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    Iecex International Conference 2017 Shanghai, China: Electrical Installations Design, Selection, Erection

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    khaldoun sami
    This document summarizes the key topics from a presentation on electrical installations in hazardous areas given at the IECEx International Conference 2017 in Shanghai, China. The presentation covered documentation requirements for area classification, equipment certification, installation, and personnel qualifications. It also discussed selection of explosion-protected equipment according to equipment protection levels, types of protection, equipment grouping, temperature class, external influences, and ambient temperature. The presentation provided guidance on protection from dangerous sparking through potential equalization, static electricity limits, and cable requirements for fixed installations.

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    Iecex International Conference 2017 Shanghai, China: Electrical Installations Design, Selection, Erection

    Uploaded by

    khaldoun sami
    56 views55 pages
    This document summarizes the key topics from a presentation on electrical installations in hazardous areas given at the IECEx International Conference 2017 in Shanghai, China. The presentation covered documentation requirements for area classification, equipment certification, installation, and personnel qualifications. It also discussed selection of explosion-protected equipment according to equipment protection levels, types of protection, equipment grouping, temperature class, external influences, and ambient temperature. The presentation provided guidance on protection from dangerous sparking through potential equalization, static electricity limits, and cable requirements for fixed installations.

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    area classification

    Original Title

    hazards

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    This document summarizes the key topics from a presentation on electrical installations in hazardous areas given at the IECEx International Conference 2017 in Shanghai, China. The presentation covered documentation requirements for area classification, equipment certification, installation, and personnel qualifications. It also discussed selection of explosion-protected equipment according to equipment protection levels, types of protection, equipment grouping, temperature class, external influences, and ambient temperature. The presentation provided guidance on protection from dangerous sparking through potential equalization, static electricity limits, and cable requirements for fixed installations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    56 views55 pages

    Iecex International Conference 2017 Shanghai, China: Electrical Installations Design, Selection, Erection

    Uploaded by

    khaldoun sami
    This document summarizes the key topics from a presentation on electrical installations in hazardous areas given at the IECEx International Conference 2017 in Shanghai, China. The presentation covered documentation requirements for area classification, equipment certification, installation, and personnel qualifications. It also discussed selection of explosion-protected equipment according to equipment protection levels, types of protection, equipment grouping, temperature class, external influences, and ambient temperature. The presentation provided guidance on protection from dangerous sparking through potential equalization, static electricity limits, and cable requirements for fixed installations.

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    of 55

    IECEx International Conference 2017

    Shanghai, China

    Electrical Installations
    Design, Selection, Erection
    and Inspection
    IECEx International Conference 2017

    Peter Thurnherr
    Shanghai thuba Electric Co. Ltd., Shanghai (China)
    thuba Ltd., Switzerland

    Convenor MT 60079-14
    Chairman IECEx ExPCC
    Standards

    IEC 60079-14 IEC 60079-17 IEC 60079-19


    4. General requirements
    4.2 Documentation – Site

    ▪ Area classification document


    (see IEC 60079-10-1 and IEC 60079-10-2)
    ▪ Where applicable, gas, or vapour or dust
    classification in relation to the group or subgroup
    of the electrical equipment
    ▪ Temperature class or ignition temperature of the
    gas or vapour involved
    ▪ Where applicable, the material characteristics
    ▪ External influences
    ▪ Ambient temperature
    4.2 Documentation – Equipment

    ▪ Manufacturer’s instruction manual


    ▪ Certificate of Conformity according to the
    standards
    ▪ Information with «Specific conditions for use”, if
    the certificate number has the suffix “X”
    ▪ Descriptive system document for the intrinsically
    safe system
    4.2 Documentation – Equipment

    The following documents are


    available for the identification:

    – Marking
    (according IEC 60079-0)
    – IECEx Certificate of Conformity
    (Online system!)
    – Instruction manual
    (according IEC 60079-0)
    4.2 Documentation – Equipment

    The following documents are


    available for the identification:

    – Marking
    (according IEC 60079-0)
    – Chinese Certificate of Conformity

    – Instruction manual
    (according IEC 60079-0)
    4.2 Documentation – Installation

    ▪ Necessary information to ensure correct


    installation of the equipment
    ▪ Documentation relating to the suitability of the
    equipment
    ▪ The plans showing details of wiring systems
    ▪ Records of selection criteria for cable entry
    systems
    ▪ Drawings and schedules relating to circuit
    identification
    ▪ Records of the initial inspection
    4.2 Documentation – Personnel

    ▪ Evidence of
    personnel competency
    4.3 Initial inspection

    On completion of the erection, initial inspection of


    the equipment and installation shall be carried out in
    accordance with IEC 60079-14.
    4.4 Assurance of conformity of
    equipment

    Equipment with certificate according to the


    IEC 60079 series meets the requirements for
    hazardous areas, when selected and installed in
    accordance with this standard.
    4.4 Assurance of conformity of
    equipment
    4.5 Qualifications of personnel
    (Annex A)

    ▪ General understanding of relevant electrical


    engineering
    ▪ Practical understanding of explosion protection
    principles and techniques
    ▪ Understanding of and ability to read and assess
    engineering drawings
    ▪ Working knowledge and understanding of relevant
    Standards in explosion protection
    ▪ Basic knowledge of quality assurance, including the
    principles of auditing, documentation, traceability
    of measurement, and instrument calibration
    5. Selection of equipment
    5.3 Relationship between equipment
    protection level (EPLs) and zones

    Zones Equipment protection level (EPL)

    0 Ga
    1 Gb and Ga
    2 Gc, Gb and Ga
    5.4.2 Relation between EPLs and
    types of protection

    EPL Type of Protection Code Standard

    Flameproof enclosures db, d IEC 60079-1

    Increased safety eb, e IEC 60079-7

    Gb Intrinsically safe ib IEC 60079-11

    Encapsulation mb IEC 60079-18

    Oil immersion ob, o IEC 60079-6


    5.5 Selection according to
    equipment grouping

    Requested Permissible
    Group Group

    IIA II, IIA, IIB or IIC

    IIB II, IIB or IIC

    IIC II or IIC
    5.6.2 Temperature class

    Allowable
    Temperature class Ignition
    temperature
    required by the temperature of gas
    classes of
    area classification or vapor
    equipment

    T1 > 450°C T1 - T6
    T2 > 300°C T2 - T6
    T3 > 200°C T3 – T6
    T4 > 135°C T4 – T6
    T5 > 100°C T5 – T6
    T6 > 85°C T6
    5.9 Selection to cover external
    influences

    ▪ Thermal effects
    ▪ Chemical effects
    ▪ Mechanical effects
    ▪ Effects of movement and vibration
    ▪ Electrical effects
    ▪ Moisture
    ▪ Ingress of process liquids
    ▪ Corrosion
    5.9 Selection to cover external
    influences
    5.9 Ambient temperature

    Equipment shall normally be designed


    for use in an ambient temperature range between –
    20 ºC and 40 ºC;
    in this case, no additional ambient temperature
    marking is required.
    Example of extended ambient temperature range
    Tamb

    –20 ºC ≤ Tamb ≤ 60 ºC.


    6. Protection from dangerous
    sparking
    6.4 Potential equalization

    The minimum size for bonding conductors for


    the main connection to a protective rail shall be
    at least 6 mm² (based on conductivity of copper) in
    accordance to IEC 60364-5-54 and supplementary
    connections shall be a minimum of 4 mm².
    Consideration should also be given to using larger
    conductors for mechanical strength.
    Connections shall be secure against self loosening
    and shall minimize the risk of corrosion which may
    reduce the effectiveness of connection.
    Excerpt FDIS 60079-0 Edition 7
    6.5 Static electricity

    Limitation of the size of chargeable non-conductive


    surfaces

    Surface [mm2]
    EPL
    IIA IIB IIC

    Ga 5000 2500 400

    Gb 10000 10000 2000

    Gc 10000 10000 2000


    6.5 Static electricity
    9. Wiring systems
    9.3.2 Cables for fixed installations

    Cables shall be:


    ▪ Sheathed with thermoplastic, thermosetting, or
    elastomeric material.
    They shall be circular and compact.
    Any bedding or sheath shall be extruded.
    Fillers, if any, shall be non hygroscopic.
    ▪ Mineral insulated metal sheathed, or
    ▪ Special, e.g. flat cables with appropriate cable
    glands.
    9.3.2 Cable for fixed installations


    9.3.2 Cable for fixed installations


    9.3.2 Cable for fixed installations


    9.3.2 Cables for fixed installations

     
    Please download Part 2 to
    get full presentation

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