Re: [PSES] [EXTERNAL] Re: [PSES] Sometimes the simple aspects aren't

[Mark Hone]

James –

Thank you!  I see they do a Stainless Steel M3 x 6mm long plain stud so I will 
pass that onto our DO and see what they think: electrically it’s ideal for a 
crocodile clip and pointed probe for a four terminal resistance test.

With best regards,

Mark

From: James Pawson (U3C) 
Sent: 03 September 2018 10:21
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [EXTERNAL] Re: [PSES] Sometimes the simple aspects aren't

Hi Mark,

What about stud welding?
https://www.taylor-studwelding.com/about-stud-welding#problems

HTH
James

From: Mark Hone mailto:mark.h...@tpgroup.uk.com>>
Sent: 03 September 2018 10:17
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: [PSES] Sometimes the simple aspects aren't

Dear List Members,

I have been asked for a simple solution to a simple challenge.  But I can’t 
think of anything better than what we do at present.

Background: the equipment will be installed in a slightly damp environment and 
will be expected to have a life of much more than twenty years, so keeping rust 
at bay is a challenge.

The problem: earth bond test points are needed on a metal frame, made up of 
multiple robustly painted steel sections, a test point on each section.

In the past, 6 mm diameter patches were zinc plated and masked when the 
sections were painted – but probing on them over the years scratched the 
plating letting corrosion grab hold (and even when new they didn’t look nice).

More recently, blind rivet nuts are being used in the hollow section frame, 
these looked quite good as well as providing robust test points (heads masked 
during painting).  They seem to be reliable test points that don’t cause a rust 
problem.

But on a new design, C-section frame is to be used in places, which means the 
back of the blind rivet nuts will be exposed to view, which is considered 
unsightly.

My request for help:  does anyone know of a simple-something that can be used 
on/in/through C-section steel prior to painting, that can subsequently be used 
as an earth bond (at 10 A DC) test point, that will last for decades, and look 
good?

Ever hopeful,

Mark

Mark Hone
Electrical Manager
TPG Maritime Ltd
[cid:image002.png@01D44373.33558650]Email:   
mark.h...@tpgroup.uk.com<mailto:mark.h...@tpgroup.uk.com>
Tel:  023 9262 9239
Mob:07919 047775
Web:www.tpgroup.uk.com<http://www.tpgroup.uk.com/>
Dolphin House, Williams Road, Portsmouth, Hampshire, PO3 5FP, UK



Disclaimer

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[PSES] Sometimes the simple aspects aren't

[Mark Hone]

Dear List Members,

I have been asked for a simple solution to a simple challenge.  But I can't 
think of anything better than what we do at present.

Background: the equipment will be installed in a slightly damp environment and 
will be expected to have a life of much more than twenty years, so keeping rust 
at bay is a challenge.

The problem: earth bond test points are needed on a metal frame, made up of 
multiple robustly painted steel sections, a test point on each section.

In the past, 6 mm diameter patches were zinc plated and masked when the 
sections were painted - but probing on them over the years scratched the 
plating letting corrosion grab hold (and even when new they didn't look nice).

More recently, blind rivet nuts are being used in the hollow section frame, 
these looked quite good as well as providing robust test points (heads masked 
during painting).  They seem to be reliable test points that don't cause a rust 
problem.

But on a new design, C-section frame is to be used in places, which means the 
back of the blind rivet nuts will be exposed to view, which is considered 
unsightly.

My request for help:  does anyone know of a simple-something that can be used 
on/in/through C-section steel prior to painting, that can subsequently be used 
as an earth bond (at 10 A DC) test point, that will last for decades, and look 
good?

Ever hopeful,

Mark

Mark Hone
Electrical Manager
TPG Maritime Ltd
[cid:image003.png@01D4436F.32931D80]Email:   mark.h...@tpgroup.uk.com
Tel:  023 9262 9239
Mob:07919 047775
Web:www.tpgroup.uk.com<http://www.tpgroup.uk.com/>
Dolphin House, Williams Road, Portsmouth, Hampshire, PO3 5FP, UK

Disclaimer
TP Group plc, A2/1064 Cody Technology Park, Farnborough, Hampshire, GU14 0LX, 
United Kingdom. Registered No. 3152034

This email and any attached files are private and confidential and for the use 
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the sender immediately and delete the material from any computer. Copying or 
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Re: [PSES] Doug Smith's second teaser

[Mark Hone]

I’d like to second John’s query, as I haven’t seen the explanation either.

If it has been posted, are EMC-PSTC postings being lost somewhere?  I have 
checked our company spam filters!

Regards,

Mark

From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: 08 February 2018 14:15
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Doug Smith's second teaser


I didn't see an explanation from Doug about the open-ended shield of a balanced 
twisted pair being OK. Did I miss it or is the solution still awaited?

--

John Woodgate OOO-Own Opinions Only

J M Woodgate and Associates www.woodjohn.uk

Rayleigh, Essex UK

Disclaimer
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[PSES] Machinery Directive: seagoing vessels

[MARK HONE]

Colleagues – Can you help me? In the MachineryDirective, it says: 2.The 
following are excluded from the scope of this Directive: (f)seagoing vessels 
and mobile offshore units and machinery installed on boardsuch vessels and/or 
units; So what takes theplace of the Directive for equipment that may be fitted 
on a ship? The Marine EquipmentDirective seems to cover very specific products 
from what I can see on theMarEd website and my frustratingly limited ability 
with Google hasn’t turned upanything else. Can anyone help me identifya 
standard or directive that would cover a control system, a pump, some 
solenoidvalves and some sensors etc., joined together to form a process plant, 
that mightpossibly be used on a “seagoing vessel”? Ever hopeful, Mark

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Re: [PSES] Machinery Directive silly question?

[Mark Hone]

Gentlemen -

Thank you all for your help, as always it has produced balanced answers to my 
query, coming at it from all sides.  I can argue* confidently with colleagues 
here now.

With best grateful regards,

Mark

* that word should have been "discuss" but you know how it is...

--
Mark Hone
HESS Manager

Wellman Defence Limited
Dolphin House
Williams Road
Portsmouth
Hampshire
PO3 5FP

T: +44 (0)23 9262 9239
F: +44 (0)23 9269 7864
E: mh...@wellmandefence.co.uk
W: www.wellmandefence.co.uk


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[PSES] Machinery Directive silly question?

[Mark Hone]

Dear Colleagues,

I know that you are all patient with what might seem silly questions, so I hope 
you'll be patient with mine.

I have not had to consider the Machinery Directive before, but a new electrical 
product has a moving part in it.  It's a wholly enclosed (inaccessible in the 
middle of the equipment) fan that blows air through the equipment (not a 
cooling fan).

The MD defines machinery: " an assembly, fitted with or intended to be fitted 
with a drive system... consisting of... components, at least one of which 
moves, and which are joined together for a specific application".

So the silly question is, if the moving part is wholly contained within the 
equipment and is inaccessible, does the MD apply or do I apply the LVD?

I have Googled this question and have found references that say the MD does 
apply (it's the enclosure that makes the moving part safe), and references that 
say the MD does not apply (as the moving part is wholly internal, one doesn't 
need to even consider it).  I strongly suspect the former statement is the 
correct one.

Your authoritative opinions are sought!

With thanks in anticipation,

Mark


--
Mark Hone
HESS Manager

Wellman Defence Limited
Dolphin House
Williams Road
Portsmouth
Hampshire
PO3 5FP

T: +44 (0)23 9262 9239
F: +44 (0)23 9269 7864
E: mh...@wellmandefence.co.uk
W: www.wellmandefence.co.uk


Wellman Defence is a limited company registered in England and Wales.

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Registered Offices: Wellman International Ltd., Newfield Road, Oldbury, West 
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Re: [PSES] Flash injury - a little OT but not too much I hope

[Mark Hone]

Brian -

A heck of a resource on this website.

I think I may be happily occupied for quite a while...

Thank you!

Mark

-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Brian Oconnell
Sent: 12 March 2012 16:11
To: 'EMC-PSTC'
Subject: RE: Flash injury - a little OT but not too much I hope

Many threads and images of flash damage here: http://forums.mikeholt.com/

--
Mark Hone
HESS Manager

Wellman Defence Limited
Dolphin House
Williams Road
Portsmouth
Hampshire
PO3 5FP

T: +44 (0)23 9262 9239
F: +44 (0)23 9269 7864
E: mh...@wellmandefence.co.uk
W: www.wellmandefence.co.uk


Wellman Defence is a limited company registered in England and Wales.

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Midlands, B69 3ET, England.

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[PSES] Flash injury - a little OT but not too much I hope

[Mark Hone]

Dear Colleagues,

I give Electrical Health and Safety lectures here at work and one of the best 
props is a set photos of injuries to concentrate people’s minds at the start.

I have one black and white one of someone’s hand showing flash injury 
blackening, which came from a washing machine I think when the power switch was 
used, the flash coming around the rocker and blackening the hand which later 
blistered.  A good example of how easily an apparently simple fault can lead to 
a lot of grief.

I think the photo came from a post to this group several years ago, but 
although I have searched the archives, I can’t find the message.  Does this 
ring a bell with anyone?

What I would like to do is find the original photo and print it (now we have a 
colour printer!), sadly I didn’t save the photo electronically.

Your help would be most appreciated, if only to reassure me that my memory 
isn’t going.

Best regards,

Mark
--
Mark Hone
HESS Manager

Wellman Defence Limited
Dolphin House
Williams Road
Portsmouth
Hampshire
PO3 5FP

T: +44 (0)23 9262 9239
F: +44 (0)23 9269 7864
E: mh...@wellmandefence.co.uk
W: www.wellmandefence.co.uk


Wellman Defence is a limited company registered in England and Wales.

Company Registration No. 953609

Registered Offices: Wellman International Ltd., Newfield Road, Oldbury, West 
Midlands, B69 3ET, England.

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RE: Low Smoke Zero Halogen Cables

[Mark Hone]

Gentlemen -

Military environments that are "closed" have required the use of "Limited Fire 
Hazard" wire/cables/accessories since 1981/1982, and their importance rose 
after real-life problems in the Falklands war.  There are UK Defence Standards 
that cover the requirements in detail (try 
http://www.dstan.mod.uk/data/standev/61e.php  as a starting point if you want 
to look).

Mark

>>> Ted Eckert  05/11/08 18:32:35 >>>
Hello Mr. Merrill,

Generally, halogen free electronics requirements are driven by industry and 
NGOs (Non-governmental organizations.)  You will be hard pressed to find 
governmental regulations requiring halogen free electronics.  Even the 
definition of halogen free is not firmly set.

Randall Flinders gave a presentation on halogen free electronics at the 2008 
IEEE Product Safety Engineering Society symposium.  If you or somebody within 
Schneider Electric have access to the symposium CB, pull up Mr. Flinders' 
presentation for more information.  The presentation gives a good overview.

I can also recommend checking with the APC division of Schneider Electric.  A 
lot of the concern over halogens in electronics comes from the resulting 
combustion products.  There is some push towards halogen free wiring in data 
centers because of the concern of the hydrochloric acid that could result from 
combustion.  This in turn can corrode electronics in areas of the data center 
unaffected by the fire.  There are likely groups within APC that have done 
research on this subject.

Ted Eckert
Compliance Engineer
Microsoft Corporation
ted.eck...@microsoft.com 

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


From: john.merr...@us.schneider-electric.com 
[mailto:john.merr...@us.schneider-electric.com] 
Sent: Wednesday, November 05, 2008 10:10 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG 
Subject: Low Smoke Zero Halogen Cables

Hello

I am researching the actual requirements for Cables, power and communications.
Can anyone point me to Standards/Legislation as to when/where LSZH Cables are 
and are not
required?

Thanks in advance

John Merrill
Principal Product Safety Engineer
Schneider Electric

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Re: Reliability: MTBFs and Probability of Failure

[Mark Hone]

Colleagues -

I have been encouraged to record in a final email what I have discovered with 
your help in my search for reliability data, so that future searches of the 
EMC-PSTC archive will turn up the references.  The 
reliability/probability-of-failure figures are needed to allow calculations to 
confirm the SIL level of a safety critical system comprising both mechanical 
and electrical parts.  Here are the Standards, with a couple of website links 
too:

Mechanical Reliability

NSWC 98 Handbook of Reliability Prediction Procedures for Mechanical Equipment, 
latest issue and supporting MechRel software package are both available at no 
charge from the following web site:
http://www.dt.navy.mil/tot-shi-sys/pro/rd-pro/mec/index.html

NPRD-95 The Non-electronic Parts Reliability Data databook is published by the 
Reliability Analysis Center and provides historical field failure rate data on 
a wide variety of mechanical assemblies.  This document has to be purchased.

Electronic Reliability

Mil-Hdbk-338 Electronic Reliability Design Handbook 
Mil-Hdbk-217 Reliability Prediction Of Electronic Equipment
Mil-Hdbk-344A Environmental Stress Screening (ESS) of Electronic Equipment
Down-loadable with no charge  from:
http://www.assistdocs.com/search/search_basic.cfm

Telcordia SR-332

Handful of Websites

http://www.enre.umd.edu/tools/mpp.htm
http://www.isamex.org/C_Seguridad/articulosTec/maquinaria/accurate_FMEDA_mechanicalinstrument_techniques_TUV.pdf
http://www.gmigasandflame.com/sil_info_levels.html
http://www.iec.ch/zone/fsafety/concepts.htm
http://www.relex.com/resources/prmodels.asp
http://www.sae.org/
http://quanterion.com/ReliabilityQues/V1N1.htm

I haven't asked everyone individually if I can credit them with the help 
they've provided so I'll not list names in full, but I do think their 
contributions should be recognised, so here's a big thank you to:
Bill, Charlie, Chris, Dave, Macy, Neil, Paul, Robert and Ted

Regards,  Mark




--
Mark Hone, HESS Manager
  Wellman Defence Limited   
  Williams Road  
  Portsmouth, Hampshire  
  PO3 5FP, ENGLAND
  Tel: +44 (0)23 9266 4911
  Tel: +44 (0)23 9262 9239 (Direct)
  Fax: +44 (0)23 9269 7864
  Mobile: +44 (0)7919 047775

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Re: Reliability: MTBFs and Probability of Failure

[Mark Hone]

Colleagues -

May I thank everyone who has Emailed me both directly and though the mailing 
list, for the help they have provided.

In just five-and-a-half hours I have received enough links and pointers to keep 
occupied solidly for a week or two reading it all.

With thanks again,

Mark

  

--
Mark Hone, HESS Manager
  Wellman Defence Limited   
  Williams Road  
  Portsmouth, Hampshire  
  PO3 5FP, ENGLAND
  Tel: +44 (0)23 9266 4911
  Tel: +44 (0)23 9262 9239 (Direct)
  Fax: +44 (0)23 9269 7864
  Mobile: +44 (0)7919 047775

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Reliability: MTBFs and Probability of Failure

[Mark Hone]

Dear All,

I am most embarrassed to say that I can't find in my saved emails or in a 
search of the EMC-PSTC archives or in Google search, a reference I think I once 
saw to a Mil Handbook that helps with calculations of MTBFs for mechanical 
items.  I'm sure someone has mentioned it in the same breath as Mil Hdbk 217F.

Can someone help me with a reference, please?!

And any book recommendations on the subject (preferably titled "The Idiot's 
Guide to...")?

For your interest, we're doing some safety assessments (to IEC 61508) of a new 
piece of equipment with a view to achieving an appropriate SIL rating.

With hopeful regards,

Mark

--
Mark Hone, HESS Manager
  Wellman Defence Limited   
  Williams Road  
  Portsmouth, Hampshire  
  PO3 5FP, ENGLAND
  Tel: +44 (0)23 9266 4911
  Tel: +44 (0)23 9262 9239 (Direct)
  Fax: +44 (0)23 9269 7864
  Mobile: +44 (0)7919 047775

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RE: RF What-if (was: RE: Another Cancer Scare?)

[Mark Hone]

Gentlemen -

It seems to me this is such a hot potato and has bean such a topic of debate, 
that we should hold out a carrot to anyone who can sort out the wheat from the 
chaff in this correspondence, be they Swede or from Brussels, without making a 
meal of it.

Lettuce finish here regarding this field of discussion lest the details leek 
out and the press get hold of it.

Unless of course it's someone's oats.

Regards,

Mark

(Sorry)


>>> "Haynes, Tim (SELEX GALILEO, UK)"  18/08/08 
>>> 17:03:51 >>>

>John Woodgate wrote...

>Zoom in. No, much more than that!

Oh! Am I now supposed to say Goodness Me?

(If it is, it doesn't look too healthy!)

Is that why the fields around there are getting special treatment in
terms of satellite resolution?

Regards

Tim

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Re: Limits for Class D equipment in EN61000-3-2

[Mark Hone]

In article: <002a01bef9ed$9ab57060$4b6ed...@info.samsung.co.kr> 
le...@khgw.info.samsung.co.kr writes:
> This is a multi-part message in MIME format.
>
> SGkgZ3JvdXAuDQoNCk5vdGUgdGhhdCBmb3IgcHJvZHVjdHMgbm90IHdpdGhpbiB0a

How's that again for those of us who can't decode MIME?

Frustratedly,
Mark
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service Road  Tel: +44 (0)23 9262 9239 (Direct)
  Portsmouth, Hampshire Tel: +44 (0)23 9266 4911
  PO3 5PG, ENGLAND  Fax: +44 (0)23 9269 7864





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Equipment designed and manufactured for use in-house

[Mark Hone]

In article: <199908122132.haa09...@iswfwa.effem.co.uk> 
carlos.perk...@eu.effem.com writes:

> A question from UK:
>
> Does anyone have a strategy for handling the Low Voltage and EMC  
> Directive requirements relating to equipment made for use in-house?
>
> By this, I mean test boxes, power supplies, break-out boxes, etc.
> 
> These products are not meant to be offered for sale (ie not 'placed on 
> the market'), but have been 'taken into service' by being switched on 
> and used. I think, therefore, that the protection requirements of the 
> Directives must be met, but CE marking is not necessary.
> 
> In terms of Safety, I think EN 60950 and EN 61010-1 are relevant.
> 
> Does anyone have a view on this?
> 
> Cheers,
> 
> Carlos Perkins

>From the investigations I've done, and reading others' interpretations 
of the requirements, I think you have it in a nutshell.

But try telling management that "just a simple test box" still has to 
comply, and ought to be tested and documented.  I would guess that the 
critical word in the sentence is "ought".

Regards,  Mark

Opinions expressed do not necessarily represent those of my employer.
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service Road  Tel: +44 (0)23 9262 9239 (Direct)
  Portsmouth, Hampshire Tel: +44 (0)23 9266 4911
  PO3 5PG, ENGLAND  Fax: +44 (0)23 9269 7864





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Re: CE mark self certification

[Mark Hone]

>Nothing about the content is puzzling... the basic required content
>is pretty much defined. I am more curious as to the format,
>presentation, "added extras", handling of measurement uncertainty, etc.
>that is used by industry wide TCF creators.
>Bob Heller

>A competent body issues a technical construction file (for EMC
>directive).
>Frank West

With regard to meeting the EMC Directive, we went to a Competent
Body, who (as part of our contract with them) provided us with two
documents - a guide to writing a Technical Construction File and a
(real) example TCF.  The example TCF was the final version, but included
details of the changes the CB had required between the draft and final
version.  And as Bob mentioned in his Email, some of the changes were
to do with style rather than content.
We wrote our TCF bearing in mind both the technical content and the
style required, and had only a few changes requested before our TCF was
signed off.
The money we paid the CB was well spent: I am confident that our TCF and
other subsequent files would be well received if it every came to the
crunch and we were challenged regarding compliance.

With regards to all chaps and chappettes of the mailing list,
Mark

-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND





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Re: (not a) Chlorine Gas System

[Mark Hone]

> It was brought up to our attention, that chlorine gas
> system for swimming pool water treatment is no
> longer advisable, the trend now adays is to use 
> liquid system instead.  Any more input in this
> regard will be appreciated.

Dear Jaber,

As no one else has replied to your query, I'll jump in with some out of 
date information, and a pointer to where to look next.

About eighteen years ago, my employers (then called CJB Developments 
Ltd) sold such chlorination systems to municipal swimming pools.  Into 
the system one fed water, electricity and salt, and out came a solution 
of sodium hypochlorite that was stored in a large tank and dosed into 
the recirculated pool water, to maintain the appropriate concentration 
in the pool.  The process involved an electrolytic cell that was 
purchased from Diamond Shamrock in the States.  The advantages are no 
chlorine gas to worry about (there were several well publicised nasty 
accidents in pools at that time), and an automatic dosing system that 
doesn't involve the alternative of tossing expensive chlorination 
tablets into the pool until the concentration is correct (involving 
chemical analysis of a sample of pool water).  Reliability must be 
pretty good, as we've recently heard of one of our 17 year old plants 
that's still in use.  CJB stopped selling the systems about 15 years ago 
as they were not deemed "core business".

A search of the 'Net for the trade name "Sanilec" brought up Exceltec 
International Corporation who sell such systems, so pop along to 
http://www.sanilec.com where it looks like all your questions will be 
answered!

Regards, Mark

All opinions are my own (and come from an unreliable memory), and do not 
necessarily represent those of my employer.
emc-p...@ieee.org

-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND





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ESD procedures

[Mark Hone]

In article: <35d21c22.74e9a...@vina-tech.com> 
dwight.hunnic...@vina-tech.com writes:
> 
> Any of you ever get handed the responsibility to deploy an ESD control
> system for your engineering group?  I'm talking about ESD for our
> hardware and test engineers, not the manufacturing folks.  
> Just put out the ESD mats and distribute wrist straps, and have a 
> tester laying around to check straps?  I'm sure there is more to it 
> than that...any good books to read, or websites to plunder? Any US or 
> Euro standards to follow for the engineering group (per ISO9001) ?
 
A document well worth reading is BS EN 100015 which covers just about 
everything possible regarding how one should protect Electrostatic 
Sensitive Devices.  It has nine Sections, with Annexes and loads of 
Figures and Tables (see end of this message for details).

It’s a comprehensive Standard, and following it to the letter is arduous 
- we have used it to generate our own in-house company Standard so I 
speak from experience.  However, the principles it puts forward are only 
common sense in the end, and it's quite a practical, readable document. 
Our QA department (we're ISO9000) were very happy with our in-house 
engineer-written standard.  

I think the subjects of interest to you would be initial training of 
everyone who comes into contact with ESDSs (and regular follow-up 
training to remind them what they have forgotten) and the daily, weekly, 
monthly and six-monthly recorded checks on equipment and procedures.  
We’ve hired training videos from Vermasons (Weston-super-Mare, England 
Tel: +44 (0) 1934 518777) and we buy all our wrist straps, chairs, mats 
and things from them as the bits all meet the limits of the BS EN 
standard.  (I haven’t searched to see if they have a Web site I’m 
afraid.)


For your interest, the nine sections of BS EN 100015 are: General; 
Design consideration to minimise the effects of ESD; Labels signs and 
marking; ESD Protected Area (EPA); Protective packaging marking and 
identification for ESDS; Purchase, receipt, storage and handling; 
Training; Quality responsibilities; Periodic audit instructions
Annexes: Test procedures; Surface resistivity and resistance to ground; 
Charge decay; Measurement of antistatic properties; Additional tests; 
Measurement of relative humidity.
Figures: ESDS basic symbol ; ESDS simplified symbol ; Warning label for 
ESDS ; Warning sign for ESD protected area ; Examples of ESD earth 
facility labels ; Examples of earth bonding point labels ; Examples of 
earth grounding point labels ; Schematic of typical EPA ; Example of an 
EPA showing typical facilities ; Fieldwork implementation of EPA ; 
Fieldwork implementation of EPA with bench ; Charge measuring equipment 
; Capacitive sensor; Electrostatic shielding test equipment).
Tables: User guide chart resistance, resistivity and charge decay in ESD 
protected areas; User guide chart for packaging materials; Suggested 
format for report.

Hope that’s of help!

Regards, Mark
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND





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Re: CE technical file format

[Mark Hone]

Dear Gary,

Other replies that I have seen to your original query have related to 
the Technical Construction File, in turn related to the EMC Directive.  
But you mentioned only a Technical File, so here’s my ha’p’th:

The UK Department of Trade and Industry (DTI) in their idiot’s guides to 
the Low Voltage Directive and Machinery Directive give advice on what a 
Technical File should contain, to support compliance with those 
directives.  These guides are thoroughly recommended - get a copy if you 
can.

I used the DTI’s advice to come up with a set of section headings for 
our Technical Files, with a bit of explanation of what ought to go in 
each section, so that I and my colleagues could be reasonably consistent 
in our filing.

If you’d like a copy of the headings and explanations (which comes with 
no guarantees of "correctness"!), email me and I’ll send you a copy.

Regards, 
Mark

All views and opinions are my own, and do not (necessarily) represent 
those of my employer.
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND

Low Voltage directive and IEC1010

[Mark Hone]

Dear Gary,

Chris Dupres in his reply to your query about '61010 mentioned a check 
list in process of being written by BSI, but not yet available.

I created a check list of my own a couple of years ago to record 
assessment of designs against the criteria of BSEN61010, it has every 
paragraph of BSEN61010 referenced in a table (I hope), with a column for 
test results, and one for comments (like "not applicable" if you 
haven't any transformers as Chris mentioned).

If you want a copy (which comes with no guarantee of "correctness" - 
check it out for yourself!), email me and I’ll send you a copy.  It’s a 
Word 6 file which I would try to attach to the email (I’m an email 
novice), or I could convert the file to straight text and attach it, or 
embed it in the email (though what it would look like...).

Regards, 
Mark

All views and opinions are my own, and do not (necessarily) represent 
those of my employer.
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND

Re: EN 60950 and component heating

[Mark Hone]

To add to Art Michael's ways used to "work around" the problem of PCBs 
getting too hot, if the heat is being radiated (rather than conducted 
through the leads) from the component to the PCB, put a shiny reflective 
surface on the PCB (self adhesive aluminium foil, or just an area of 
copper on the top of the board under the component).  Every little 
helps.

Regards,

Mark (whose PCBs went black and crunchy when they got a little too 
hot...)

-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND

Re: Required power shut off in unoccupied buildings

[Mark Hone]

In article: <9702048574.aa857494...@iris.scitex.com> 
richard_c...@iris.scitex.com writes:
> 
>  Greetings,
>  
>  Brief Background:  The printing equipment we build runs best when 
>  the main power is left on 24 hours a day.  This is because when  
>  not in use our printers run purging cycles every two hours and a 
>  lengthy cleaning cycle once over night every night.
>  
>  Question:  At our company there have been various rumors and 
>  myths circulating over the years that, especially in certain  
>  European countries,  certain utilities, municipalities, or 
>  countries require by law that all power be shut off when a 
>  commercial building is unoccupied.  This would be most likely to 
>  happen over weekends or over holidays.  Can anyone in this group
>  confirm or deny this and, if true, how pervasive it is.
>  
>  Thank you in advance for any help you can provide.
>  
>  Richard Cass
>  IRIS Graphics, Inc.
>  Bedford, MA
>  USA
> 
I've not heard of this as a law in Britain, but I believe some insurance 
companies insist that all unnecessary equipment is turned off over 
night.  A sister company to us some years ago had a fire, and I was told 
that the insurers subsequently insisted that the night security man 
switch every thing off at the wall plug during his rounds: anything that 
had to be left on had to have a specific notice affixed to the plug. 

The rule was not imposed at our location: what with time clocks, file 
servers, UPSs and things, there would have been special "don't turn off" 
notices everywhere.  Overall, I'd say it would be impractical to have 
legislation of this type, as there would be too many exceptions to the 
rule, like your self cleaning printers.  Not that that would put the EC 
bureaucrats off... have you heard about the straight banana directive?
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND
-- 
Mark Hone

  Wellman CJB Limited   Email: m...@cjbdev.demon.co.uk
  Airport Service RoadTel: +44 (0)1705 664911
  Portsmouth, Hampshire   Fax: +44 (0)1705 697864
  PO3 5PG, ENGLAND