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Intrinsic Safety

Discussion in 'Electrical Engineering' started by BIGEYE, Oct 31, 2005.

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    BIGEYE Guest

    Can anyone point me to a website that demonstrates on how to select the
    correct intrinsic safety barriers to suit instruments and cables (showing
    cable calculations) for an intrinsically safe system design.
    I have googled through many pages, but have been unable to find what I am
    looking for.
  2. SQLit

    SQLit Guest

    intrinsic safe is a huge galaxy. There are no general rules. There are only
    specific requirements.
    Intrinsic safe in a flammable gas atmosphere (hydrogen for example) would be
    some what different than a flammable liquid situation (gasoline for

    Placement, voltages, current, are all considerations and apply.

    Narrow your issue down to a county and maybe we can help
  3. John B Smith

    John B Smith Guest

    A useful reference book in UK is
    Intrinsically Safe Instrumentation: a guide
    by Robin Garside. 3rd Edition Revised 1997.
    Covering this important protection concept in detail, this book explains the
    key criteria including associated apparatus, system selection and design,
    cabling, earthing, certification etc. The use of Simple Apparatus (which may
    be installed without certification) is explained and the procedure for
    assessing systems which do not have system certification is covered in
    325 pages, extensively illustrated. A5 format
    ISBN 0 9516848 1 7


    BIGEYE Guest

    Country UK
    Zone 1
    Gas Classification IIC
    Instrument Supply 24VDC
    Loop Current 4-20mA

    This is an academic exercise that I will need to do for college. Only need
    to look at how we select IS barriers for a particular instrument,
    considering supply voltage, current, etc.
    Then need to select the correct cable, considering cable capacitance based
    on conductor size/cable length, etc.
  5. Take a look at:-

    I hope your college library can give you access to some of the EN500xx
    standards referenced by this document as the finer details will be in those
    documents (probably EN50020, 2002).

    Other things that may be worth searching on are:-

    DSEAR and ATEX.

    Paul E. Bennett ....................<email://>
    Forth based HIDECS Consultancy .....<>
    Mob: +44 (0)7811-639972
    Tel: +44 (0)1235-811095
    Going Forth Safely ....EBA.

    BIGEYE Guest

    404 error
  7. Steve Y

    Steve Y Guest

    Whilst Robin's book is OK, there are also free application notes
    available from

    Don't forget that when choosing a barrier for an application, you need
    to find a barrier/instrument combination that is safe but one that works
    in the way you want it to as well.

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