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Earth Bonding Points - Use of 'Double Nutting' or 'Jam Nuts'

Toby Lewis
Hi,


We have earth bonding points on our electronic enclosures and the general opinion is that the use of 'double nutting' or a second locking nut on an earth bonding stud is considered good practice (even where a coil or shakeprook washer is provided).


Problem is no-one that I talk to can find any evidence for the practice of double nutting or a standard or 'good practice' guidelines to hang this on.


Can anyone on this forum provide any information about a standard or code of practice/guidelines that state this?


Many thanks,


TL
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    Toby,

    I am not so familiar with BS 7671 as I am involved in the marine industry where it is not applicable as other standards apply. However the Lloyd's Register Rules and Regulations (and presumably other Classification Society requirements) contain a requirement which states:
    All nuts and screws and clamping devices used in connection with current-carrying, supporting and working parts are to be provided with means to ensure that they cannot work loose by vibration and shock as arise in normal practice.


    You may find similar requirements which apply to the enclosures you are dealing with in the applicable standards.

    Alasdair
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  • 0
    Toby,

    I am not so familiar with BS 7671 as I am involved in the marine industry where it is not applicable as other standards apply. However the Lloyd's Register Rules and Regulations (and presumably other Classification Society requirements) contain a requirement which states:
    All nuts and screws and clamping devices used in connection with current-carrying, supporting and working parts are to be provided with means to ensure that they cannot work loose by vibration and shock as arise in normal practice.


    You may find similar requirements which apply to the enclosures you are dealing with in the applicable standards.

    Alasdair
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