Re: Surge tester for 3-phase product.

[Lfresearch]

Indeed, Schaffner has just installed a 45 kVA 3-phase system in the USA.

Derek Walton

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Re: Surge tester for 3-phase product.

[Tony J. O'Hara]

Hi KC
Schaffner EMC makes these testers. (Surge tester for 3-phase product.)
If you access their web at www.schaffner.com you will find product info and
lists of different country contacts!
Regards
Tony
Colorado

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Re: Loop start fail over relays

[JPR3]

In a message dated 5/29/01, Dan Roman writes:

> I am looking for a relay that can be used without restriction for a fail 
> over function between CO trunks and station sets in a PBX type application. 
>  The fail over relays switch select CO trunks over to individual phones 
> should the PBX fail or lose power.  The coil to contact insulation must 
> protect SELV from TNV-3 and the contact to contact insulation must protect 
> TNV-2 (which is not isolated from SELV) from TNV-3.  


Hi Dan:

Sounds like what you want is a relay that provides "supplementary insulation 
for a working voltage of 250 volts" between open contacts.  I've started down 
that path before, but have usually found another solution before I had to 
actually source such a relay.

Back in 1993 I looked at the Omron G5H2 relay, which provided supplementary 
insulation between open contacts.  The internal design of this relay was an 
engineering marvel.  The relay footprint was 12 mm by 27 mm, so it was larger 
than most telecom relays, and it was more expensive.  I have heard that this 
relay may have been discontinued, but it was certainly a nice part if you had 
to have supplementary insulation between open contacts.

In practice, I have found that the requirement for supplementary insulation 
between open contacts can usually be waived by exercising certain clauses in 
EN 60950.  In particular, the exemptions involving a permanent connection to 
earth ground are very useful for some types of equipment, including PBXs.  
You might look into this approach some more before you go crazy trying to 
source a special relay.


Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848
http://www.randolph-telecom.com

Re: Power Cords Under Raised Floors ...

[Doug McKean]

Thanks to those who answered off-line. 

Appreciated the inputs. 

- Doug McKean 



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Loop start fail over relays

[Roman, Dan]

Group(s),
 
[With Mission Impossible theme song music playing in the background.]
 
I am looking for a relay that can be used without restriction for a fail
over function between CO trunks and station sets in a PBX type application.
The fail over relays switch select CO trunks over to individual phones
should the PBX fail or lose power.  The coil to contact insulation must
protect SELV from TNV-3 and the contact to contact insulation must protect
TNV-2 (which is not isolated from SELV) from TNV-3.  The internal equipment
connection schemes are cast in stone so I can't change the design to make
relay selection easier.
 
Finding relays to perform this function for the less stringent areas of the
world that only require basic insulation at 120V (or merely a 1000Vac
dielectric test) is relatively easy.  Finding relays that are small surface
mount types whose contact to contact specs meet the requirements for
supplementary insulation at 250V for Nordic countries is not.  Best I've
been able to do so far is some nice small relays (bigger than the CAD guys
would like though) that have contact to contact dielectric rated 1800Vac but
the creepage and clearance distances on the mounting pins themselves are far
below the 2.5/2.0 mm required.
 
Does anyone know of a relay that fits the bill that I have not stumbled upon
yet?
 
Thanks in advance.

-- 
Dan Roman, Compliance Engineer 
Dialogic®, an Intel Company 1515 Rt. Ten, Parsippany, NJ 07054 
* mailto:dan.ro...@dialogic.com   Mail Stop:
2PY2-021 
*Voice: +1 (973) 967-6485  Fax: +1 (973) 967-8109 

 

RE: HERP / HERF

[Price, Ed]

Hjalmar:

Google

http://www.google.com

got 13,100 hits searching on HERF -cigar -hereford (High Energy RF; fuel is
mentioned at only a couple of sites, this may take a bit of reading!).

Try:

http://liun.hektik.org/hightech/herf/58.htm
http://www.dnd.ca/admfincs/subjects/cfao/034-51_e.asp


HERP is a lot more selective! Try:

http://www.nawcad.navy.mil/atlantic_ranges/e3/herp.cfm

SPAWAR has something at:

http://www-chas.spawar.navy.mil/code/323/mainpage.html

Also, look at Paragraphs 5.8.1 & 5.8.2 of Mil-Std-464.

There's a bunch of references at:

http://www.acq-ref.navy.mil/turbo2/topics/x.cfm

Regards,

Ed



Ed Price
ed.pr...@cubic.com
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA  USA
858-505-2780  (Voice)
858-505-1583  (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis


>-Original Message-
>From: Hjálmar Árnason [mailto:hjal...@tetra.is]
>Sent: Tuesday, May 29, 2001 4:35 AM
>To: emc-p...@majordomo.ieee.org
>Subject: HERP / HERF
>
>
>
>
>Hi all
>
>can someone inform me where I am able to find 
>information about
>
>HERP ( Hazard of EMR to Personnel ) and
>HERF ( Hazard of EMR to Fuel ).
>
>either standards / regulations or some written
>material which sheds light on these.
>
>Hjalmar
>
>
>STIKLA ehf
>Hjalmar Arnason
>Manager Technical Operations
>Hlidasmara 11
>201 Kopavogi
>ph.   5455703
>fax   5455709
>gsm.  8626265
>nmt.  8526265
>hjal...@tetra.is
>

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RE: Good arguments

[WOODS]

Article 2 (a) says covered apparatus means any equipment that is either
radio equipment or telecommunications terminal equipment or both.

Article 2 (c) says radio equipment means a product, or relevant component
thereof, capable of communications by means of emissions and/or reception of
radio waves utilizing the spectrum allocated to terrestrial/space
radiocommunications. 

Article 2 (d) says radio waves means electromagnetic waves of frequencies
from 9 kHz to 300 GHz, propagated in space without artificial guide.

Richard Woods

--
From:  am...@westin.org [SMTP:am...@westin.org]
Sent:  Tuesday, May 29, 2001 9:10 AM
To:  emc-p...@majordomo.ieee.org
Subject:  Good arguments 


Hi all,

Can you help me with some good arguments why a RF transmitter in
broadband 
television cable system is not covered by RTTE ? Is it as simple as
because it 
use cables and is not wireless ?

Best regards
Amund Westin, Oslo/Norway

-- 
Get your firstname@lastname email for FREE at
http://Nameplanet.com/?su

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Re: HERP / HERF

[Andrew Carson]

Hjalmar

For a starting point re HERP you could try the EU Council recommendation
1999/519/EC. Covers recommended limits for exposure of the general
public to EM fields.

ERA TEchnologies, in Leather head, UK. Offer a technical report (ERA
Report 99-0001) again on human exposure, limits and measuring
techniques.

also try the following web links,

http://www.nrpb.org.uk/

http://www.icnirp.de/

http://www.mcw.edu/gcrc/cop.html



Hjálmar Árnason wrote:

> Hi all
>
> can someone inform me where I am able to find
> information about
>
> HERP ( Hazard of EMR to Personnel ) and
> HERF ( Hazard of EMR to Fuel ).
>
> either standards / regulations or some written
> material which sheds light on these.
>
> Hjalmar
>
> STIKLA ehf
> Hjalmar Arnason
> Manager Technical Operations
> Hlidasmara 11
> 201 Kopavogi
> ph.   5455703
> fax   5455709
> gsm.  8626265
> nmt.  8526265
> hjal...@tetra.is
>
> ---
> This message is from the IEEE EMC Society Product Safety
> Technical Committee emc-pstc discussion list.
>
> Visit our web site at:  http://www.ewh.ieee.org/soc/emcs/pstc/
>
> To cancel your subscription, send mail to:
>  majord...@ieee.org
> with the single line:
>  unsubscribe emc-pstc
>
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>
> All emc-pstc postings are archived and searchable on the web at:
> http://www.rcic.com/  click on "Virtual Conference Hall,"

--

Andrew Carson - Product Safety Engineer
Xyratex Engineering Laboratory
Tele 023 92496855 Fax 023 92496014

RE: HERP / HERF

[Graham Kilshaw]

Hjalmar

There are some articles covering these topics on rbitem.com, and some info
contained within Mil Std 464. Enter HERP and HERF as keywords into the
SEARCH field and then view the results displayed under EMC Standrads and
Archives.

Here is a link

http://www.rbitem.com

Regards
Graham Kilshaw
rbitem.com

-Original Message-
From: Hjálmar Árnason [mailto:hjal...@tetra.is]
Sent: Tuesday, May 29, 2001 7:35 AM
To: emc-p...@majordomo.ieee.org
Subject: HERP / HERF




Hi all

can someone inform me where I am able to find 
information about

HERP ( Hazard of EMR to Personnel ) and
HERF ( Hazard of EMR to Fuel ).

either standards / regulations or some written
material which sheds light on these.

Hjalmar


STIKLA ehf
Hjalmar Arnason
Manager Technical Operations
Hlidasmara 11
201 Kopavogi
ph.   5455703
fax   5455709
gsm.  8626265
nmt.  8526265
hjal...@tetra.is

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Good arguments

[amund]

Hi all,

Can you help me with some good arguments why a RF transmitter in broadband 
television cable system is not covered by RTTE ? Is it as simple as because it 
use cables and is not wireless ?

Best regards
Amund Westin, Oslo/Norway

-- 
Get your firstname@lastname email for FREE at http://Nameplanet.com/?su

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Re: Surge tester for 3-phase product.

[Andrew Carson]

KC

You could try Haefley Trench, the do a single phase PSURGE 4010 unit, which 
links into a  FP-SURGE 32.1 three phase de
coupling network.

The are a Swiss company on +41 61 31 55111 or
UK local office is +44 1462 486042

Not sure about far east contact number though.

"KC CHAN [PDD]" wrote:

> Dear All
>
> I am looking for Surge tester for 3-phase in-situ test, could someone know 
> any suppliers making this kind of product?
>
> Thank You.
> KC Chan
>
> ---
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--

Andrew Carson - Product Safety Engineer
Xyratex Engineering Laboratory
Tele 023 92496855 Fax 023 92496014



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HERP / HERF

[Hjálmar Árnason]

Hi all

can someone inform me where I am able to find 
information about

HERP ( Hazard of EMR to Personnel ) and
HERF ( Hazard of EMR to Fuel ).

either standards / regulations or some written
material which sheds light on these.

Hjalmar


STIKLA ehf
Hjalmar Arnason
Manager Technical Operations
Hlidasmara 11
201 Kopavogi
ph.   5455703
fax   5455709
gsm.  8626265
nmt.  8526265
hjal...@tetra.is

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Re: EN55022:1998 Annex C

[Chris Allen]

Hi Bill,

In addition to ITE that connects to the telecomms network, it also applies to
equipment that employs LANs. Under the definitions, section 3.6 defines
Telecommunication Ports as:

"Ports which are intended to be connected to telecommunications networks (e.g.
public swithed telecommunication networ, integrated services digital networks),
local area networks (e.g. Ethernet, Token Ring) and similar networks."

Regards,
Chris.






"Bill Wilson"  on 28/05/2001 20:32:35

Please respond to "Bill Wilson" 

Sent by:  "Bill Wilson" 


To:   "Treggers" 
cc:(Chris Allen/GB/3Com)
Subject:  EN55022:1998 Annex C




Treggers,
I need your help re EN55022:1998 and what I've been told is Annex C which is an
additional conductive test effective 8/1/01. Does this apply to all ITE or just
that which connects directly to the telecom network? I've been receiving mixed
responses from the local EMC labs.
Bill Wilson
W.W.Wilson Associates
508-651-1388
wwwil...@ma.ultranet.com
www.wwwilsonassoc.com



Treggers,
I need your help re EN55022:1998 and what I've been 
told is Annex C which is an additional conductive test effective 8/1/01. Does 
this apply to all ITE or just that which connects directly to the telecom 
network? I've been receiving mixed responses from the local EMC 
labs.
Bill WilsonW.W.Wilson 
Associates508-651-1388wwwil...@ma.ultranet.comwww.wwwilsonassoc.com

Surge tester for 3-phase product.

[KC CHAN [PDD]]

Dear All

I am looking for Surge tester for 3-phase in-situ test, could someone know any 
suppliers making this kind of product?

Thank You.
KC Chan


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Flammability of fiber optic cable

[Tania Grant]

  
I need to determine UL and Bellcore/Telcordia flammability requirements of 
fiber optic cable.  My preliminary information is that UL is only concerned 
with the flammability of "buffered" fiber optic cable, and of splices, but not 
with the fiber optic cable itself.

Can anyone confirm this?   And what about Bellcore/Telcordia?   Do they agree 
with the UL position?   

Thank you for your responses.

Tania Grant
taniagr...@msn.com