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Monthly Archives: February 2014

  • Q&A: When Should A Hazardous Area Cable Joint Be Used?

    Question:

    In what situation and applications should I use a Hazardous Area cable joint over a standard resin-filled joint?

    Answer:

    A Hazardous Area joint kit should be used if you have a requirement for your cable jointing solution, to be flame retardant, halogen-free or hydrocarbon resistant.

    All of our 3M Hazardous Area joints have been tested extensively to prove their performance within hazardous and harsh environments and the effects of hydrocarbons and chemical solvents on resins and joint bodies.

    The LVI-3 range of cable joints have been successfully installed within ATEX rated Hazardous Area including mines and quarries, underground applications, petrochemical sites and offshore areas where there is a risk of flame or explosion.

    The specialist joint shell, which is flame retardant, hydrocarbon resistant and halogen free, is filled with a specially designed polyurethane resin, which is a highly modified joint resin mix, which makes the resin flame retardant, halogen free and virtually unaffected by immersion in either hydrocarbon or chemical solvent solutions.

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  • Q&A: Are bushing extenders available for Euromold Interface C bushings?

    Question:

    Are bushing extenders available for the Nexans Euromold Interface 'C' bushings? I have noted extenders are available for Interface D and E bushings but cannot find any examples for the interface C range.

    Answer:

    Unfortunately 400series bushing extenders do not exist. Being a European-designed product, it as always felt that sufficient control could be exerted over equipment manufacturers to negate the need for such a product. Unfortunately that hasn't always worked and Nexans Euromold were forced some years ago to come up with a solution which is:

    - Use a 400series tee connector, i.e. (K)400TB, for which Euromold produce an insulated rod/contact assembly to take the place of the cable which would normally be present.
    - The bushing is then “extended” by using a conventional (K)400CP connecting plus and thread assembly.

    Euromold 400 series bushing extension solution

    Although it doesn't look conventional, it is however the only solution and usually available within a few weeks, from ETS Cable Components.

    Please note that this solution is only valid up to 24kV maximum.

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  • ERICO Perform Fusing Tests on CADWELD Connections

    ERICO, manufacturers of the CADWELD® range of exothermic welding equipment, recently carried out some fusing tests on their CADWELD connections at their HV laboratory in Solon, USA.

    In the tests, 10kA is applied until either the conductor or the CADWELD connection fails. To pass the test, the conductor must fail (melt) before the CADWELD connection does, proving that connections made using the CADWELD system are not the weak point of a grounding system.

    GRC-182Q Fusing Test (cable to ground rod connections)

    Conductors Used: ERICO CADWELD connecting 3/4" (19mm) ground rod to 4/0 (107mm) copper conductor.

    Test Parameters: 10100A RMS 60Hz applied until fusing

    Pass/Fail Criteria: The grounding connector shall not crack, break, or melt when subject to the test current.

    SSC-2Q Fusing Test (cable to cable connection)

    Conductors Used: 4/0 copper conductor to 4/0 copper conductor with ERICO CADWELD

    Test Parameters: 10100A RMS 60Hz applied until fusing

    Pass/Fail Criteria: The grounding connector shall not crack, break, or melt when subject to the test current.

    ERICO also carried out some short-circuit current tests on their tinned copper braid (MBJ) product, in accordance with standard UL467 (Ground and Bonding). In this test 5.9kA is applied for 6.1 seconds. To pass the test, the braid must not fuse (melt) and still be able to carry current afterwards.

    MBJ-50-500-10 Fusing Test (50mm2 tinned copper braid bond)

    Conductors Used: 556980 (MBJ 50 - 500 - 10) tinned copper earth braid (MBJ) 50mm2, 500mm length, 6mm hole.

    Test Parameters: 5960A RMS 60Hz applied for 6.1 seconds

    Pass/Fail Criteria:

    7.5.1 - A grounding or bonding device shall not crack, break, or melt when subject to the current and time specified in the Test Perameters.

    7.5.2 - After having carried the current specified in Clause 7.5.1, continuity shall be maintained on the test sample assembly.

    ETS are the authorised UK stockist and reseller of ERICO CADWELD exothermic welding equipment and can also provide a comprehensive on-site CADWELD PLUS training course, carried out by a fully qualified ETS operative on behalf of ERICO.

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