Re: [PSES] fire safety test methods for different country standards

2016-05-20 Thread Scott Xe 
Hi Rich,

Thanks for your sharing experience!  In general, the users and testing houses 
are referring to the rating of UL yellow card rather than the actual test on 
individual final designed pcb.  Should we use it to object their normal 
practice.  How often is it successful?

Regards,

Scott


> On 21 May 2016, at 10:01 AM, Richard Nute  wrote:
> 
>  
>  
> In my last job I tried to do something similar w.r.t. PWB materials for 
> applications where V-1 or better materials aren’t any good because the 
> retardants result in reduced service lives in hostile equipment environments, 
> whereas some specific (and very special!) HB materials last much longer.
>  
> A PWB with lots of copper will pass the 94V-1 or 94V-0 tests even if the base 
> material is 94HB!  The copper acts as a heat-sink and prevents oxygen from 
> mixing with evolved gasses from the epoxy.  Test in place (vertical or 
> horizontal).  
>  
>  
> Rich
>  
>  
>  
> -
> 
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Re: [PSES] fire safety test methods for different country standards

2016-05-20 Thread Richard Nute 
 

 

In my last job I tried to do something similar w.r.t. PWB materials for 
applications where V-1 or better materials aren’t any good because the 
retardants result in reduced service lives in hostile equipment environments, 
whereas some specific (and very special!) HB materials last much longer.

 

A PWB with lots of copper will pass the 94V-1 or 94V-0 tests even if the base 
material is 94HB!  The copper acts as a heat-sink and prevents oxygen from 
mixing with evolved gasses from the epoxy.  Test in place (vertical or 
horizontal).  

 

 

Rich

 

 

 


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Re: [PSES] EN 55035 / CISPR 35

2016-05-20 Thread Schaefer, David 
There’s a separate question on CISPR 35 I would like answered – are they going 
to use pulse modulation for the spot frequencies?  As Rob mentioned, the 
requirement could be up to 30 V/m. If you’re intended to use the normal AM 
modulation of IEC 61000-4-3, that’s up to 54 V/m during your calibration. Pulse 
modulation makes more sense, but it isn’t in the draft.

David


From: Robert Dunkerley [mailto:robert.dunker...@s-a-m.com]
Sent: Friday, May 20, 2016 7:23 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EN 55035 / CISPR 35

Hi John,

So EN 55035 (CISPR 35) may not filter through to the OJ Harmonised list until 
end of 2019?

Up until that point, it will be a combination of EN 55032 and either EN 55024, 
55020 or 55103-2?

Thanks,

Regards
Rob.


From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: 19 May 2016 13:16
To: Robert Dunkerley; 
EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] EN 55035 / CISPR 35

It is most unlikely that 55035 will be brought into mandatory effect without at 
least 3 years transition. It appears that the CISPR FDIS is forecast for 
October 2016, and CENELEC will for sure need time to process it into an EN.

With best wishes DESIGN IT IN! OOO – Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates 
Rayleigh England

From: Robert Dunkerley [mailto:robert.dunker...@s-a-m.com]
Sent: Thursday, May 19, 2016 12:45 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 55035 / CISPR 35

Hi,

I’m trying to plan ahead for the new EMC Standards coming in next year, in 
particular EN 55032 and EN 55035.

With EN 55035 still in draft form, are we likely to see that become compulsory 
the same time EN 55032 does? (ie 5th March 2017?)

In addition, do we know what the Radiated Immunity test changes are likely to 
be on the final version of the draft? I’ve seen that there is a new requirement 
for spot frequencies at 1.8GHz, 2.6GHz, 3.5GHz and 5GHz @ 3V/m. However, I have 
also seen talk of a ‘Protection Distance’ which could increase this 3V/m up to 
30V/m.

Best regards,

Rob.



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Re: [PSES] EN 55035 / CISPR 35

2016-05-20 Thread Robert Dunkerley 
Hi John,

So EN 55035 (CISPR 35) may not filter through to the OJ Harmonised list until 
end of 2019?

Up until that point, it will be a combination of EN 55032 and either EN 55024, 
55020 or 55103-2?

Thanks,

Regards
Rob.


From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: 19 May 2016 13:16
To: Robert Dunkerley; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] EN 55035 / CISPR 35

It is most unlikely that 55035 will be brought into mandatory effect without at 
least 3 years transition. It appears that the CISPR FDIS is forecast for 
October 2016, and CENELEC will for sure need time to process it into an EN.

With best wishes DESIGN IT IN! OOO – Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates 
Rayleigh England

From: Robert Dunkerley [mailto:robert.dunker...@s-a-m.com]
Sent: Thursday, May 19, 2016 12:45 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 55035 / CISPR 35

Hi,

I’m trying to plan ahead for the new EMC Standards coming in next year, in 
particular EN 55032 and EN 55035.

With EN 55035 still in draft form, are we likely to see that become compulsory 
the same time EN 55032 does? (ie 5th March 2017?)

In addition, do we know what the Radiated Immunity test changes are likely to 
be on the final version of the draft? I’ve seen that there is a new requirement 
for spot frequencies at 1.8GHz, 2.6GHz, 3.5GHz and 5GHz @ 3V/m. However, I have 
also seen talk of a ‘Protection Distance’ which could increase this 3V/m up to 
30V/m.

Best regards,

Rob.



This email has been scanned for email related threats and delivered safely by 
Mimecast.
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