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  • BS 7798:1998

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    SPECIFICATION FOR INDUSTRIAL IMMERSION HEATERS USING METAL-SHEATHED ELEMENTS

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-1998

    Publisher:  British Standards Institution

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

    Committees responsible
    Foreword
    Specification
    1 Scope
    2 References
    3 Definitions
    4 Heating elements
    5 Rating
    6 Degree of protection
    7 Electrical insulation
    8 Thermal insulation
    9 Construction
    10 Supply connections
    11 Terminations for external conductors
    12 Provision for earthing
    13 Internal wiring
    14 Mounting of components
    15 Screws and connections
    16 Creepage distances, clearances and distances through
        insulation
    17 Controls
    18 Labels and warning notices
    19 Routine testing
    20 Instructions
    21 Marking
    Annexes
    A (normative) Methods of test
    B (informative) Guidance for installation of immersion
        heaters
    Tables
    1 Power output
    2 Minimum thickness of metallic enclosures
    3 Terminal sizes
    4 Fastening strength of terminals
    5 Dimensions of pillar terminals
    6 Dimensions of screw terminals
    7 Dimensions of stud terminals
    8 Minimum spacings
    9 Creepage distances and clearances
    10 Temperature marking for supply connections
    11 Symbols for marking
        A.1 Torque values for screw torque test
        A.2 Torque values for screw torque test, for terminals
              described in 11.2.3 and 11.3.3
    List of references

    Abstract - (Show below) - (Hide below)

    Defines requirements for industrial electric immersion heaters meant to be permanently installed in cylinders or tanks for heating liquids, where the heaters have fixed, replaceable or removable elements. Not applicable to immersion heaters for mounting over the side of tanks, nor to those designed for household use.

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

    Committee PEL/27
    Development Note Supersedes 92/04453 DC (10/2005) Reviewed and confirmed by BSI, December 2009. (11/2009)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

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

    BS EN 60730-1:2011 Automatic electrical controls for household and similar use General requirements
    BS 7671:1992 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS
    BS 5406-2:1988 DISTURBANCES IN SUPPLY SYSTEMS CAUSED BY HOUSEHOLD APPLIANCES AND SIMILAR ELECTRICAL EQUIPMENT - SPECIFICATION OF HARMONICS
    BS 3456-201:1990 Specification for safety of household and similar electrical appliances General requirements
    BS 93:1951 SPECIFICATION FOR BRITISH ASSOCIATION (B.A.) SCREW THREADS WITH TOLERANCES FOR SIZES 0 B.A. TO 16 B.A.
    BS 6004:1991 SPECIFICATION FOR PVC-INSULATED CABLES (NON-ARMOURED) FOR ELECTRIC POWER AND LIGHTING
    BS EN 60439-1:1999 Low-voltage switchgear and controlgear assemblies Type-tested and partially type-tested assemblies
    BS 3535-2:1990 ISOLATING TRANSFORMERS AND SAFETY ISOLATING TRANSFORMERS - SPECIFICATION FOR TRANSFORMERS FOR REDUCED SYSTEM VOLTAGE
    BS 7351:1990 Specification for metal-sheathed heating elements for industrial use
    BS 5406-3:1988 DISTURBANCES IN SUPPLY SYSTEMS CAUSED BY HOUSEHOLD APPLIANCES AND SIMILAR ELECTRICAL EQUIPMENT - SPECIFICATION OF VOLTAGE FLUCTUATIONS
    BS EN 60529:1992+A2:2013 DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (IP CODE)
    BS 3535-1:1990 ISOLATING TRANSFORMERS AND SAFETY ISOLATING TRANSFORMERS - GENERAL REQUIREMENTS
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