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Electrical services – Health Technical Memorandum 06-01 Electrical services supply and distribution: Part A – Design considerations Electrical services Health Technical Memorandum 06-01: Electrical services supply and distribution Part A: Design considerations SOURCE OF ELECTRICAL SUPPLY PRIMARY SOURCE SECONDARY SOURCE PUBLIC ELECTRICAL SUPPLY (PES) DISTRIBUTION NETWORK OPERATOR (DNO) HEALTHCARE PREMISES INTERNAL ELECTRICAL INFRASTRUCTURE HV (11 kV) HIGH VOLTAGE NETWORK(S) LV (400 V) Alternative Energy Plant Combined Heat and Power (CHP) Emergency Power Plant High Voltage Substation www.tso.co.uk 9 780113 227556 Low Voltage Sub Main (Unified) Distribution Board Low Voltage Sub Main (Segregated) Distribution Board Low Voltage Sub Main (Dual Unified) Distribution Board TERTIARY POWER SUPPLY UNINTERRUPTIBLE POWER SUPPLY THE ELECTRICAL SYSTEM ISBN 0-11-322755-8 LTAGE NETWORK(S) Low Voltage Distribution Switch Panel
DH INFORMATION READER BOX Policy HR / Workforce Management Planning Clinical Estates Performance IM & T Finance Partnership Working Document Purpose Best practice guidance ROCR Ref: 0 Title Health Technical Memorandum 06-01, Part A: 'Electrical services supply and distribution' Author Department of Health / Estates and Facilities Division Publication Date Oct Feb 2006 2007 Target Audience PCT CEs, NHS Trust CEs, SHA CEs, Care Trust CEs, Foundation Trust CEs , PCT PEC Chairs, NHS Trust Board Chairs, Special HA CEs Circulation List Department of Health libraries, House of Commons library, Strategic Health Authorities, UK Health Departments, Directors of Estates and Facilities, Description Health Technical Memorandum 06-01, Part A, provides guidance on the design, installation and testing of all fixed wiring and integral electrical equipment used for electrical services within healthcare premises. Cross Ref HTM 06-01, Part A 0 HTMs 2007, 2011 and 2014 0 0 0 Superseded Docs Action Required Gateway Ref: 7165 Timing N/A Contact Details Chris Holme Department of Health/Estates and Facilities Division Quarry House, Quarry Hill Leeds LS2 7UE 0113 254 5932 0 0 For Recipient's Use
Electrical services Health Technical Memorandum 06-01: Electrical services supply and distribution Part A: Design considerations London: The Stationery Office
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Published by TSO (The Stationery Office) and available from: Online www.tsoshop.co.uk Mail, Telephone, Fax & E-mail TSO PO Box 29, Norwich NR3 1GN Telephone orders/General enquiries 0870 600 5522 Fax orders 0870 600 5533 E-mail customer.services@tso.co.uk Textphone 0870 240 3701 TSO Shops 123 Kingsway, London WC2B 6PQ 020 7242 6393 Fax 020 7242 6394 16 Arthur Street, Belfast BT1 4GD 028 9023 8451 Fax 028 9023 5401 71 Lothian Road, Edinburgh EH3 9AZ 0870 606 5566 Fax 0870 606 5588 TSO@Blackwell and other Accredited Agents Crown copyright 2007 Published with the permission of the Estates and Facilities Division of the Department of Health, on behalf of the Controller of Her Majesty’s Stationery Office. This document/publication is not covered by the HMSO Click-Use Licences for core or added-value material. If you wish to re-use this material, please send your application to: Copyright applications The Copyright Unit OPSI St Clements House 2–16 Colegate Norwich NR3 1BQ ISBN 0-11-322755-8 978-0-11-322755-6 First published 2007 Printed in the United Kingdom for The Stationery Office ii The paper used in the printing of this document (Revive Silk) is 75% made from 100% de-inked post-consumer waste, the remaining 25% being mill broke and virgin fibres. Recycled papers used in its production are a combination of Totally Chlorine Free (TCF) and Elemental Chlorine Free (ECF). It is recyclable and biodegradable and is an NAPM and Eugropa approved recycled grade.
Preface About Health Technical Memoranda Engineering Health Technical Memoranda (Health Technical Memoranda) give comprehensive advice and guidance on the design, installation and operation of specialised building and engineering technology used in the delivery of healthcare. The focus of Health Technical Memorandum guidance remains on healthcare-specific elements of standards, policies and up-to-date established best practice. They are applicable to new and existing sites, and are for use at various stages during the whole building lifecycle: main source of specific healthcare-related guidance for estates and facilities professionals. The core suite of nine subject areas provides access to guidance which: is more streamlined and accessible; encapsulates the latest standards and best practice in healthcare engineering; provides a structured reference for healthcare engineering. Figure 1 Healthcare building life-cycle CONCEPT DISPOSAL RE-USE DESIGN & IDENTIFY OPERATIONAL REQUIREMENTS OPERATIONAL MANAGEMENT Ongoing Review MAINTENANCE COMMISSIONING INSTALLATION Healthcare providers have a duty of care to ensure that appropriate engineering governance arrangements are in place and are managed effectively. The Engineering Health Technical Memorandum series provides best practice engineering standards and policy to enable management of this duty of care. It is not the intention within this suite of documents to unnecessarily repeat international or European standards, industry standards or UK Government legislation. Where appropriate, these will be referenced. Healthcare-specific technical engineering guidance is a vital tool in the safe and efficient operation of healthcare facilities. Health Technical Memorandum guidance is the SPECIFICATIONS TECHNICAL & OUTPUT PROCUREMENT CONSTRUCTION Structure of the Health Technical Memorandum suite The series of engineering-specific guidance contains a suite of nine core subjects: Health Technical Memorandum 00 Policies and principles (applicable to all Health Technical Memoranda in this series) Health Technical Memorandum 01 Decontamination Health Technical Memorandum 02 Medical gases iii
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Health Technical Memorandum 03 Heating and ventilation systems Electrical Services – Electrical safety guidance for low voltage systems Health Technical Memorandum 04 Water systems In a similar way Health Technical Memorandum 07-02 will simply represent: Health Technical Memorandum 05 Fire safety Environment and Sustainability – EnCO2de. All Health Technical Memoranda are supported by the initial document Health Technical Memorandum 00 which embraces the management and operational policies from previous documents and explores risk management issues. Health Technical Memorandum 06 Electrical services Health Technical Memorandum 07 Environment and sustainability Health Technical Memorandum 08 Specialist services Some subject areas may be further developed into topics shown as -01, -02 etc and further referenced into Parts A, B etc. Example: Health Technical Memorandum 06-02 Part A will represent: HTM 08 HTM 01 Specialist Services IF I C D O HTM 05 C U iv M EN Fire Safety TS Policies and Principles STR Medical Gases CUMENTS HTM 00 IO NA L& DU HTM 02 N EUROPEA Y S TA N D ST D AR DO IN Electrical Services S HTM 03 S Heating & Ventilation Systems IC INTER NA T HTM 06 RD & EUROPEAN AL N ST IO T NA INTER C H E A LT H S P E Environment & Sustainability T R Y S TA N D A RDS DA AN HTM 07 S DU IF IN Decontamination EC L FIC DOC UM EN TS HTM 04 SP A HE SPECI H T DH Estates and Facilities Division wishes to acknowledge the contribution made by professional bodies, engineering consultants, healthcare specialists and NHS staff who have contributed to the review. AN DA RDS Figure 2 Engineering guidance Some variation in style and structure is reflected by the topic and approach of the different review working groups. Water Systems HE T AL H
Executive summary Health Technical Memorandum 06-01 – ‘Electrical services supply and distribution’ replaces Health Technical Memorandum 2007 – ‘Electrical services supply and distribution’ and Health Technical Memorandum 2011 – ‘Emergency electrical services’, and absorbs Health Technical Memorandum 2014 – ‘Abatement of electrical interference’. This part (Part A) provides guidance for all works on the fixed wiring and integral electrical equipment used for electrical services within healthcare premises. This document should be used for all forms of electrical design work ranging from a new greenfield site to modifying an existing final subcircuit. The relevance of each section will depend on the extent of the design works. It provides guidance to managers of healthcare premises on how European and British Standards relating to electrical safety such as the IEE Wiring Regulations BS 7671, the Building Regulations 2000 and the Electricity at Work Regulations 1989 can be used to fulfil their duty of care in relation to the Health and Safety at Work etc Act 1974.
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Acknowledgements Main working group Owen Cusack Northumbria Healthcare NHS Trust Peter Desforges Develop Alan Gascoine Mayday Hospital Ian Hawthorn Sandwell General Hospital Chris Holme Department of Health Estates and Facilities Jim Mellish Skanska UK PLC John Murray Bender UK Nigel Porter Welsh Health Estates Mike Ralph Great Ormond Street Hospital Steve Wilson Faber Maunsell AECOM Subject working groups Switchgear and Protection Schneider Electric Containment Systems Dick Shelly Skanska UK PLC Andrew Galloway Great Ormond Street Hospital Isolated Power Supplies John Murray Bender UK Electromagnetic Compatibility Alwyn Finney vi ERA Technology
Contents Preface Executive summary Acknowledgements Chapter 1 Chapter 2 Chapter 3 Chapter 4 Scope of Health Technical Memorandum 06-01 Abbreviations and definitions Introduction Overview How to read this Health Technical Memorandum Initial considerations Sources of supply Resilience Essential/non-essential supplies Primary sources of supply Secondary main sources of supply – generation Tariff negotiations and private generation Supply voltages Design of installations for growth and change Assessment of existing electrical systems Greenfield site New-build on existing site New equipment on existing site Load profile Diversity factors Consideration for EMC requirements Roles and responsibilities Access for maintenance Commissioning procedures Connection to the DNO Connection to the healthcare site network Supply from the DNO Supply from internal connection point Understanding risk and ownership Introduction Need for risk assessment Ownership and design Risk profile Clinical risk Category 1 – Support service circulation Category 2 – Ambulant care and diagnostics Category 3 – Emergency care and diagnostics Category 4 – Patients in special medical locations Category 5 – Life support or complex surgery Non-clinical and business continuity risk Category 1 – Business support services 1 5 7 17 vii
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Chapter 5 Chapter 6 Chapter 7 viii Category 2 – Building services safety and security Category 3 – Building services environmental control Category 4 – Medical support services Electrical infrastructure Resilience Electrical infrastructure system selection Power quality Power factor correction Located at the intake point Located at sub-main distribution boards Located on the electrical equipment Harmonics Located at the intake point Located at sub-main distribution boards Located on the electrical equipment Voltage surge protection Distribution strategy Design for resilience Supply connections Risk of transformer failures Risk of generator failures Other reasons for failure of electricity supply Distribution system – high voltage HV network – one radial circuit with one substation only HV network – one radial circuit with three substations HV network – three radial circuits each with one substation HV ring network – ring with four substations Primary and secondary distribution systems Primary supply – unified infrastructure Primary and secondary supply – unified and segregated infrastructure Primary and secondary supply – unified and dual-unified infrastructure Dual primary and dual secondary supply – unified and dual-unified infrastructure Dual primary and dual HV secondary supply – dual-unified infrastructure Dual primary and dual LV secondary supply – dual-unified infrastructure Final circuits Fixed equipment Power outlets Lighting circuits Primary power – distribution centres HV substations Location Construction Access and egress Layout Fire precautions Environmental requirements Equipment and notices provided Transformer enclosures Location Construction Access and egress Fire precautions Environmental requirements 25 28 41
Contents Chapter 8 Chapter 9 LV switchrooms Location Construction Access and egress Layout Fire precautions Environmental requirements Equipment and notices required to be provided Secondary power centres and plant Secondary power general arrangements Photovoltaic power secondary power source Wind turbine power source General – secondary power plant location Essential power capacity Essential and emergency power provision Standby generators Design criteria Component parts Generator configuration Mobile plug-in generator island operation Generator(s) in island operation Generator(s) operating in parallel with PES LV generators feeding HV ring main Generator control Generating set management Multi-set operation Mains return Computerised load management of generators Standards and references Generator engines Batteries and battery charging Fuel and fuel storage Exhaust systems Environmental considerations Protection and switchgear High-voltage switchgear Withdrawable units Semi-withdrawable units Fixed-pattern units High-voltage busbar sections High-voltage protection devices High-rupture-capacity (HRC) fuse links to BS 2692, IEC 60298 Time fuse links to ESIS 12.6 Inverse definite minimum time (IDMT) relays Bias differential relays Earth fault passage indicators Grading of protection systems Network reconfiguration after a fault or outage Distribution transformer types Fluid-type transformers Dry-type transformers Package substation Transformer protection 48 62 ix
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Chapter 10 Chapter 11 Chapter 12 Generator protection Low-voltage switchboards Form 2 Form 3 Form 4 Motor control centre (MCC) Final distribution boards and consumer units Low-voltage protection devices Switch Disconnector Fuse Circuit breaker Low-voltage busbar sections Discrimination of protective devices Discrimination with HBC/HBC fuses Discrimination with MCB/MCCB Discrimination with MCB/fuse Discrimination with RCDs Automatic load management of switchgear (HV, LV) Tertiary power supplies Batteries for uninterruptible power supplies Battery type Battery life Battery arrangements Battery autonomy Batteries for inverter units Battery type Battery life Battery arrangements Battery autonomy Generator batteries Battery type Battery life Battery autonomy Electromagnetic compatibility Standards Procurement requirements EMC phenomena Standards and levels Electromagnetic environment Designing systems for EMI control EMC control for power systems EMC control for cables and cable-containment systems EMC control for general systems Cable segregation and separation Cable screening, trunking and trays Crosstalk characteristics Using conductive structural supports as runs for cables Identification of critical systems Earthing and bonding Wiring systems High voltage Low voltage 74 77 87
Contents Chapter 13 Chapter 14 Chapter 15 Chapter 16 Medical IT Protected extra low voltage systems Separated extra low voltage systems Earthing High-voltage earthing methods High-voltage network cables High-voltage generator earths Low-voltage main earthing methods Low-voltage generator earths Switchroom earths Earths for radiographic rooms Medical IT or isolated power supply earths Microshock Circuit protective conductors Functional earth Monitored earthing systems Lightning protection Lightning protection system components Ionised fields Containment Trenches, service tunnels and ducts Ladder rack – tray – basketry Trunking – conduits Preformed wiring containment Layout considerations Fire precautions Remodelling and extensions Circuit segregation Access for maintenance Suitable locations Cable and busbar types High-voltage distribution Low-voltage distribution Cable identification Busbar distribution Control alarm and communication cables Control communication and non-fire-alarm cables Information technology cables Fire alarm cables Final circuits Uninterruptible power supplies Standards Rating UPS environment UPS description and configurations UPS fault condition design UPS power quality UPS resilience Inverter units Central battery units Rectifier units for theatre operating lamps Isolated power supplies (IPS) IPS environment 88 97 101 105 xi
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations IPS communication Resilience The patient environment IPS low-power circuits General low-power circuits Socket-outlets/connection units Sockets for special locations Sockets for operating theatre suites Socket for mobile X-ray units Spark-proof sockets Number of outlets per final circuit Fixed equipment Supplies to external buildings Temporary supplies Connections for mobile trailer units General lighting Theatre operating lamps Examination lamps lighting Emergency escape lighting Standby lighting Fire alarm, security circuits and critical alarms BEMS communication and control wiring systems Chapter 17 Validation and commissioning Validation of specific plant Generators and CHP plant Uninterruptible power supplies Isolated power supplies Fixed wiring distribution, switchgear and protection Records to be kept As-installed drawings Building logbook Appendix 1 Maximum interruption times to the primary supply Appendix 2 Sample test record sheets Appendix 3 Drawing symbols References Acts and Regulations British, European and International Standards Department of Health publications Miscellaneous publications xii 118 123 124 134 135
1 Scope of Health Technical Memorandum 06-01 1.1 1.2 1.3 1.4 Health Technical Memorandum 06-01 – ‘Electrical services supply and distribution’ replaces Health Technical Memorandum 2007 – ‘Electrical services supply and distribution’ and Health Technical Memorandum 2011 – ‘Emergency electrical services’, and absorbs Health Technical Memorandum 2014 – ‘Abatement of electrical interference’. This part (Part A) provides guidance for all works on the fixed wiring and integral electrical equipment used for electrical services within healthcare premises. The document should be used for all forms of electrical design work ranging from a new greenfield site to modifying an existing final subcircuit. BSRIA: Building Services Research and Information Association CCM: CIBSE commissioning manual CCTV: closed-circuit television CDM: Construction Design and Management Regulations CE: European Conformity CENELEC: The European Committee for Electrotechnical Standardization CHP: combined heat and power CIBSE: Chartered Institute of Building Services Engineers This document provides guidance to managers of healthcare premises on how European and British Standards relating to electrical safety such as the IEE Wiring Regulations BS 7671, the Building Regulations 2000 and the Electricity at Work Regulations 1989 can be used to fulfil their duty of care in relation to the Health and Safety at Work etc Act 1974. CPC: circuit protective conductor The policies and principles of all engineering services are described in Health Technical Memorandum 00 – ‘Policies and principles’, which should be read in conjunction with this document. DRUPS: diesel rotary uninterruptible power supplies Abbreviations and definitions 24 x 7: 24 hours a day, 7 days a week ac: alternating current ACB: air circuit breaker AMD: assumed maximum demand AVR: automatic voltage regulator BASEC: British Approvals Services for Electrical Cables BEMS: building energy management system BMS: building management system BS: British Standards CT: current transformer DB: distribution board DBU: distribution unit dc: direct current DNO: distribution network operator DTC: diagnostic and treatment centres EC: European Community ECG: electrocardiogram EEA: European Economic Area EEC: European Economic Community EI: extreme inverse EMC: electromagnetic compatibility EMCD: electromagnetic compatibility directives EMI: electromagnetic interference EPR: electronic patient records ERB: earth reference bar ERIC: Estates Return Information Collection
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations ESD: electrostatic discharge MCCB: moulded-case circuit breaker ETSI: European Telecommunications Standards Institute MD: maximum demand EU: European Union Medical IT: medical impedance terra (earthed) also known as IPS FL: full load GRP: Glass-reinforced plastic GSM: global system for mobile communication HBC: high breaking capacity HBN: Health Building Note HDU: high dependency unit HFN: Health Facilities Note HGN: Health Guidance Note MEIGaN: Medical Electrical Installation Guidance Notes MET: main earth terminal MRI: magnetic resonance imaging NEAT: NHS Environmental Assessment Tool NHS: National Health Service OCB: oil circuit breaker HRC: high rupturing capacity OJEC/OJEU: Official Journal of the European Community/Union HV: high voltage (11 kV) ONAN: oil natural circulation, air natural flow HVAC: heating ventilation and air-conditioning PEC: protective earth conductor ICU: intensive care unit PEI: primary electrical infrastructure IDMT: inverse definite minimum time PELV: protected extra LV IEC: International Electrotechnical Commission PES: public electrical supply IEE: Institute of Electrical Engineering PET: protective earth terminal IGBT: Insulated-gate bipolar transistor PF: power factor IM&T: information management and technology PFC: power factor correction IMD: insulation monitoring device PFI: Private Finance Initiative IP: ingress protection (rating) PPE: personal protective equipment IPS: isolated power supplies (also known as medical IT) PPS: primary power source ISO: International Standards Organisation PSCC: prospective short-circuit current ISS: intake substation PV: photovoltaic cell IT: impedance terra earthed (derived from an isolated power supply) PVC: polyvinyl chloride ITU: intensive therapy unit IV: intravenous LBTC: logbook template customisable LBTS: logbook template standard LDRP: labour delivery room and post partum LPS: lightning protection system LV: low voltage M&E: mechanical and electrical MCB: miniature circuit breaker MCC: motor control centre RCBO: residual current breaker with overcurrent RCD: residual current device REF: restricted earth fault RMU: ring main unit SCADA: supervisory control and data acquisition SCBU: special care babies unit SELV: separated extra LV SF6: sulphur hexafluoride SI: Système Internationale SP & N: single phase and neutral
1 Scope of Health Technical Memorandum 06-01 SPS: secondary power source TETRA: trans-European trunked radio access TFL: time fuses links may also be referred to as tlf timelag fuses THD: total harmonic distortion TN-C: combined neutral and earth throughout the electrical distribution system TN-C-S: neutral and earth is combined at point of supply and separate throughout the electrical installation TN-S: separate neutral and earth throughout the electrical system TP & N: three-phase and neutral TPS: tertiary power supply UMTS: universal mobile telecommunications service UPS: uninterruptible power supply VRLA: valve regulated lead acid (battery) VT: voltage transformer XLPE: cross-linked polyethylene Applied part: part of a medical electrical device which in normal use necessarily comes into physical contact with the patient for the device to perform its function or can be brought into contact with the patient correct and in a safe manner. The designer need not be a direct employee of the healthcare organisation. Essential: any part of the electrical distribution and/or final circuits that can be automatically transferred between either the primary or secondary supply circuits. Medical electrical equipment: electrical equipment intended to diagnose, treat or monitor a patient under medical supervision which will make physical or electrical contact with the patient, transfer energy to and from the patient, or detect such energy flows. Note: equipment is not covered by this Health Technical Memorandum. The Medicines and Healthcare products Regulatory Agency (MHRA) is the government agency which is responsible for ensuring that medical equipment works and is acceptably safe. Medical IT (IPS): IT electrical system having specific requirements for medical installations. The system will include a monitoring device to provide an alarm on loss of IMD connections, insulation failure, overload and high temperature. Medical location: location intended for the purpose of diagnosic treatment (including cosmetic) or monitoring a patient under medical supervision. Group 0 Medical location where no applied parts are intended to be used. Group 1 Medical location where discontinuity of the electrical supply is not a risk to human life (unless the location is part of a Group 2 location). or Group 2 Medical location where discontinuity of the electrical supply can cause danger to life. needs to be touched by the patient. Note: “discontinuity” means any unplanned loss of the power supply (see MEIGaN). Authorised Person (HV): a person appointed to take responsibility for the effective management of the safety guidance given in Health Technical Memorandum 06-03 – ‘Electrical safety guidance for high voltage systems’. Authorised Person (LV): a person appointed to take responsibility for the effective management of the safety guidance given in Health Technical Memorandum 06-02 – ‘Electrical safety guidance for low voltage systems’. Dual-unified distribution: separate primary and secondary circuits collectively forming the electrical distribution of the healthcare facility. The secondary supply is equal to the primary supply; that is, both primary and secondary circuits are fully rated and provide a resilient distribution. Designer: a person (or organisation) with the responsibility to design the electrical services technically MEIGaN: Medical Electrical Installations Guidance Note published by MHRA. Normal (non-essential): any part of the electrical distribution and/or final circuits connected only to the primary distribution and with no means of being connected to the essential (secondary) distribution. Note: in some distributions, manual reconfiguration may allow the normal circuits to be temporarily connected to the essential (secondary) distribution. Patient: living person undergoing healthcare, therapy or diagnostic investigation (including dental and cosmetic). Patient environment: any area in which intentional or unintentional contact can occur between the patient and parts of the electrical system or between the patient and other persons in contact with parts of the system (see Figure 44).
Electrical services – HTM 06-01 Electrical services supply and distribution: Part A – Design considerations Point of use: Electrical distribution points where electrical equipment may be connected. This may be an accessory or isolator etc. Protected extra LV: a SELV system that is earthed at one point only. Additional protection against direct contact is achieved by barriers and/or enclosures. Alternatively the insulation will have a “withstand” test voltage of 500 V dc for 60 seconds. Residual risk: a risk that has not been fully mitigated by the design process. Segregated distribution: an electrical distribution that includes separated primary and secondary circuits not of equal size or capacity. The secondary circuits are the only circuits that are supported by the standby power system. Separated extra LV: an LV system (normally not exceeding 50 V ac or 120 V ripple-free dc) derived from a safety source such as an isolating transformer to BS EN 61558-1:1998 and BS EN 61558-2. Single point of failure: a connection point (other than a point of use) where any upstream single fault will cause the loss of supply to the downstream parts of the distribution. Stakeholder: a person (or organisation) with vested interest (not necessary pecuniary) in the electrical services quality and provision at healthcare premises. The stakeholders will normally be an employee of the healthcare organisation. Tertiary power supply: a third supply that supplements the primary and secondary supplies, usually in the form of an UPS or battery system. Unified distribution: primary (normal) and secondary (essential) circuits combined as one circuit to form a common electrical distribution of the healthcare site. Where the secondary power source does not provide 100% capacity of the primary power source, local automatic devices will be required to isolate the nonessential circuits whenever the primary power source is not available.
2 Introduction Overview 2.1 Health Technical Memoranda 2007, 2011 and 2014 have been superseded and combined into one document: Health Technical Memorandum 06-01. 2.2 Health Technical Memorandum 06-01 Part A addresses design considerations for the electrical services supply and distribution within any healthcare facility. Part B addresses the operational management and maintenance of the
HTM 06-01, Part A 0 HTMs 2007, 2011 and 2014 Oct 2006 PCT CEs, NHS Trust CEs, SHA CEs, Care Trust CEs, Foundation Trust CEs , PCT PEC Chairs, NHS Trust Board Chairs, Special HA CEs Department of Health libraries, House of Commons library, Strategic Health Authorities, UK Health Departments, Directors of Estates and Facilities,
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