1 Siemens Operational Services Policy Page 15 1.2 Copyright Page 15 1.3 Code of Practice Page 15 1.4 The Company Role Page 16 1.5 Competent Person Page 16 1.6 Environment Page 16 Section 2 Health and Safety 2.1 Reporting of Accidents and Incidents Page 19 2.2 Near Miss – Hazards Page 19 2.3 Reporting of Distribution Defects Page 20 2.4 Risk Assessment Page 20 2.5 Prevention of Electric Shock Page 20 2.6 Field Safety Alerts Page 21 2.7 Ladders and Steps Page 21 2.8 Tools and Equipment Page 21 2.9 Testing Devices and Instruments Page 21 2.10 Portable Electric Tools Page 22 2.11 Portable Appliance Testing Page 22 2.12 Personal Protective Equipment Page 22 2.13 Insulated Gloves Page 22 2.14 Safety Helmets Page 23 2.15 Eye Protection Page 23 2.16 Protection Against Excessive Noise Page 23 2.17 Respiratory Protection Page 24 2.18 Footwear Page 24 2.19 High Visibility Clothing Page 24 2.20 Work Wear Page 24 2.21 COSHH (Control of Substances Hazardous to Health) Page 24 2.22 Asbestos Page 25 2.23 Building and Construction Sites Page 25 2.24 Idle Services Page 26 2.25 Labels, Stickers and Cards Page 27 Restricted Page 4 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Contents: Section 3 Basic Electrical Safety Requirements (Single and Multi Phase) 3.1 Single Phase Page 29 3.2 Multi Phase Page 32 3.3 Sealing of Metering Equipment Page 35 Section 4 Testing 4.1 Visual Inspection and Responsibilities Page 37 4.2 Polarity Testing Page 37 4.3 Proving Dead Page 38 4.4 Working at Outside Meter Positions Page 38 4.5 Insulation Resistance Testing Page 40 4.6 Visual Earthing Check Page 40 4.7 Phase to Earth Loop Impedance Test Page 40 4.8 Phase Sequence Check Page 41 4.9 Fault Diagnosis (Timing Devices and Contactors) Page 41 4.10 De-energisation of Service Page 41 4.11 Disconnection and Removal of all or Part of Metering Equipment Page 42 4.12 Temporary Supplies (Areas of Special Risk) Page 43 4.13 Suspected Interference at the Meter Position Page 43 4.14 Approved Testing Devices for Voltage and Polarity Page 44 4.15 Glow Test for Single and Multi Phase Installations Page 45 4.16 One Fuse Test For Multi Phase New and Existing Installations Page 47 4.17 Phase Rotation Test Page 48 4.18 Testing Phase to Neutral and Phase to Phase across Multi Phase Terminals with Approved Test Lamp Page 49 4.19 Testing sequence at a cut out using an approved test lamp on both TNC-S and TN-S Earthing Systems Page 50 4.20 Testing Isolators Page 51 Restricted Page 5 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Contents: Section 5 Layouts and Making Connections to Metering Equipment 5.1 Terminating Cables Page 53 5.2 Square Clamp Connections Page 54 5.3 Cables Page 55 5.4 Neutrals Direct into Meter Page 56 5.5 Harmonisation of Cable Colours Page 57 5.6 Standard Layouts for Whole Current Metering Page 58 5.7 Layout of Meter Boards Page 58 5.8 Meter Boards Page 58 5.9 Outdoor Meter Cupboards Page 59 5.10 Damaged Meter Boxes Page 59 5.11 Standard Layout for a Single Phase Meter Position Page 60 5.12 Standard Layout for a Multi Phase Meter Position Page 61 5.13 Load Research and Energy Efficiency Equipment (Connected) Page 62 5.14 Fuse Rating Page 62 5.15 Rising Main Installations and Pre-Payment Meters (Debt Collection Devices) Page 63 5.16 Checking Meter Tolerance / Accuracy Page 63 5.17 Connection of Check Meters Page 64 5.18 Connection of Single Phase Check Meters Page 65 5.19 Connection of Multi Phase Check Meter Page 66 5.20 Single Phase Whole Current Sub-Metering Page 67 5.21 Multi Phase Whole Current Sub Metering Page 68 5.22 Multi Way Distribution Boards (Feeding Sub Mains and Meters in Remote Locations) Page 69 5.23 Intake Rooms Page 70 5.24 Import / Export Metering Principles Page 71 5.25 Half and Full Clarke Cabinets Page 74 5.26 Connection of Earthing Systems to Cut Outs Page 75 Restricted Page 6 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Contents: Section 6 CT Operated Commissioning Procedure 6.1 Compliance Requirement Page 77 6.2 General Commissioning Principles Page 77 6.3 Working Practices Page 77 6.4 Commissioning Procedure Page 78 6.5 Meter(s) Configuration and Operation Page 78 6.6 Load Comparison Test Result Page 79 6.7 Customer Pulsing Consideration Page 79 6.8 Operations Effecting Pulse Outputs or Data Streams Page 79 6.9 Code of Practice Compliance Page 79 6.10 Typical Example of CT Operated Metering (Diagram 1) Page 80 6.11 Typical Example of CT Operated Metering (Diagram 2) Page 81 6.12 Isolating LV Cubicles Page 82 6.13 Presence of Voltage on LV Test Block Page 82 Section 7 Safe Working Methods Whole Current 7.1 General Risk Assessment at the Meter Position Page 85 7.2 General Risk Assessment at the Meter Position and cut out (Before Work Commences) Page 86 7.3 Working on Single and Multi Phase Cut Outs Page 87 7.4 Changing Single Phase Meters Where Access is Gained Page 92 7.5 Changing a Single Phase Meters Where No Access Page 95 7.6 Installation of Single Phase Meters to an Energised Service (New Connection) Page 98 7.7 Changing Multi Phase Meters Where Access to Installation Is Gained Page 101 7.8 Installation of a Multi Phase Meters to an Energised Service (New Connection) Page 105 7.9 Changing a Single Phase Meter Where the Cut Out is Remote from the Meter Position Page 108 7.10 Reconnection of Single Phase Meter Page 112 7.11 Reconnection of Multi Phase Meter Page 115 7.12 Changing a Single Phase Meter to an Import / Export Meter Where Access is Gained Page 119 7.13 Changing a Multi Phase Meter to an Import / Export Meter Where Access is Gained Page 122 7.14 Installation of Single Phase Whole Current Sub- Meter Page 126 7.15 Installation of Multi Phase Whole Current Sub-Meter Page 130 7.16 Installation of Check Meter Page 134 7.17 Removal of Check Meter Page 139 7.18 De-energisation and Removal of Metering Equipment Page 144 7.19 Gas Escape Procedure Page 148 Restricted Page 7 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Contents: Section 8 Safe Working Methods CT Operated Metering 8.1 Installation and Replacement of GSM Modems Page 151 8.2 LV CT Operated Meter Install or Change to Panel Only Page 152 8.3 Installation of LV CT Chamber/Cabinet and CTs Page 154 8.4 Installation of LV Metering Terminal (T) Box Page 157 8.5 Installation of HV Metering Terminal (T) Box Page 159 8.6 HV VT/CT Operated Meter Install or Change to Panel Only Page 161 8.7 COP 4 Testing OF HV and LV Meters Page 163 8.8 Installation of Half Hourly Sub Meter Page 165 Appendices Appendix 1 Impact of EU Harmonisation of Cable Colours Page 167 Appendix 2 National Doorstep Protocol Page 169 Appendix 3 Management of Meter Stocks within the Field Page 171 Please note: This document is subject to regular review and therefore the issue status cannot be considered as “latest” when printed. Restricted Page 8 © Siemens Operational Services 2009 – 2014 All rights reserved Version 2 Definitions AIRline accident and incident reporting system. Associated Equipment not the meter e.g. connector block – time switches – contactors – isolators – time switch fuses. Back Feed when a conductor becomes live after the main point of isolation. Barrier a part providing a defined degree of protection against direct contact with live equipment. BEBS S12 (ENA 50-19) Standard Wiring Code Numbers BNO Business Network Owner Bunched cables are said to be “bunched” when two or more are connected into the same terminal of the meter or associated equipment. Cold Calling calling with no prior customer notification or soft call period has expired. Conductor a cable connected to a meter or associated equipment. Control Measure something put into place to reduce or eliminate the risk . Cut Out normally the main point of isolation provided by the Network Owner. Dead at or about earth potential and disconnected from any LIVE SYSTEM. Debt Collection Device (DCD) a prepayment meter usually installed/connected remotely from the source of supply and the billing meter.
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