Scott,

Thanks for your sharing experience on this matter!  What is the purpose for
the second star washer?  Double protection on top of the first one.  The
star washer is a very essential part for the success of good earth the
metal enclosure.

Regards,

Scott


On Sat, 11 Aug 2018 at 02:11, Scott Douglas <sdouglas...@gmail.com> wrote:

> Many years ago a TUV Engineer drummed into my head "the only acceptable
> way" to make protective earth bonds was chassis > star > ring lug > star >
> nut for ground studs pressed into the chassis.
>
>
> On Fri, Aug 10, 2018, 9:54 AM Scott Xe <scott...@gmail.com> wrote:
>
>> Hi Rich,
>>
>>
>>
>> Thanks for your advice! 😊  Regarding the flat washer, can it be the
>> flat ring lug of the connecting wire instead?
>>
>>
>>
>> Between the screw head and the metal enclosure, do we need a flat
>> washer?  That is to say: screw head -> flat washer -> metal enclosure -> on
>> other side of metal enclosure with paint removed in the contact area with
>> the flat ring lug -> flat ring lug of the earthing wire -> split ring lock
>> washer -> plain nut to establish a good electrical earth connection.
>>
>>
>>
>> Thanks and regards,
>>
>>
>>
>> Scott
>>
>>
>>
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>>
>>
>> *From: *Richard Nute <ri...@ieee.org>
>> *Sent: *Friday, 10 August 2018 03:11 AM
>> *To: *EMC-PSTC@LISTSERV.IEEE.ORG
>> *Subject: *Re: [PSES] External toothed star washer used in earth
>> connection
>>
>>
>>
>>
>>
>> "The lock washer should not interface between the bolt head and the
>> metal, the lock washer should be between the head and a flat washer."
>>
>>
>>
>> That locks the bolt to the flat washer so they turn together.  😊
>>
>>
>>
>> Establishes a good electrical connection between the bolt and the flat
>> washer!  😊
>>
>>
>>
>> Rich
>>
>>
>>
>>
>>
>> -
>> ----------------------------------------------------------------
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>> This message is from the IEEE Product Safety Engineering Society emc-pstc
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>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to &LT;
>> emc-p...@ieee.org&GT;
>>
>> All emc-pstc postings are archived and searchable on the web at:
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>>
>> Attachments are not permitted but the IEEE PSES Online Communities site
>> at http://product-compliance.oc.ieee.org/ can be used for graphics (in
>> well-used formats), large files, etc.
>>
>> Website: http://www.ieee-pses.org/
>> Instructions: http://www.ieee-pses.org/list.html (including how to
>> unsubscribe) <http://www.ieee-pses.org/list.html>
>> List rules: http://www.ieee-pses.org/listrules.html
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>> For help, send mail to the list administrators:
>> Scott Douglas &LT;sdoug...@ieee.org&GT;
>> Mike Cantwell &LT;mcantw...@ieee.org&GT;
>>
>> For policy questions, send mail to:
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>> David Heald &LT;dhe...@gmail.com&GT;
>>
>

-
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All emc-pstc postings are archived and searchable on the web at:
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Attachments are not permitted but the IEEE PSES Online Communities site at 
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Website:  http://www.ieee-pses.org/
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