Re: [PSES] Nyloc Nuts

2021-11-17 Thread Chris Wordley 
Ted, John

Thanks for your input.

Chris

> On 15 Nov 2021, at 14:33, John Woodgate  wrote:
> 
> The nylon is under hoop stress, causing friction with the stud. Unless it 
> softens due to temperature, it remains effective. However, if there is any 
> doubt, an all-metal version is available. Do a Web search for 'all-metal 
> friction nuts'.
> 
> ==
> Best wishes John Woodgate OOO-Own Opinions Only
> www.woodjohn.uk 
> Rayleigh, Essex UK
> Istae nunc praetereunt nisi non ubicumque
> 
> 
> 
> On 2021-11-15 14:06, Chris Wordley wrote:
>> Hello
>> 
>> We sometimes come across products that employ a Nyloc nut as the sole means 
>> of securing (preventing accidental loosening of) a protective earth 
>> connection on a threaded stud. 
>> 
>> I’ve heard various views on the acceptability of this type of construction - 
>> some consider it OK provided the temperature is not high enough to cause the 
>> nylon insert to soften, others think that a separate spring/serrated washer 
>> is required since the nylon cannot be depended on in the longer term. 
>> 
>> I’d be interested to hear the views of others, particularly any CB or 
>> similar labs. I failed to uncover any IECEE decisions on this subject. 
>> 
>> Best Regards
>> 
>> Chris 
>> 
>> -
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>> well-used formats), large files, etc.
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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.
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Re: [PSES] Nyloc Nuts

2021-11-15 Thread John Woodgate 
The nylon is under hoop stress, causing friction with the stud. Unless 
it softens due to temperature, it remains effective. However, if there 
is any doubt, an all-metal version is available. Do a Web search for 
'all-metal friction nuts'.


==
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
Istae nunc praetereunt nisi non ubicumque



On 2021-11-15 14:06, Chris Wordley wrote:

Hello

We sometimes come across products that employ a Nyloc nut as the sole 
means of securing (preventing accidental loosening of) a protective 
earth connection on a threaded stud.


I’ve heard various views on the acceptability of this type of 
construction - some consider it OK provided the temperature is not 
high enough to cause the nylon insert to soften, others think that a 
separate spring/serrated washer is required since the nylon cannot be 
depended on in the longer term.


I’d be interested to hear the views of others, particularly any CB or 
similar labs. I failed to uncover any IECEE decisions on this subject.


Best Regards

Chris

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Re: [PSES] [EXTERNAL] [PSES] Nyloc Nuts

2021-11-15 Thread Ted Eckert 
Hello Chris,

Some reviewers might reject the construction without a lock washer for a 
different reason. A split or star-tooth lock washer will cut through paint, 
oxidation, or coatings on a surface giving additional bonding contact. I've had 
reviewers who didn't trust the bonding connection through the threads of the 
nut and stud and insisted of a backup through the mating surface of the base of 
the nut. Please note that I'm not saying that this is the correct 
interpretation. It's only one that I've run into.

I can also imagine objections due to the force needed to put a nyloc nut on in 
the first place. An inexperienced person might not fully tighten the nut as it 
will provide more resistance to tightening as it is screwed further onto the 
stud. I can see it being easier to have the nut not fully tightened as a result.

Again, I'm not stating that these are reasons the construction will get 
rejected. They are just possible objections of a reviewer.

Ted Eckert
The opinions expressed are my own and do not necessarily reflect those of my 
employer.

From: Chris Wordley 
Sent: Monday, November 15, 2021 6:06 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [EXTERNAL] [PSES] Nyloc Nuts

Hello

We sometimes come across products that employ a Nyloc nut as the sole means of 
securing (preventing accidental loosening of) a protective earth connection on 
a threaded stud.

I've heard various views on the acceptability of this type of construction - 
some consider it OK provided the temperature is not high enough to cause the 
nylon insert to soften, others think that a separate spring/serrated washer is 
required since the nylon cannot be depended on in the longer term.

I'd be interested to hear the views of others, particularly any CB or similar 
labs. I failed to uncover any IECEE decisions on this subject.

Best Regards

Chris
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[PSES] Nyloc Nuts

2021-11-15 Thread Chris Wordley 
Hello

We sometimes come across products that employ a Nyloc nut as the sole means of 
securing (preventing accidental loosening of) a protective earth connection on 
a threaded stud. 

I’ve heard various views on the acceptability of this type of construction - 
some consider it OK provided the temperature is not high enough to cause the 
nylon insert to soften, others think that a separate spring/serrated washer is 
required since the nylon cannot be depended on in the longer term. 

I’d be interested to hear the views of others, particularly any CB or similar 
labs. I failed to uncover any IECEE decisions on this subject. 

Best Regards

Chris 


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