• IEC 60050-826:2004

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    International Electrotechnical Vocabulary (IEV) - Part 826: Electrical installations

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  09-08-2022

    Language(s):  English - French, Spanish, Castilian

    Published date:  12-08-2004

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    INTRODUCTION - Principles and rules followed
    1 Scope
    2 Normative references
    3 Terms and definitions
    Section 826-10 - Characteristics of electrical installations
    Section 826-11 - Voltage and currents
    Section 826-12 - Electric shock and protective measures
    Section 826-13 - Earthing and bonding
    Section 826-14 - Electric circuits
    Section 826-15 - Wiring systems
    Section 826-16 - Other equipment
    Section 826-17 - Isolation and switching
    Section 826-18 - Capability of persons
    INDEX in French, English, Arabic, Chinese, German, Italian,
    Spanish, Japanese, Polish, Portuguese and Swedish

    Abstract - (Show below) - (Hide below)

    Deals with electrical installations such as those of residential, industrial or commercial premises. It has the status of a horizontal standard in accordance with IEC Guide 108.

    General Product Information - (Show below) - (Hide below)

    Committee TC 1
    Development Note Stability date: 2037. (09/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    IEC TR 61000-5-1:1996 Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines - Section 1: General considerations - Basic EMC publication
    DIN EN 61557-5 : 2007 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 5: RESISTANCE TO EARTH
    PD IEC/TS 62257-9-1:2016 (published 2016-10) Recommendations for renewable energy and hybrid systems for rural electrification Integrated systems. Micropower systems
    DIN VDE 0660-100 : 1992 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES
    BIS IS 13771 : 2013 LIVE WORKING - CONDUCTIVE CLOTHING FOR USE AT NOMINAL VOLTAGE UP TO 800 KV A.C. AND +/-600 KV D.C.
    BS EN 60694 : 1997 COMMON SPECIFICATION FOR HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR STANDARDS
    CEI UNI EN 45545-1 : 2013 RAILWAY APPLICATIONS - FIRE PROTECTION ON RAILWAY VEHICLES - PART 1: GENERAL
    DD IEC TS 62504 : DRAFT JUNE 2011 GENERAL LIGHTING - LEDS AND LED MODULES - TERMS AND DEFINITIONS
    15/30320611 DC : 0 BS EN 60445 - BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE INTERFACE, MARKING AND IDENTIFICATION - IDENTIFICATION OF EQUIPMENT TERMINALS, CONDUCTOR TERMINATIONS AND CONDUCTORS
    NBR IEC 60529 : 2017 DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (IP CODE)
    BS EN 50556:2011 ROAD TRAFFIC SIGNAL SYSTEMS
    CEI EN 60895 : 2005 LIVE WORKING - CONDUCTIVE CLOTHING FOR USE AT NOMINAL VOLTAGE UP TO 800 KV AC AND (+/-) 600 KV DC
    CEI EN 60974-1 : 2013 ARC WELDING EQUIPMENT - PART 1: WELDING POWER SOURCES
    DD ISO/TS 16952-1:2007 Technical product documentation. Reference designation system General application rules
    IEC 62305-3:2010 Protection against lightning - Part 3: Physical damage to structures and life hazard
    CSA C22.2 No. 60601.1 : 2014 MEDICAL ELECTRICAL EQUIPMENT - PART 1: GENERAL REQUIREMENTS FOR BASIC SAFETY AND ESSENTIAL PERFORMANCE
    11/30246431 DC : 0 BS EN 62548 - DESIGN REQUIREMENTS FOR PHOTOVOLTAIC (PV) ARRAYS
    10/30217405 DC : 0 BS EN 50556 - ROAD TRAFFIC SIGNAL SYSTEMS
    99/201504 DC : DRAFT MAR 1999 IEC 61477 ED.1 - LIVE WORKING - GUIDELINES FOR THE USE OF TOOLS AND EQUIPMENT FOR WORK ON LIVE PARTS
    UNE-EN 62504:2015 General lighting - Light emitting diode (LED) products and related equipment - Terms and definitions
    I.S. EN 60480:2005 GUIDELINES FOR CHECKING AND TREATMENT OF SULPHUR HEXAFLUORIDE (SF[6]) TAKEN FROM ELECTRICAL EQUIPMENT AND SPECIFICATION FOR ITS RE-USE
    I.S. EN 62790:2015 JUNCTION BOXES FOR PHOTOVOLTAIC MODULES - SAFETY REQUIREMENTS AND TESTS
    17/30294899 DC : 0 BS EN 60376 ED3.0 - SPECIFICATION OF TECHNICAL GRADE SULFUR HEXAFLUORIDE (SF[6]) AND COMPLEMENTARY GASES TO BE USED IN ITS MIXTURES FOR USE IN ELECTRICAL EQUIPMENT
    CEI 18-66 : 2013 ELECTRICAL INSTALLATIONS IN SHIPS - PART 509: OPERATION OF ELECTRICAL INSTALLATIONS
    95/210789 DC : DRAFT AUG 1995 IEC 61000-5-6 - ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 5: MITIGATION METHODS AND INSTALLATION GUIDELINES - SECTION 6: MITIGATION OF EXTERNAL INFLUENCES - TECHNICAL REPORT TYPE 2
    BS PD IEC TR 60664-2-1 : 2011 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 2-1: APPLICATION GUIDE - EXPLANATION OF THE APPLICATION OF THE IEC 60664 SERIES, DIMENSIONING EXAMPLES AND DIELECTRIC TESTING
    DIN ISO/TS 81346-3;DIN SPEC 1330:2013-09 INDUSTRIAL SYSTEMS, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS - STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS - PART 3: APPLICATION RULES FOR A REFERENCE DESIGNATION SYSTEM (ISO/TS 81346-3:2012)
    12/30239867 DC : 0 BS EN 62368-1 - AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS
    UNI EN 15280 : 2014 EVALUATION OF A.C. CORROSION LIKELIHOOD OF BURIED PIPELINES APPLICABLE TO CATHODICALLY PROTECTED PIPELINES
    CEI EN 60896-22 : 2005 STATIONARY LEAD-ACID BATTERIES - PART 22: VALVE REGULATED TYPES - REQUIREMENTS
    CEI EN 60896-21 : 2005 STATIONARY LEAD-ACID BATTERIES - PART 21: VALVE REGULATED TYPES - METHODS OF TEST
    BS EN 62790 : 2015 JUNCTION BOXES FOR PHOTOVOLTAIC MODULES - SAFETY REQUIREMENTS AND TESTS
    09/30214460 DC : 0 BS EN 50548 - JUNCTION BOXES FOR PHOTOVOLTAIC MODULES
    I.S. EN 50174-2:2009 INFORMATION TECHNOLOGY - CABLING INSTALLATION - PART 2: INSTALLATION PLANNING AND PRACTICES INSIDE BUILDINGS
    EN 60728-11 : 2017 CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES - PART 11: SAFETY (IEC 60728-11:2016 + COR1:2016)
    13/30287037 DC : 0 BS EN 62870 ED. 1.0 - ELECTRICAL INSTALLATIONS FOR LIGHTING AND BEACONING OF AERODROMES - SAFETY SECONDARY CIRCUITS IN SERIES CIRCUITS - GENERAL SAFETY REQUIREMENT
    BS EN 61000-5-7:2001 Electromagnetic compatibility (EMC). Installation and mitigation guidelines Installation and mitigation guidelines. Degrees of protection by enclosures against electromagnetic disturbances (EM code) - Degrees of protection against electromagnetic disturbances provided by enclosures (EM code)
    05/30133428 DC : DRAFT MAY 2005 IEC 62395-1 - ELECTRICAL HEAT TRACING SYSTEMS FOR INDUSTRIAL AND COMMERCIAL APPLICATIONS - PART 1: GENERAL AND TESTING REQUIREMENTS
    DIN SPEC 1330 : 2013 INDUSTRIAL SYSTEMS, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS - STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS - PART 3: APPLICATION RULES FOR A REFERENCE DESIGNATION SYSTEM (ISO/TS 81346-3:2012)
    NF EN 60480 : 2005 GUIDELINES FOR THE CHECKING AND TREATMENT OF SULPHUR HEXAFLUORIDE (SF6) TAKEN FROM ELECTRICAL EQUIPMENT AND SPECIFICATION FOR ITS RE-USE
    BS EN 61095:1993 ELECTROMECHANICAL CONTACTORS FOR HOUSEHOLD AND SIMILAR PURPOSES
    DIN EN 61000-5-7 : 2001 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 5-7: INSTALLATION AND MITIGATION GUIDELINES - DEGREES OF PROTECTION PROVIDED BY ENCLOSURES AGAINST ELECTROMAGNETIC DISTURBANCES (EM-CODE)
    UNE-HD 50573.5.57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    I.S. HD 384-7-708:2005 ELECTRICAL INSTALLATIONS OF BUILDINGS - PART 7: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - SECTION 708: ELECTRICAL INSTALLATIONS IN CARAVAN PARKS
    ECMA 341 : 4ED 2010 ENVIRONMENTAL DESIGN CONSIDERATIONS FOR ICT & CE PRODUCTS
    BS IEC 60092-509:2011 Electrical installations in ships Operation of electrical installations
    BS EN 62310-3 : 2008 STATIC TRANSFER SYSTEMS (STS) - PART 3: METHOD FOR SPECIFYING PERFORMANCE AND TEST REQUIREMENTS
    01/207232 DC : DRAFT OCT 2001
    BS 7699-9(1993) : 1993 AMD 9103 SPECIFICATION FOR SAFETY IN ELECTROHEAT INSTALLATIONS - PARTICULAR REQUIREMENTS FOR HIGH-FREQUENCY DIELECTRIC HEATING INSTALLATIONS
    CEI 109-5 : 2011 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 2-1: APPLICATION GUIDE - EXPLANATION OF THE APPLICATION OF THE IEC 60664 SERIES, DIMENSIONING EXAMPLES AND DIELECTRIC TESTING
    BS IEC 61892-3:2012 MOBILE AND FIXED OFFSHORE UNITS - ELECTRICAL INSTALLATIONS - PART 3: EQUIPMENT
    BS EN 50443 : 2011 EFFECTS OF ELECTROMAGNETIC INTERFERENCE ON PIPELINES CAUSED BY HIGH VOLTAGE A.C. ELECTRIC TRACTION SYSTEMS AND/OR HIGH VOLTAGE A.C. POWER SUPPLY SYSTEMS
    17/30356253 DC : 0 BS EN 62933-1 - ELECTRICAL ENERGY STORAGE (EES) SYSTEMS - PART 1: TERMINOLOGY
    EN 62262:2002 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code)
    BS PD ISO/TS 81346-3 : 2012 INDUSTRIAL SYSTEMS, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS - STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS - PART 3: APPLICATION RULES FOR A REFERENCE DESIGNATION SYSTEM
    HD 60364-8-1:2015 Low-voltage electrical installations - Part 8-1: Energy efficiency
    98/203578 DC : DRAFT JULY 1998 IEC 60364-7-716 - ELECTRICAL INSTALLATIONS OF BUILDINGS - PART 7-716: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - AUXILIARY CIRCUITS
    BS EN 50085-1 : 2005 CABLE TRUNKING SYSTEMS AND CABLE DUCTING SYSTEMS FOR ELECTRICAL INSTALLATIONS - PART 1: GENERAL REQUIREMENTS
    BS EN 62549 : 2011 ARTICULATED SYSTEMS AND FLEXIBLE SYSTEMS FOR CABLE GUIDING
    06/30145936 DC : DRAFT FEB 2006 IEC 60364-5-55 - LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-55: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - OTHER EQUIPMENT
    13/30288591 DC : 0 BS EN 60974-1 - ARC WEDLING EQUIPMENT - PART 1: WELDING POWER SOURCE
    09/30208429 DC : 0 BS EN 50467 - RAILWAY APPLICATIONS - ROLLING STOCK - ELECTRICAL CONNECTORS, REQUIREMENTS AND TEST METHODS
    15/30314469 DC : 0 BS EN 62548 ED.1 - PHOTOVOLTAIC (PV) ARRAYS - DESIGN REQUIREMENTS
    CEI EN 50274 : 2002 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PROTECTION AGAINST ELECTRIC SHOCK PROTECTION AGAINST UNINTENTIONAL DIRECT CONTACT WITH HAZARDOUS LIVE PARTS
    I.S. EN 61010-1:2010&A1:2019 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - PART 1: GENERAL REQUIREMENTS
    BS EN 60376 : 2005 SPECIFICATION OF TECHNICAL GRADE SULFUR HEXAFLUORIDE (SF[6]) FOR USE IN ELECTRICAL EQUIPMENT
    BS EN 60445:2017 Basic and safety principles for man-machine interface, marking and identification. Identification of equipment terminals, conductor terminations and conductors
    BS EN 60947-1 : 2007 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES
    11/30246444 DC : 0 BS EN 62075 ED 2.0 - AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - ENVIRONMENTALLY CONSCIOUS DESIGN
    NF EN 60895 : 2004 LIVE WORKING - CONDUCTIVE CLOTHING FOR USE AT NOMINAL VOLTAGE UP TO 800 KV A.C. AND +/- 600 KV D.C.
    16/30338981 DC : 0 BS EN 60934 - CIRCUIT-BREAKERS FOR EQUIPMENT (CBE)
    CSA C22.3 No. 61936-1 : 2008 : R2015 POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
    BIS IS 15382-1 : 2014 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 1: PRINCIPLES, REQUIREMENTS AND TESTS
    CEI EN 60376 : 2006 SPECIFICATION OF TECHNICAL GRADE SULFUR HEXAFLUORIDE (SF[6]) FOR USE IN ELECTRICAL EQUIPMENT
    BS ISO 18086 : 2015 CORROSION OF METALS AND ALLOYS - DETERMINATION OF AC CORROSION - PROTECTION CRITERIA
    04/30111859 DC : 0 IEC 62271-1 - HIGH-VOLTAGE SWITCHGEAR AND CONTROL GEAR - PART 1: COMMON SPECIFICATIONS
    11/30246420 DC : 0 BS EN 50443 - EFFECTS OF ELECTROMAGNETIC INTERFERENCE ON PIPELINES CAUSED BY HIGH VOLTAGE A.C. ELECTRIC TRACTION SYSTEMS AND/OR HIGH VOLTAGE A.C. POWER SUPPLY SYSTEMS
    14/30297921 DC : 0 BS EN 62040-5-3 - UNINTERRUPTIBLE POWER SYSTEMS (UPS) - PART 5-3: METHOD OF SPECIFYING THE PERFORMANCE AND TEST REQUIREMENTS FOR D.C. UPS
    UNE-EN 50556:2011 Road traffic signal systems
    15/30265353 DC : 0 BS EN 62271-1 ED 2 - HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: COMMON SPECIFICATIONS FOR ALTERNATING CURRENT SWITCHGEAR AND CONTROLGEAR
    13/30294866 DC : 0 BS EN 61058-1 - SWITCHES FOR APPLIANCES - PART 1: GENERAL REQUIREMENTS
    BS EN 50274 : 2002 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PROTECTION AGAINST ELECTRIC SHOCK - PROTECTION AGAINST UNINTENTIONAL DIRECT CONTACT WITH HAZARDOUS LIVE PARTS
    I.S. EN 50556:2011 ROAD TRAFFIC SIGNAL SYSTEMS
    BIS IS/IEC 60529 : 2001(R2009) DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (IP CODE)
    NF EN 50491-3 : 2011 GENERAL REQUIREMENTS FOR HOME AND BUILDING ELECTRONIC SYSTEMS (HBES) AND BUILDING AUTOMATION AND CONTROL SYSTEMS (BACS) - PART 3: ELECTRICAL SAFETY REQUIREMENTS
    11/30249063 DC : 0 BS EN 61300-2-53 - FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS - BASIC TEST AND MEASUREMENT PROCEDURES - PART 2-53: TEST - DEGREES OF PROTECTION PROVIDED BY FIBRE OPTIC ENCLOSURES (IP CODES 65 AND 67)
    IEC PAS 62424:2005 Representation of process control engineering requests in P&I diagrams and data exchange between P&ID tools and PCE-CAE tools
    S.R. HD 60364-7-705:2007 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-705: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - AGRICULTURAL AND HORTICULTURAL PREMISES
    CEI EN 61293 : 1997 MARKING ELECTRICAL EQUIPMENT WITH RATINGS RELATED TO ELECTRICAL SUPPLY - SAFETY REQUIREMENTS
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    EN IEC 61058-1 : 2018 SWITCHES FOR APPLIANCES - PART 1: GENERAL REQUIREMENTS (IEC 61058-1:2016)
    I.S. HD 60364-1:2008 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: FUNDAMENTAL PRINCIPLES, ASSESSMENT OF GENERAL CHARACTERISTICS, DEFINITIONS
    13/30266756 DC : 0 BS ISO 18086 - CORROSION OF METALS AND ALLOYS - DETERMINATION OF AC CORROSION - PROTECTION CRITERION
    NF EN 50521 : 2009 AMD 1 2012 CONNECTORS FOR PHOTOVOLTAIC SYSTEMS - SAFETY REQUIREMENTS AND TESTS
    I.S. EN 50274:2002 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PROTECTION AGAINST ELECTRIC SHOCK - PROTECTION AGAINST UNINTENTIONAL DIRECT CONTACT WITH HAZARDOUS LIVE PARTS
    PD IEC TR 62225:2001 GUIDANCE ON TERMS FOR CONNECTORS AND MECHANICAL STRUCTURES IN ELECTRONIC EQUIPMENT
    DIN ISO/TS 16952-1:2007-03 TECHNICAL PRODUCT DOCUMENTATION - REFERENCE DESIGNATION SYSTEM - PART 1: GENERAL APPLICATION RULES
    IEC 60364-5-559:1999 Electrical installations of buildings - Part 5: Selection and erection of electrical equipment - Chapter 55: Other equipment - Section 559: Luminaires and lighting installations
    15/30324828 DC : DRAFT MAY 2015 BS EN 62305-3 ED. 2.0 - PROTECTION AGAINST LIGHTNING - PART 3: PHYSICAL DAMAGE TO STRUCTURES AND LIFE HAZARD
    DIN EN 15280 E : 2013 EVALUATION OF A.C. CORROSION LIKELIHOOD OF BURIED PIPELINES APPLICABLE TO CATHODICALLY PROTECTED PIPELINES
    CEI CLC/TR 50488 : 2007 RAILWAY APPLICATIONS - SAFETY MEASURES FOR PERSONNEL WORKING NEAR OVERHEAD CONTACT LINES
    HD 60364-1:2008/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: FUNDAMENTAL PRINCIPLES, ASSESSMENT OF GENERAL CHARACTERISTICS, DEFINITIONS
    IEC TR 62540:2009 Radio frequency identification (RFID) for stationary lead acid cells and monoblocs - Tentative requirements
    PREN 50443 : DRAFT 2011 EFFECTS OF ELECTROMAGNETIC INTERFERENCE ON PIPELINES CAUSED BY HIGH VOLTAGE A.C. ELECTRIC TRACTION SYSTEMS AND/OR HIGH VOLTAGE A.C. POWER SUPPLY SYSTEMS
    BS EN 61032 : 1998 PROTECTION OF PERSONS AND EQUIPMENT BY ENCLOSURES - PROBES FOR VERIFICATION
    08/30181631 DC : DRAFT APR 2008 BS IEC 60092-509 - ELECTRICAL INSTALLATIONS IN SHIPS - PART 509: OPERATION OF ELECTRICAL INSTALLATIONS
    PD IEC/TR 61912-2:2009 (published 2009-05) Low-voltage switchgear and controlgear. Over-current protective devices Selectivity under over-current conditions
    NF EN 60664-1 : 2007 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 1: PRINCIPLES, REQUIREMENTS AND TESTS
    BIS IS 1401 : 2008 PROTECTION OF PERSONS AND EQUIPMENT BY ENCLOSURES - PROBES FOR VERIFICATION
    VDI 2052-1 : 2017 AIR CONDITIONING - KITCHENS (VDI VENTILATION CODE OF PRACTICE)
    CAN/CSA-C22.2 NO. 60896-21:17 Stationary lead-acid batteries — Part 21: Valve regulated types — Methods of test (Adopted IEC 60896-21:2004, first edition, 2004-02, with Canadian deviations) | Batteries stationnaires au plomb — Partie 21 : Types étanches à soupapes — Méthodes d’essai (norme IEC 60896-21:2004 adoptee, première édition, 2004-02, avec exigences propres au Canada)
    BS EN 60480:2004 (published 2005-08) Guidelines for the checking and treatment of sulphur hexafluoride (SF6) taken from electrical equipment and specification for its re-use