: August 11, 2018 3:13 AMTo: EMC-PSTC@LISTSERV.IEEE.ORGReply-to: scott...@gmail.comSubject: Re: [PSES] External toothed star washer used in earth connection 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
t; plain nut to establish a good electrical earth connection.
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>> Thanks and regards,
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>> Scott
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>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
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will cut through the paint and establish a gas-tight connection. There is
> no need to remove paint.
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> Best regards,
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> Rich
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> *From:* Scott Xe
> *Sent:* Friday, August 10, 2018 9:54 AM
> *To:* ri...@ieee.org
… a star washer was not acceptable for military grounding. The rationale was
that the points of the star washer created the conductive grounding path. Since
the points were fairly small, and the ground fault current was high, a fault
current would be forced to flow across those tiny point-con
day, August 10, 2018 4:09 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] External toothed star washer used in earth connection
MIL-B-5087 is superseded by MIL-STD-464, which says "Overpainting of structure
for corrosion control prior to ensuring an electrical bond has been documented
The rationale was that the points of the star washer created the conductive
grounding path. Since the points were fairly small, and the ground fault
current was high, a fault current would be forced to flow across those tiny
point-contacts. This had the danger of causing the points to melt
[mailto:ri...@ieee.org]
Sent: Friday, August 10, 2018 2:46 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] External toothed star washer used in earth connection
Hi Scott:
For the sake of this discussion, a toothed star lock washer has two functions:
(1) keep the bolt from loosening, and (2) esta
, August 10, 2018 2:46 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] External toothed star washer used in earth connection
Hi Scott:
For the sake of this discussion, a toothed star lock washer has two functions:
(1) keep the bolt from loosening, and (2) establishing a “good” electrical
remove paint.
Best regards,
Rich
From: Scott Xe
Sent: Friday, August 10, 2018 9:54 AM
To: ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] External toothed star washer used in earth connection
Hi Rich,
Thanks for your advice! 😊 Regarding the flat
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> Scott
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> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
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>
> *From: *Richard Nute
> *Sent: *Friday, 10 August 2018 03:11 AM
> *To: *EMC-PSTC@LISTSERV.IEEE.ORG
> *Subject: *Re: [PSES] External toothed star washer u
ay, 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 th
nesday, August 8, 2018 11:26 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] External toothed star washer used in earth connection
These references are in relation to ship building, but may be of interest to
anybody who wants to look at star tooth washer bonding in detail.
http://www.public.na
"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!
😊
t; *Sent:* August 8, 2018 7:22 AM
> *To:* EMC-PSTC@LISTSERV.IEEE.ORG
> *Reply-to:* scott...@gmail.com
> *Subject:* [PSES] External toothed star washer used in earth connection
>
> Notice that it is common to use external toothed star washer to
> cut through the paint on metal enclosure
;
>
> *From:* Doug Powell [mailto:doug...@gmail.com]
> *Sent:* Wednesday, August 08, 2018 1:04 PM
> *To:* EMC-PSTC@LISTSERV.IEEE.ORG
> *Subject:* Re: [PSES] External toothed star washer used in earth
> connection
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> I have used IPC guidance in the past and while they
day, August 8, 2018 10:30 AM
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: Re: [PSES] External toothed star washer used in earth connection
>
> Am not aware that it is "common to use external toothed star washer to
> cut through the paint". It has been my experience that
e found in the CSA
> engineering manual for 60950-1. And 40A ground bond test for all, and all
> for one.
>
> Brian
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>
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> From: Doug Powell [mailto:doug...@gmail.com]
> Sent: Wednesday, August 08, 2018 10:04 AM
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: Re: [PSES] E
John,
Appropriate torque is different to set due to various connection
mechanism. However you point of double-sided washer is essential. We had
a case that the production incorrectly installed the washer upside-down
causing the failure in earth continuity test.
Thanks and regards,
Scott
On We
etwork
From: scott...@gmail.com
Sent: August 8, 2018 7:22 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Reply-to: scott...@gmail.com
Subject: [PSES] External toothed star washer used in earth connection
Notice that it is common to use external toothed star washer to cut through the
paint on metal enclosure inst
From: scott...@gmail.comSent: August 8, 2018 7:22 AMTo: EMC-PSTC@LISTSERV.IEEE.ORGReply-to: scott...@gmail.comSubject: [PSES] External toothed star washer used in earth connection Notice that
Subject: [PSES] External toothed star washer used in earth connection
Notice that it is common to use external toothed star washer to cut through the
paint on metal enclosure instead of removing the paint for earthing. The
connection effectiveness may be affected with following things
The screw torque is specified in several standards, but the acceptance
criterion is usually the high-current resistance test. It's really up to
the manufacturer of the product to specify the requirements of the
washer, which must be double-sided so that it doesn't matter which way
up it is inst
Notice that it is common to use external toothed star washer to cut through
the paint on metal enclosure instead of removing the paint for earthing.
The connection effectiveness may be affected with following things
- Sharpness of teeth on washer (some toothed washers are single sided
instea
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