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  • BS 6704:1996

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    Code of practice for selection, installation and maintenance of intrinsically safe electrical equipment in coal mines

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  11-15-1996

    Publisher:  British Standards Institution

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

    Committees responsible
    Foreword
    Code of Practice
    Section 1. General
    1.1 Scope
    1.2 References
    1.3 Definitions
    1.4 Information on legislation
    1.5 Information on certification
    1.6 Information on certification of electrical
          apparatus and systems
    1.7 Marking of apparatus certified to BS 5501 Part 7
    Section 2. Selection and installation of electrical
    apparatus and systems
    2.1 Selection
    2.2 Installation
    Section 3. Inspection and testing
    3.1 General
    3.2 Inspection
    3.3 Routine inspection
    3.4 Insulation and earth continuity testing
    3.5 Records
    Section 4. Maintenance and repair
    4.1 General
    4.2 Maintenance work in a hazardous area
    4.3 Maintenance work in a non-hazardous area
    4.4 Cable disconnection
    4.5 Batteries
    4.6 Electrical measuring instruments
    4.7 Repair and overhaul
    Annexes
    A (normative) Competence of personnel
    B (informative) Characteristics of mining type cables
    Tables
    1 Standards dealing with the design, construction and
          testing of electrical apparatus for use in
          hazardous atmospheres
    B.1 Telephone cable inductance and resistance ratios
          (nominal values)
    B.2 Signalling cable inductance and resistance ratios
          (nominal values)
    B.3 Electrical characteristics of pliable wire
          armoured cables to BS 6708:1991 (nominal values)
    B.4 Electrical characteristics of two-core steel wire
          armoured cables to BS 6708:1991 (nominal values)
    Figures
    1 Certification mark
    2 Example of marking of apparatus for connection
          to other apparatus and which does not incorporate
          a power source
    3 Example of marking of a mains driven power supply
          unit contained within a flameproof enclosure
    List of references

    Abstract - (Show below) - (Hide below)

    Includes inspection, testing, maintenance and repair, and competence of personnel in respect of safe practice.

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

    Committee W/-
    Development Note Supersedes 94/705033 DC and BS 6704(1987) (09/2005) Reviewed and confirmed by BSI, January 2011. (12/2010)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

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

    BS 7924:1999 Code of practice for the repair and overhaul of certified electrical apparatus intended for use in mines susceptible to firedamp
    BS 6705:1987 Specification for electrical measuring instruments for use on intrinsically safe circuits in coal mines

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

    BS 6709:1986 Specification for interconnection of electrical apparatus, constructed to two or more British Standards, for use in mines susceptible to firedamp
    BS 6556-1:1985 Low speed digital signals for use in coal mines. Specification for optical coupling
    BS EN 50014:1998 Electrical apparatus for potentially explosive atmospheres. General requirements
    BS 6182-2:1982 Intrinsically safe power supplies for use in coal mines Specification for a.c. power supplies
    BS 6708:1991 Specification for flexible cables for use at mines and quarries
    BS 6346:1989 SPECIFICATION FOR PVC-INSULATED CABLES FOR ELECTRICITY SUPPLY
    BS 6353:1983 Specification for underground loudspeaker communication systems in coal mines
    BS 5501-9:1982 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - SPECIFICATION FOR INTRINSICALLY SAFE ELECTRICAL SYSTEMS 'I'
    BS 5501-4:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - POWDER FILLING 'Q'
    BS 5501-7:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - INTRINSIC SAFETY 'I'
    BS 6556-2:1985 Low speed digital signals for use in coal mines Specification for transformer coupling
    BS 6182-1:1994 Intriniscally safe power supplies for use in coal mines Specification for d.c. power supplies
    BS 7202:1989 Specification for non-incendive low voltage control/interlock and low voltage earth fault monitoring circuits for use in mines
    BS EN 50017:1998 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - POWDER FILLING 'Q'
    BS 5501-6:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - INCREASED SAFETY 'E'
    BS 5501-1:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - GENERAL REQUIREMENTS
    BS 5501-5:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - FLAMEPROOF ENCLOSURE 'D'
    BS EN 50033:1991 Specification for construction and testing of miners' caplamps in relation to the risk of explosion, for mines susceptible to firedamp
    BS 5501-8:1988 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - ENCAPSULATION 'M'
    BS EN 50015:1998 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - OIL IMMERSION 'O'
    BS 5501-2:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - OIL IMMERSION 'O'
    BS 6182-3:1982 Intrinsically safe power supplies for use in coal mines Specification for rechargeable battery units
    BS 5754:1987 Specification for electrical analogue and state signals for use in coal mines
    BS 6556-3:1985 Low speed digital signals for use in coal mines Specification for message protocols
    BS 5501-3:1977 ELECTRICAL APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES - PRESSURIZED APPARATUS 'P'
    BS EN 50020:2002 Electrical apparatus for potentially explosive atmospheres. Intrinsic safety \'i\'
    BS EN 60086-1:2016 Primary batteries General
    1994/9/EC : 1994 DIRECTIVE 94/9/EC OF THE EUROPEAN PARLIAMENT AND THE COUNCIL OF 23 MARCH 1994 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
    BS 6705:1987 Specification for electrical measuring instruments for use on intrinsically safe circuits in coal mines
    BS EN 50018:2000 Electrical apparatus for potentially explosive atmospheres. Flameproof enclosure \'d\'
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