• HD 60364-5-51:2009/A12:2017

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    ELECTRICAL INSTALLATIONS OF BUILDINGS - PART 5-51: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - COMMON RULES

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    Published date:  11-08-2017

    Publisher:  European Committee for Standards - Electrical

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

    Foreword
    510 Introduction
    511 Compliance with standards
    512 Operational conditions and external influences
    513 Accessibility
    514 Identification
    515 Prevention of mutual detrimental influence
    516 Measures related to protective conductor currents
    Annex A (informative) - Concise list of external influences
    Annex B (informative) - Interdependence of air temperature,
            relative air humidity and absolute air humidity
    Annex C (normative) - Classification of mechanical conditions
    Annex D (normative) - Classification of macro-environments
    Annex E (informative) - Permissible protective conductor
            currents for equipment
    Annex F (informative) - IEC 60364 - Parts 1 to 6: Restructuring
    Bibliography
    Annex ZA (informative) - External influences
    Annex ZB (informative) - Methods of marking PEN conductors
                             in different countries
    Annex ZC (informative) - Identification of cores
    Annex ZD (normative) - Special national conditions
    Annex ZE (informative) - A-deviations for Denmark

    Abstract - (Show below) - (Hide below)

    Gives common rules for compliance with measures of protection for safety, requirements for proper functioning for intended use of the installation, and requirements appropriate to the external influences foreseen.

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

    Committee TC 64
    Development Note Supersedes HD 384.5.51. (05/2006)
    Document Type Standard
    Publisher European Committee for Standards - Electrical
    Status Current
    Supersedes

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

    I.S. EN 45510-2-9:2008 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-9: ELECTRICAL EQUIPMENT - CABLING SYSTEMS
    UNE-HD 50573.5.57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    EN 60598-1:2015/A1:2018 LUMINAIRES - PART 1: GENERAL REQUIREMENTS AND TESTS
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    I.S. EN 61730-1:2007 PHOTOVOLTAIC (PV) MODULE SAFETY QUALIFICATION - PART 1: REQUIREMENTS FOR CONSTRUCTION
    HD 60364-7-718:2013/A12:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-718: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - COMMUNAL FACILITIES AND WORKPLACES
    HD 60364-7-721:2009/corrigendum:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-721: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - ELECTRICAL INSTALLATIONS IN CARAVANS AND MOTOR CARAVANS
    S.R. HD 60364-7-718:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-718: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - COMMUNAL FACILITIES AND WORKPLACES
    I.S. EN 15869-2:2010 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS
    I.S. HD 60364-4-42:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-42: PROTECTION FOR SAFETY - PROTECTION AGAINST THERMAL EFFECTS
    S.R. HD 60364-6:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 6: VERIFICATION
    I.S. EN 50521:2008 CONNECTORS FOR PHOTOVOLTAIC SYSTEMS - SAFETY REQUIREMENTS AND TESTS
    S.R. HD 60364-4-42:2011 LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-42: PROTECTION FOR SAFETY - PROTECTION AGAINST THERMAL EFFECTS
    I.S. EN 81-20:2014 SAFETY RULES FOR THE CONSTRUCTION AND INSTALLATION OF LIFTS - LIFTS FOR THE TRANSPORT OF PERSONS AND GOODS - PART 20: PASSENGER AND GOODS PASSENGER LIFTS
    S.R. HD 60364-5-53:2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    I.S. HD 60364-5-54:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    I.S. EN 50539-11:2013 LOW-VOLTAGE SURGE PROTECTIVE DEVICES - SURGE PROTECTIVE DEVICES FOR SPECIFIC APPLICATION INCLUDING D.C. - PART 11: REQUIREMENTS AND TESTS FOR SPDS IN PHOTOVOLTAIC APPLICATIONS
    I.S. HD 60364-7-718:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-718: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - COMMUNAL FACILITIES AND WORKPLACES (IEC 60364-7-718:2011 (EQV))
    BS EN 50539-11 : 2013 LOW-VOLTAGE SURGE PROTECTIVE DEVICES - SURGE PROTECTIVE DEVICES FOR SPECIFIC APPLICATION INCLUDING D.C. - PART 11: REQUIREMENTS AND TESTS FOR SPDS IN PHOTOVOLTAIC APPLICATIONS
    BS EN 61730-1 : 2007 PHOTOVOLTAIC (PV) MODULE SAFETY QUALIFICATION - PART 1: REQUIREMENTS FOR CONSTRUCTION
    I.S. HD 60364-7-721:2009 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-721: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - ELECTRICAL INSTALLATIONS IN CARAVANS AND MOTOR CARAVANS
    HD 50573-5-57 : 2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    BS 7671(2008) : 2018 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    BS 7671(2008) : 2008 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    S.R. HD 60364-5-54:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    I.S. HD 60364-7-714:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-714: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - EXTERNAL LIGHTING INSTALLATIONS (IEC 60364-7-714:2011 (EQV))
    I.S. HD 60364-4-444:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-444: PROTECTION FOR SAFETY - PROTECTION AGAINST VOLTAGE DISTURBANCES AND ELECTROMAGNETIC DISTURBANCES
    VDI 3551:2011-01 ELECTROMAGNETIC COMPATIBILITY (EMC) IN BUILDING SERVICES
    UNI EN 81-20 : 2014 SAFETY RULES FOR THE CONSTRUCTION AND INSTALLATION OF LIFTS - LIFTS FOR THE TRANSPORT OF PERSONS AND GOODS - PART 20: PASSENGER AND GOODS PASSENGER LIFTS
    DIN EN 81-20 E : 2014 SAFETY RULES FOR THE CONSTRUCTION AND INSTALLATION OF LIFTS - LIFTS FOR THE TRANSPORT OF PERSONS AND GOODS - PART 20: PASSENGER AND GOODS PASSENGER LIFTS
    17/30356606 DC : 0 BS ISO 8100-1 - LIFTS FOR THE TRANSPORT OF PERSONS AND GOODS - PART 1: SAFETY REQUIREMENTS FOR PASSENGER AND GOODS PASSENGER LIFTS
    BS EN 45510-2-9:2008 Guide for procurement of power station equipment Electrical equipment. Cabling systems
    BS EN 15869-2:2010 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS
    UNE-EN 81-20:2017 Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 20: Passenger and goods passenger lifts
    UNE-EN 50539-11:2013 Low-voltage surge protective devices - Surge protective devices for specific application including d.c. - Part 11: Requirements and tests for SPDs in photovoltaic applications
    BS EN 81-20:2014 SAFETY RULES FOR THE CONSTRUCTION AND INSTALLATION OF LIFTS - LIFTS FOR THE TRANSPORT OF PERSONS AND GOODS - PART 20: PASSENGER AND GOODS PASSENGER LIFTS
    BS EN 50521 : 2009 CONNECTORS FOR PHOTOVOLTAIC SYSTEMS - SAFETY REQUIREMENTS AND TESTS
    UNE-EN 50521:2010 Connectors for photovoltaic systems - Safety requirements and tests
    UNE-HD 60364-5-53:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
    UNE-EN 15869-2:2011 Inland navigation vessels - Electrical shore connection, three phase current 400 V, up to 63 A, 50 Hz - Part 2: Onshore unit, safety requirements
    DIN EN 15869-2:2010-06 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS
    EN 50539-11 : 2013 AMD 1 2014 LOW-VOLTAGE SURGE PROTECTIVE DEVICES - SURGE PROTECTIVE DEVICES FOR SPECIFIC APPLICATION INCLUDING D.C. - PART 11: REQUIREMENTS AND TESTS FOR SPDS IN PHOTOVOLTAIC APPLICATIONS
    BS 7671(2008) : 2018 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    HD 60364-7-714 : 2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-714: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - EXTERNAL LIGHTING INSTALLATIONS (IEC 60364-7-714:2011)
    HD 60364-4-42 : 2011 AMD 1 2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-42: PROTECTION FOR SAFETY - PROTECTION AGAINST THERMAL EFFECTS (IEC 60364-4-42:2010/A1:2014)
    HD 60364-5-54:2011/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    HD 60364-5-53:2015/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    EN 50521:2008/A1:2012 CONNECTORS FOR PHOTOVOLTAIC SYSTEMS - SAFETY REQUIREMENTS AND TESTS
    BS 7671(2008) : 2008 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    HD 60364-6:2016/AC:2017-11 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 6: VERIFICATION (IEC 60364-6:2016/COR1:2017)
    EN 61730-1:2007/A11:2014 PHOTOVOLTAIC (PV) MODULE SAFETY QUALIFICATION - PART 1: REQUIREMENTS FOR CONSTRUCTION (IEC 61730-1:2004, MODIFIED)
    HD 60364-4-444:2010/AC:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-444: PROTECTION FOR SAFETY - PROTECTION AGAINST VOLTAGE DISTURBANCES AND ELECTROMAGNETIC DISTURBANCES
    EN 45510-2-9 : 2008 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-9: ELECTRICAL EQUIPMENT - CABLING SYSTEMS
    EN 15869-2 : 2010 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS
    EN 45510-2-9:2008 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-9: ELECTRICAL EQUIPMENT - CABLING SYSTEMS
    UNI EN 15869-2 : 2010 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE-PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS

    Standards Referencing This Book - (Show below) - (Hide below)

    EN 62262:2002 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code)
    CISPR 14-1:2016 Electromagnetic compatibility - Requirements for household appliances, electric tools and similar apparatus - Part 1: Emission
    EN 60446:2007 BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE INTERFACE, MARKING AND IDENTIFICATION - IDENTIFICATION OF CONDUCTORS BY COLOURS OR ALPHANUMERICS
    CISPR 12:2007+AMD1:2009 CSV Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of off-board receivers
    IEC 60255-22-1:2007 Measuring relays and protection equipment - Part 22-1: Electrical disturbance tests - 1 MHz burst immunity tests
    IEC 60364-5-54:2011 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
    IEC 61024-1:1990 Protection of structures against lightning - Part 1: General principles
    HD 384.5.52 : S1 CORR 1 98 ELECTRICAL INSTALLATIONS OF BUILDINGS - SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - WIRING SYSTEMS
    HD 60364-4-443:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-44: PROTECTION FOR SAFETY - PROTECTION AGAINST VOLTAGE DISTURBANCES AND ELECTROMAGNETIC DISTURBANCES - CLAUSE 443: PROTECTION AGAINST TRANSIENT OVERVOLTAGES OF ATMOSPHERIC ORIGIN OR DUE TO SWITCHING (IEC 60364-4-44:2007/A1:2015, MODIFIED)
    CISPR 13:2009+AMD1:2015 CSV Sound and television broadcast receivers and associated equipment -Radio disturbance characteristics - Limits and methods of measurement
    IEC 60050-691:1973 International Electrotechnical Vocabulary (IEV) - Part 691: Tariffs for electricity
    EN 55013:2013/A1:2016 SOUND AND TELEVISION BROADCAST RECEIVERS AND ASSOCIATED EQUIPMENT - RADIO DISTURBANCE CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT (CISPR 13:2009, MODIFIED)
    IEC 60364-4-41:2005+AMD1:2017 CSV Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
    IEC 60073:2002 Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators
    EN 60073:2002 Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators
    IEC 60884-1:2002+AMD1:2006+AMD2:2013 CSV Plugs and socket-outlets for household and similar purposes - Part1: General requirements
    CISPR 14-2:2015 RLV Electromagnetic compatibility - Requirements for household appliances, electric tools and similar apparatus - Part 2: Immunity - Product family standard
    IEC 60364-5-53:2001+AMD1:2002+AMD2:2015 CSV Electrical installations of buildings - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control
    HD 60364-4-41:2017/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-41: PROTECTION FOR SAFETY - PROTECTION AGAINST ELECTRIC SHOCK
    HD 60364-5-54:2011/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    IEC 60068-2-11:1981 Basic environmental testing procedures - Part 2-11: Tests - Test Ka: Salt mist
    CISPR 15:2013+AMD1:2015 CSV Limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment
    CENELEC GUIDE 29 : 2007 TEMPERATURES OF HOT SURFACES LIKELY TO BE TOUCHED GUIDANCE DOCUMENT FOR TECHNICAL COMMITTEES AND MANUFACTURERS
    IEC 60364-1:2005 Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions
    CISPR 22:2008 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
    HD 60364-4-444:2010/AC:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-444: PROTECTION FOR SAFETY - PROTECTION AGAINST VOLTAGE DISTURBANCES AND ELECTROMAGNETIC DISTURBANCES
    EN 60255-22-1:2008 MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 22-1: ELECTRICAL DISTURBANCE TESTS - 1 MHZ BURST IMMUNITY TESTS
    EN 60447:2004 BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE INTERFACE, MARKING AND IDENTIFICATION - ACTUATING PRINCIPLES
    IEC 61346-1:1996 Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules
    EN 61346-1 : 1996 INDUSTRIAL SYSTEMS, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS - STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS - PART 1: BASIC RULES
    EN 55014-2:2015 ELECTROMAGNETIC COMPATIBILITY - REQUIREMENTS FOR HOUSEHOLD APPLIANCES, ELECTRIC TOOLS AND SIMILAR APPARATUS - PART 2: IMMUNITY - PRODUCT FAMILY STANDARD (CISPR 14-2:2015)
    IEC 60707:1999 Flammability of solid non-metallic materials when exposed to flame sources - List of test methods
    IEC 60447:2004 Basic and safety principles for man-machine interface, marking and identification - Actuating principles
    HD 384.4.42 : S1 AMD 2 ELECTRICAL INSTALLATIONS OF BUILDINGS - PROTECTION FOR SAFETY - PROTECTION AGAINST THERMAL EFFECTS
    HD 308 S2:2001 Identification of cores in cables and flexible cords
    EN 55022:2010/AC:2011 INFORMATION TECHNOLOGY EQUIPMENT - RADIO DISTURBANCE CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT (CISPR 22:2008)
    IEC 60529:1989+AMD1:1999+AMD2:2013 CSV Degrees of protection provided by enclosures (IP Code)
    EN 55011:2016/A1:2017 INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT - RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT (CISPR 11:2015/A1:2016)
    IEC 60364-4-44:2007+AMD1:2015 CSV Low-voltage electrical installations - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances
    IEC 60721-3-0:1984+AMD1:1987 CSV Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Introduction
    IEC 62262:2002 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code)
    IEC 60364-4-443:1995+AMD1:1998 CSV Electrical installations of buildings - Part 4: Protection for safety - Chapter 44: Protection against overvoltages - Section 443: Protection against overvoltages of atmospheric origin or due to switching
    IEC 60721-3-3:1994+AMD1:1995+AMD2:1996 CSV Classification of environmental conditions - Part 3-3: Classification of groups of environmental parameters and their severities - Stationary use at weatherprotected locations
    CISPR 11:2015 RLV Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
    EN 61140:2016 PROTECTION AGAINST ELECTRIC SHOCK - COMMON ASPECTS FOR INSTALLATION AND EQUIPMENT (IEC 61140:2016)
    EN 60068-2-11 : 1999 ENVIRONMENTAL TESTING - TESTS - TEST KA-SALT MIST
    EN 55012:2007/A1:2009 VEHICLES, BOATS AND INTERNAL COMBUSTION ENGINES - RADIO DISTURBANCE CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT FOR THE PROTECTION OF OFF-BOARD RECEIVERS
    EN 60529:1991/AC:2016-12 DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (IP CODE) (IEC 60529 EDITION 2.2 CORRIGENDUM 2:2015)
    IEC 61140:2016 Protection against electric shock - Common aspects for installation and equipment
    IEC 60364-4-42:2010+AMD1:2014 CSV Low-voltage electrical installations - Part 4-42: Protection forsafety - Protection against thermal effects
    EN 60721-3-4:1995/A1:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SECTION 4: STATIONARY USE AT NON-WEATHER-PROTECTED LOCATIONS
    IEC TS 60479-2:2007 Effects of current on human beings and livestock - Part 2: Special aspects
    EN 55014-1:2017 ELECTROMAGNETIC COMPATIBILITY - REQUIREMENTS FOR HOUSEHOLD APPLIANCES, ELECTRIC TOOLS AND SIMILAR APPARATUS - PART 1: EMISSION (CISPR 14-1:2016 + COR1:2016)
    IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems
    EN 60721-3-3 : 95 AMD 2 97 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - STATIONARY USE AT WEATHER-PROTECTED LOCATIONS
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