Re: [PSES] Slip Rings and EMI

[Bill Owsley]

We've had an intermittent one recently during development. Running Gigabit 
Ethernet across it and USB too.  Otherwise it runs ok.




 From: John Woodgate 
To: EMC-PSTC@LISTSERV.IEEE.ORG 
Sent: Thursday, May 3, 2012 1:35 PM
Subject: Re: Slip Rings and EMI
 
In message 
, dated 
Thu, 3 May 2012, "David Carney (Neenah)"  writes:

> We?re considering a slip ring in a design to pass some wires through a 
> rotating motor shaft, and we have never used one before.  Are there any EMI 
> concerns with this architecture? 

How much current and source voltage? This is critical, as different 
considerations apply according to these values.

> If there are concerns, what types of mitigations are used for EMI when slip 
> rings are used? 

It can be a matter of 'art' - choosing the right brush and ring materials. 
Consult a brush manufacturer, e.g. Morgan.

> If slip rings are to be avoided for certain types of signals due to EMI 
> concerns, what other alternatives should we consider?

Rotary transformer, as in VHS VCRs.
-- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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Re: [PSES] Troubleshooting Kit (Part 1) Published

[Oscar Fallah]

Hi Ken,

The kit you have described is very useful for EMC road warriors.  Thanks
you.  You have captured and organized most every tool that an EMC engineer
needs for everyday emissions troubleshooting in this article. I have used
all these tools for troubleshooting, and plan on making a couple of these
kits for EMC engineers in my team. Look forward to your article on the
immunity troubleshooting kit.

Thanks,
Oscar Fallah

On Thu, May 31, 2012 at 8:33 PM, Ken Wyatt  wrote:

> Hi All,
>
> I just published a few details on an EMC troubleshooting kit I use. Part 1
> provides some detail on the emission tools I use. Part 2 (to be published
> later) will describe a few immunity tools. I'd appreciate any other
> thoughts or ideas you might have on tools you might use for
> troubleshooting. Please check it out and reply with your ideas on the Test
> & Measurement World blog site 
> here
> ...
>
> Cheers and have a great weekend!
>
> Ken
>   ___
> Kenneth Wyatt
> Wyatt Technical Services LLC
> Woodland Park, CO
> Email Me!  | Web Site 
>  | Blog 
> Subscribe to 
> Newsletter
> Connect with me on LinkedIn 
>
> -
> 
>
> 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 <
> emc-p...@ieee.org>
>
> All emc-pstc postings are archived and searchable on the web at:
> http://www.ieee-pses.org/emc-pstc.html
>
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> http://product-compliance.oc.ieee.org/ can be used for graphics (in
> well-used formats), large files, etc.
>
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>
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> Mike Cantwell 
>
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>

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[PSES] Troubleshooting Kit (Part 1) Published

[Ken Wyatt]

Hi All,

I just published a few details on an EMC troubleshooting kit I use. Part 1 
provides some detail on the emission tools I use. Part 2 (to be published 
later) will describe a few immunity tools. I'd appreciate any other thoughts or 
ideas you might have on tools you might use for troubleshooting. Please check 
it out and reply with your ideas on the Test & Measurement World blog site 
here...

Cheers and have a great weekend!

Ken
___
Kenneth Wyatt
Wyatt Technical Services LLC
Woodland Park, CO
Email Me! | Web Site | Blog
Subscribe to Newsletter
Connect with me on LinkedIn


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Re: [PSES] 120VAC in Europe?

[John Allen]

And don't forget that there are still quite a lot of US military bases
around Europe where 120Vac may be available - Possibly no CE either! J

 

John

 

From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Amund Westin
Sent: 31 May 2012 11:08
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: 120VAC in Europe?

 

Any country in EU who use 120VAC? I don't think so, but want to check with
you guys ..

 

#Amund

 

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[PSES] Fwd: ISO questionnaire

[Doug Nix]

Colleagues,

ISO TC199 Safety of Machinery is working on revisions to ISO 13849-1 and the 
merger of this standard with IEC 62061. The Joint Working Group is looking for 
feedback from users of these and other functional safety standards on how they 
use these standards and the challenges they face in using them. If you use 
these standards and wouldn't mind taking a few minutes to complete this short 
survey, your input will help to guide the TC in revising and merging the 
standards.

> You can complete the survey online att:
> https://docs.google.com/spreadsheet/viewform?formkey=dGRnVnlBT3RDMVhFSXlYc2ZOSVltQWc6MQ

> or in French at:
> https://docs.google.com/spreadsheet/viewform?formkey=dFNyMjJJTkVtTHVmXzkzMnp2ZWItZ0E6MA


Regards,

Doug Nix
H: (519) 650-5979
M: (519) 729-5704 
F: (519) 653-1318

email: d...@ieee.org

Request a meeting: http://tungle.me/dougnix

Find me LinkedIn at http://www.linkedin.com/in/dougnix







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Re: [PSES] EN 60950-1 INaccessible parts

[ce-test, qualified testing bv - Gert Gremmen]

That is what I thought first too.

But that is not true. If there are earthed

conductors on board (not GND, earthed)

connected to  inaccessible part(s) (so accessible also I presume)

clearances are required to table 2N , for the best conditions

that is 0.2 mm (all ic packages comply).

 

This condition is triggered by the chapter on abnormal operation

spec. 5.3.4a, with alternates b) and c) .

 

Please comments !!!

 

Gert

 

 

 

Van: doug...@gmail.com [mailto:doug...@gmail.com] 
Verzonden: Thursday, May 31, 2012 2:30 PM
Aan: ce-test, qualified testing bv - Gert Gremmen;
EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] EN 60950-1 INaccessible parts

 

Gert,

It would seem a motherboard is SELV circuitry and not subject to
functional spacings or a dielectric test. Or am I misunderstanding your
application?


Doug

Douglas E Powell
doug...@gmail.com  
http://www.linkedin.com/in/dougp01  

Sent from my Verizon Wireless BlackBerry



From: "ce-test, qualified testing bv - Gert Gremmen"
mailto:g.grem...@cetest.nl> > 

Date: Thu, 31 May 2012 11:26:45 +0200

To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG> >

ReplyTo: "ce-test, qualified testing bv - Gert Gremmen"
mailto:g.grem...@cetest.nl> > 

Subject: Re: [PSES] EN 60950-1 INaccessible parts

 

Hi Kevin,

 

Thanks,

 

This means that for a PC (secondary GND is  Earthed)

all SECONDARY circuits  not GND must meet

1.   functional clearance and creepage to GND as per table 2M and or
2N, or

2.  withstand the 500 Vac (or higher) dielectrical test, or

3.  be short circuit safe as in 5.3.4c

 

1 and 2 will probably fail on  a motherboard, on many places...

 

How compliance will be achieved there ?

 

 

 

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl

www.cetest.nl


Kiotoweg 363

3047 BG Rotterdam

T 31(0)104152426
F 31(0)104154953

 

Van: Kevin Richardson [mailto:kevin.richard...@ieee.org
 ] 
Verzonden: Thursday, May 31, 2012 11:11 AM
Aan: ce-test, qualified testing bv - Gert Gremmen;
EMC-PSTC@LISTSERV.IEEE.ORG  
Onderwerp: RE: [PSES] EN 60950-1 INaccessible parts

 

Hi Gert,

 

Remember that clause 5.3.4 deals with 'functional insulation' only.

 

It talks about the insulation between a SECONDARY CIRCUIT and an
'inaccessible' conductive part that is earthed for functional reasons.
There needs to be some insulation where the inaccessible conductive part
is earthed.  If this were an earthed  'accessible' conductive part it
certainly cannot be just 'functional' insulation between it and a
SECONDARY CIRCUIT.

 

In terms of 5.3.4 c), as I understand it, clause 5.3.4 gives you a
choice of how to meet the functional insulation requirement, i.e. either
a) or b) or c).  Option c) can be chosen if it is likely that if by
short-circuiting the SECONDARY CIRCUIT to an inaccessible conductive
part either overheating or thermal damage may occur as per the two dot
points in 5.3.4 c), then you can choose option c).  If you so choose
option c) then clause 5.3.9 details the criteria to determine compliance
with  5.3.4 c).

 

Best regards, 
Kevin Richardson 

Stanimore Pty Limited 
Compliance Advice & Solutions for Technology 
(Legislation/Regulations/Standards/Australian Agent Services) 
Ph:   02-4329-4070   (Int'l: +61-2-4329-4070) 
Fax:  02-4328-5639   (Int'l: +61-2-4328-5639) 
Mobile:  04-1224-1620   (Int'l: +61-4-1224-1620) 
Email:kevin.richard...@stanimore.comor
kevin.richard...@ieee.org 
URL: www.stanimore.com 

Confidentiality 
This material (this email including all attachments) may contain
confidential and/or privileged information intended to be read or used
by the addressees only.  If you are not one of the intended recipients
or you have received this material in error, any copying, disclosure,
distribution, use of or reliance upon this material is prohibited.
Please immediately notify Stanimore Pty Limited and delete/destroy all
copies (electronic and hardcopy) of this email and all attachments.
While the sender tries to ensure the accuracy of the information
contained in this material, Stanimore take no responsibility for any
actions taken as a result of receiving this material or for any
consequence of its use.

 

From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl] 
Sent: Thursday, 31 May 2012 5:43 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 60950-1 INaccessible parts

 

Anyone aware of what seems as a typo to me

in EN 60950-1:2006  in par 5.3.4 

 

it say that clearance and creepage distances for functional isolation

must be respected for INaccessible parts ...

 

Whats the sense of guarding the isolation to not accessible parts 

 

 

At the same time, anyone understands what means 5.3.4c

 

they are short-circuited when  a short circuit could cause..

 

well, that seems

Re: [PSES] EN 60950-1 INaccessible parts

[Doug Powell]

Gert,

It would seem a motherboard is SELV circuitry and not subject to functional 
spacings or a dielectric test.  Or am I misunderstanding your application?


Doug

Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01


Sent from my Verizon Wireless BlackBerry

-Original Message-
From: "ce-test, qualified testing bv - Gert Gremmen"
  
Date: Thu, 31 May 2012 11:26:45 
To: 
Reply-To: "ce-test, qualified testing bv - Gert Gremmen"
  
Subject: Re: [PSES] EN 60950-1 INaccessible parts

Hi Kevin,

 

Thanks,

 

This means that for a PC (secondary GND is  Earthed)

all SECONDARY circuits  not GND must meet

1.   functional clearance and creepage to GND as per table 2M and or
2N, or

2.  withstand the 500 Vac (or higher) dielectrical test, or

3.  be short circuit safe as in 5.3.4c

 

1 and 2 will probably fail on  a motherboard, on many places...

 

How compliance will be achieved there ?

 

 

 

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl  

www.cetest.nl


Kiotoweg 363

3047 BG Rotterdam

T 31(0)104152426
F 31(0)104154953

 

Van: Kevin Richardson [mailto:kevin.richard...@ieee.org] 
Verzonden: Thursday, May 31, 2012 11:11 AM
Aan: ce-test, qualified testing bv - Gert Gremmen;
EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: RE: [PSES] EN 60950-1 INaccessible parts

 

Hi Gert,

 

Remember that clause 5.3.4 deals with 'functional insulation' only.

 

It talks about the insulation between a SECONDARY CIRCUIT and an
'inaccessible' conductive part that is earthed for functional reasons.
There needs to be some insulation where the inaccessible conductive part
is earthed.  If this were an earthed  'accessible' conductive part it
certainly cannot be just 'functional' insulation between it and a
SECONDARY CIRCUIT.

 

In terms of 5.3.4 c), as I understand it, clause 5.3.4 gives you a
choice of how to meet the functional insulation requirement, i.e. either
a) or b) or c).  Option c) can be chosen if it is likely that if by
short-circuiting the SECONDARY CIRCUIT to an inaccessible conductive
part either overheating or thermal damage may occur as per the two dot
points in 5.3.4 c), then you can choose option c).  If you so choose
option c) then clause 5.3.9 details the criteria to determine compliance
with  5.3.4 c).

 

Best regards, 
Kevin Richardson 

Stanimore Pty Limited 
Compliance Advice & Solutions for Technology 
(Legislation/Regulations/Standards/Australian Agent Services) 
Ph:   02-4329-4070   (Int'l: +61-2-4329-4070) 
Fax:  02-4328-5639   (Int'l: +61-2-4328-5639) 
Mobile:  04-1224-1620   (Int'l: +61-4-1224-1620) 
Email:kevin.richard...@stanimore.comor
kevin.richard...@ieee.org 
URL: www.stanimore.com 

Confidentiality 
This material (this email including all attachments) may contain
confidential and/or privileged information intended to be read or used
by the addressees only.  If you are not one of the intended recipients
or you have received this material in error, any copying, disclosure,
distribution, use of or reliance upon this material is prohibited.
Please immediately notify Stanimore Pty Limited and delete/destroy all
copies (electronic and hardcopy) of this email and all attachments.
While the sender tries to ensure the accuracy of the information
contained in this material, Stanimore take no responsibility for any
actions taken as a result of receiving this material or for any
consequence of its use.

 

From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl] 
Sent: Thursday, 31 May 2012 5:43 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 60950-1 INaccessible parts

 

Anyone aware of what seems as a typo to me

in EN 60950-1:2006  in par 5.3.4 

 

it say that clearance and creepage distances for functional isolation

must be respected for INaccessible parts ...

 

Whats the sense of guarding the isolation to not accessible parts 

 

 

At the same time, anyone understands what means 5.3.4c

 

they are short-circuited when  a short circuit could cause..

 

well, that seems evident, sounds like " green grass "  to me:

a pleonasm thus.

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl  

www.cetest.nl

 

 

-


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[PSES] SV: [PSES] SV: 120VAC in Europe?

[Amund Westin]

Charlie

 

RTTE here .

 

EMC, radio and LVD tests will be carried out, but we have only planned to do
with EUT in 230VAC mode, since we're only doing CE mark for this EUT.

 

#Amund

 

Fra: Charlie Blackham [mailto:char...@sulisconsultants.com] 
Sendt: 31. mai 2012 12:36
Til: amund; EMC-PSTC@LISTSERV.IEEE.ORG
Emne: RE: [PSES] SV: 120VAC in Europe?

 

Amund


Depends on Directive - Medical Devices covered by EN60601 have to have some
tests done at both voltages.

 

Regards

Charlie

 

From: Amund Westin [mailto:am...@westin-emission.no] 
Sent: 31 May 2012 11:26
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] SV: 120VAC in Europe?

 

So, for CE marking, 110-120VAC should be tested in addition to 230VAC?

 

The EUT has a switch to choose 120VAC or 230VAC supply voltage.

 

#Amund

 

Fra: Nick Williams [mailto:nick.willi...@conformance.co.uk] 
Sendt: 31. mai 2012 12:18
Til: amund
Kopi: EMC-PSTC@LISTSERV.IEEE.ORG
Emne: Re: 120VAC in Europe?

 

110V supplied from a centre tapped to earth isolating transformer is
commonly used on construction and industrial sites in the UK. 

 

Nick. 

 

 

 

On 31 May 2012, at 11:07, Amund Westin wrote:

 

Any country in EU who use 120VAC? I don't think so, but want to check with
you guys ..

 

#Amund

 

 

-


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Re: [PSES] SV: 120VAC in Europe?

[Charlie Blackham]

Amund

Depends on Directive - Medical Devices covered by EN60601 have to have some 
tests done at both voltages.

Regards
Charlie

From: Amund Westin [mailto:am...@westin-emission.no]
Sent: 31 May 2012 11:26
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] SV: 120VAC in Europe?

So, for CE marking, 110-120VAC should be tested in addition to 230VAC?

The EUT has a switch to choose 120VAC or 230VAC supply voltage.

#Amund

Fra: Nick Williams [mailto:nick.willi...@conformance.co.uk]
Sendt: 31. mai 2012 12:18
Til: amund
Kopi: EMC-PSTC@LISTSERV.IEEE.ORG
Emne: Re: 120VAC in Europe?

110V supplied from a centre tapped to earth isolating transformer is commonly 
used on construction and industrial sites in the UK.

Nick.



On 31 May 2012, at 11:07, Amund Westin wrote:

Any country in EU who use 120VAC? I don't think so, but want to check with you 
guys 

#Amund


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Re: [PSES] 120VAC in Europe?

[Nick Williams]

Only for equipment intended for the industrial/construction sites where this 
voltage are used (mainly lighting and portable tools). 

Nick. 


On 31 May 2012, at 11:25, Amund Westin wrote:

> So, for CE marking, 110-120VAC should be tested in addition to 230VAC?
>  
> The EUT has a switch to choose 120VAC or 230VAC supply voltage.
>  
> #Amund
>  
> Fra: Nick Williams [mailto:nick.willi...@conformance.co.uk] 
> Sendt: 31. mai 2012 12:18
> Til: amund
> Kopi: EMC-PSTC@LISTSERV.IEEE.ORG
> Emne: Re: 120VAC in Europe?
>  
> 110V supplied from a centre tapped to earth isolating transformer is commonly 
> used on construction and industrial sites in the UK. 
>  
> Nick. 
>  
>  
>  
> On 31 May 2012, at 11:07, Amund Westin wrote:
> 
> 
> Any country in EU who use 120VAC? I don’t think so, but want to check with 
> you guys ….
>  
> #Amund
>  
>  

Nick Williams
Director
Direct line: +44 1298 873811
Mobile: +44 7702 995135
email: nick.willi...@conformance.co.uk

-

Conformance Ltd - Product safety, approvals and CE-marking consultants
The Old Methodist Chapel, Great Hucklow, Buxton, SK17 8RG England
Tel. +44 1298 873800, Fax. +44 1298 873801, www.conformance.co.uk
Registered in England, Company No. 3478646


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[PSES] SV: 120VAC in Europe?

[Amund Westin]

So, for CE marking, 110-120VAC should be tested in addition to 230VAC?

 

The EUT has a switch to choose 120VAC or 230VAC supply voltage.

 

#Amund

 

Fra: Nick Williams [mailto:nick.willi...@conformance.co.uk] 
Sendt: 31. mai 2012 12:18
Til: amund
Kopi: EMC-PSTC@LISTSERV.IEEE.ORG
Emne: Re: 120VAC in Europe?

 

110V supplied from a centre tapped to earth isolating transformer is
commonly used on construction and industrial sites in the UK. 

 

Nick. 

 

 

 

On 31 May 2012, at 11:07, Amund Westin wrote:





Any country in EU who use 120VAC? I don't think so, but want to check with
you guys ..

 

#Amund

 

 


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Re: [PSES] 120VAC in Europe?

[Nick Williams]

110V supplied from a centre tapped to earth isolating transformer is commonly 
used on construction and industrial sites in the UK. 

Nick. 



On 31 May 2012, at 11:07, Amund Westin wrote:

> Any country in EU who use 120VAC? I don’t think so, but want to check with 
> you guys ….
>  
> #Amund
> 


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Re: [PSES] 120VAC in Europe?

[Carpentier Kristiaan]

Officialy not, but some old houses still have 130VAC

Best regards,
Kris Carpentier

From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Amund Westin
Sent: donderdag 31 mei 2012 12:08
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: 120VAC in Europe?

Any country in EU who use 120VAC? I don't think so, but want to check with you 
guys 

#Amund

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[PSES] 120VAC in Europe?

[Amund Westin]

Any country in EU who use 120VAC? I don't think so, but want to check with
you guys ..

 

#Amund


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Re: [PSES] EN 60950-1 INaccessible parts

[ce-test, qualified testing bv - Gert Gremmen]

Hi Kevin,

 

Thanks,

 

This means that for a PC (secondary GND is  Earthed)

all SECONDARY circuits  not GND must meet

1.   functional clearance and creepage to GND as per table 2M and or
2N, or

2.  withstand the 500 Vac (or higher) dielectrical test, or

3.  be short circuit safe as in 5.3.4c

 

1 and 2 will probably fail on  a motherboard, on many places...

 

How compliance will be achieved there ?

 

 

 

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl  

www.cetest.nl


Kiotoweg 363

3047 BG Rotterdam

T 31(0)104152426
F 31(0)104154953

 

Van: Kevin Richardson [mailto:kevin.richard...@ieee.org] 
Verzonden: Thursday, May 31, 2012 11:11 AM
Aan: ce-test, qualified testing bv - Gert Gremmen;
EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: RE: [PSES] EN 60950-1 INaccessible parts

 

Hi Gert,

 

Remember that clause 5.3.4 deals with 'functional insulation' only.

 

It talks about the insulation between a SECONDARY CIRCUIT and an
'inaccessible' conductive part that is earthed for functional reasons.
There needs to be some insulation where the inaccessible conductive part
is earthed.  If this were an earthed  'accessible' conductive part it
certainly cannot be just 'functional' insulation between it and a
SECONDARY CIRCUIT.

 

In terms of 5.3.4 c), as I understand it, clause 5.3.4 gives you a
choice of how to meet the functional insulation requirement, i.e. either
a) or b) or c).  Option c) can be chosen if it is likely that if by
short-circuiting the SECONDARY CIRCUIT to an inaccessible conductive
part either overheating or thermal damage may occur as per the two dot
points in 5.3.4 c), then you can choose option c).  If you so choose
option c) then clause 5.3.9 details the criteria to determine compliance
with  5.3.4 c).

 

Best regards, 
Kevin Richardson 

Stanimore Pty Limited 
Compliance Advice & Solutions for Technology 
(Legislation/Regulations/Standards/Australian Agent Services) 
Ph:   02-4329-4070   (Int'l: +61-2-4329-4070) 
Fax:  02-4328-5639   (Int'l: +61-2-4328-5639) 
Mobile:  04-1224-1620   (Int'l: +61-4-1224-1620) 
Email:kevin.richard...@stanimore.comor
kevin.richard...@ieee.org 
URL: www.stanimore.com 

Confidentiality 
This material (this email including all attachments) may contain
confidential and/or privileged information intended to be read or used
by the addressees only.  If you are not one of the intended recipients
or you have received this material in error, any copying, disclosure,
distribution, use of or reliance upon this material is prohibited.
Please immediately notify Stanimore Pty Limited and delete/destroy all
copies (electronic and hardcopy) of this email and all attachments.
While the sender tries to ensure the accuracy of the information
contained in this material, Stanimore take no responsibility for any
actions taken as a result of receiving this material or for any
consequence of its use.

 

From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl] 
Sent: Thursday, 31 May 2012 5:43 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 60950-1 INaccessible parts

 

Anyone aware of what seems as a typo to me

in EN 60950-1:2006  in par 5.3.4 

 

it say that clearance and creepage distances for functional isolation

must be respected for INaccessible parts ...

 

Whats the sense of guarding the isolation to not accessible parts 

 

 

At the same time, anyone understands what means 5.3.4c

 

they are short-circuited when  a short circuit could cause..

 

well, that seems evident, sounds like " green grass "  to me:

a pleonasm thus.

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl  

www.cetest.nl

 

 

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Re: [PSES] EN 60950-1 INaccessible parts

[Kevin Richardson]

Hi Gert,

 

Remember that clause 5.3.4 deals with 'functional insulation' only.

 

It talks about the insulation between a SECONDARY CIRCUIT and an
'inaccessible' conductive part that is earthed for functional reasons.
There needs to be some insulation where the inaccessible conductive part is
earthed.  If this were an earthed  'accessible' conductive part it certainly
cannot be just 'functional' insulation between it and a SECONDARY CIRCUIT.

 

In terms of 5.3.4 c), as I understand it, clause 5.3.4 gives you a choice of
how to meet the functional insulation requirement, i.e. either a) or b) or
c).  Option c) can be chosen if it is likely that if by short-circuiting the
SECONDARY CIRCUIT to an inaccessible conductive part either overheating or
thermal damage may occur as per the two dot points in 5.3.4 c), then you can
choose option c).  If you so choose option c) then clause 5.3.9 details the
criteria to determine compliance with  5.3.4 c).

 

Best regards, 
Kevin Richardson 

Stanimore Pty Limited 
Compliance Advice & Solutions for Technology 
(Legislation/Regulations/Standards/Australian Agent Services) 
Ph:   02-4329-4070   (Int'l: +61-2-4329-4070) 
Fax:  02-4328-5639   (Int'l: +61-2-4328-5639) 
Mobile:  04-1224-1620   (Int'l: +61-4-1224-1620) 
Email:kevin.richard...@stanimore.comorkevin.richard...@ieee.org 
URL: www.stanimore.com 

Confidentiality 
This material (this email including all attachments) may contain
confidential and/or privileged information intended to be read or used by
the addressees only.  If you are not one of the intended recipients or you
have received this material in error, any copying, disclosure, distribution,
use of or reliance upon this material is prohibited.  Please immediately
notify Stanimore Pty Limited and delete/destroy all copies (electronic and
hardcopy) of this email and all attachments.  While the sender tries to
ensure the accuracy of the information contained in this material, Stanimore
take no responsibility for any actions taken as a result of receiving this
material or for any consequence of its use.

 

From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl] 
Sent: Thursday, 31 May 2012 5:43 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] EN 60950-1 INaccessible parts

 

Anyone aware of what seems as a typo to me

in EN 60950-1:2006  in par 5.3.4 

 

it say that clearance and creepage distances for functional isolation

must be respected for INaccessible parts .

 

Whats the sense of guarding the isolation to not accessible parts 

 

 

At the same time, anyone understands what means 5.3.4c

 

they are short-circuited when  a short circuit could cause..

 

well, that seems evident, sounds like " green grass "  to me:

a pleonasm thus.

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

  g.grem...@cetest.nl

www.cetest.nl

 

 

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[PSES] EN 60950-1 INaccessible parts

[ce-test, qualified testing bv - Gert Gremmen]

Anyone aware of what seems as a typo to me

in EN 60950-1:2006  in par 5.3.4 

 

it say that clearance and creepage distances for functional isolation

must be respected for INaccessible parts ...

 

Whats the sense of guarding the isolation to not accessible parts 

 

 

At the same time, anyone understands what means 5.3.4c

 

they are short-circuited when  a short circuit could cause..

 

well, that seems evident, sounds like " green grass "  to me:

a pleonasm thus.

 

Regards,

Ing.  Gert Gremmen, BSc

 

 

 

g.grem...@cetest.nl  

www.cetest.nl

 

 


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