RE: Ground lugs

[Lacey,Scott]

James,

In our lab, I just spotted a tin-plated lug of the type you seek. It is
marked "BURNDY SCRULUG", and is tin plate over copper, with a clamping plate
between the screw and the wire. I have no idea how old this lug is, or if
Burndy still makes them, but it might be a good idea to contact them.

Scott Lacey

> -Original Message-
> From: goedd...@sensormatic.com [SMTP:goedd...@sensormatic.com]
> Sent: Friday, December 17, 1999 2:09 PM
> To:   emc-p...@majordomo.ieee.org
> Subject:  Ground lugs
> 
> 
> Happy Holidays group,
> 
> In getting agency approval on our I.T.E. product, the safety ground
> terminal
> has come into question. 
> When hard wiring a product, Para. 3.3.7 indicates that the conductor is to
> be clamped between metal surfaces, and the terminal shall not damage the
> conductor. This has been interpreted as the terminal must have a metal
> plate
> that clamps down on the conductor, and no rotational stresses from the
> screw
> are applied to the conductor. 
> 
> In Europe, I understand that a rail terminal block, where one of the
> terminals is shorted to a rail, is generally used, and accepted, but
> somewhat costly. There may also be alternatives, but we haven't found an
> off
> the shelf one yet.
> 
> I am looking for a grounding terminal that accepts #14-#18 AWG wire, has a
> clamping plate, is tin plated, and has a mount or hole for direct
> connection
> to a chassis. 
> 
> Since this has been so difficult a component to find, we had one designed.
> Now my question is, "How is everyone else dealing with this ground lug
> requirement? Is there a common component available that meets these specs?
> The ground lugs in common use in the electrical industry do not have the
> plate, and are copper or copper alloy.
> 
> Thank you for your assistance.
> 
> James Goedderz
> Sensormatic 
> 
> -
> This message is coming from the emc-pstc discussion list.
> To cancel your subscription, send mail to majord...@ieee.org
> with the single line: "unsubscribe emc-pstc" (without the
> quotes).  For help, send mail to ed.pr...@cubic.com,
> jim_bac...@monarch.com, ri...@sdd.hp.com, or
> roger.volgst...@compaq.com (the list administrators).
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Re: Korean Immunity - What IS it??

[Benoit Nadeau]

Bonjour de Montreal,

The Korean rules is requiring the following immunity tests:

ESD : similar to 61000-4-2 
RF immunity : similar to 61000-4-3
EFT : similar to 61000-4-4
Surges : similar to 61000-4-5 (including the 10/700 uS for telecom)
Voltage drops : similar to 61000-4-11 but with different delays than the
European generic or specific standards.

Hope this help.




At 10:42 AM 12/20/1999 -0700, Grasso, Charles (Chaz) wrote:
>
>Hello,
>
>Does anyone in this august body know what immunity
>requirements need to be met?
>
>Is the testing done in country?
>
>-
>This message is coming from the emc-pstc discussion list.
>To cancel your subscription, send mail to majord...@ieee.org
>with the single line: "unsubscribe emc-pstc" (without the
>quotes).  For help, send mail to ed.pr...@cubic.com,
>jim_bac...@monarch.com, ri...@sdd.hp.com, or
>roger.volgst...@compaq.com (the list administrators).
>
>
>
>


--
Benoit Nadeau, ing. M.ing. (P.Eng., M.Eng)
Gerant du Groupe Conformite (Conformity Group Manager)
Matrox 
--

1055, boul. St-Regis
Dorval (Quebec) Canada
H9P 2T4

Tel : (514) 822-6000 (x2475)
FAX : (514) 822-6275
Internet : bnad...@matrox.com, 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: Ground lugs

[WOODS]

I have interpreted the second paragraph of Clause 3.3.2 of EN 60950, the
paragraph that mentions crimp connections, as applying only to special
non-detachable power supply cords. I also understood that the European
agencies don't allow crimp connections for mains connections since the
installer is not guaranteed of having the proper crimping equipment.

If my understanding is incorrect, someone please advise.

Richard Woods

--
From:  Lacey,Scott [SMTP:sla...@foxboro.com]
Sent:  Monday, December 20, 1999 8:19 AM
To:  'goedd...@sensormatic.com'
Cc:  'emc-p...@ieee.org'
Subject:  RE: Ground lugs


James,
Most equipment today uses crimp-on ring terminals, secured to a
ground stud
using a star washer and hex nut. The ground wire from the power
inlet goes
on first, and other safety grounds are stacked on top, each with its
own
star washer and nut. I have never had agency approval problems with
this
type of construction. You must use a "double crimp" ring terminal,
one that
grips the wire insulation securely.

If, for some reason, you must use the setscrew type lug, your best
bet would
be to have a batch of the commercial lugs tin plated. They are easy
to
dismantle once the setscrew is removed, and most large cities have
plating
houses. Tin is one of the easier (and cheaper) plating processes. I
completely agree that you must have a plate between the screw and
the wire.
I have seen wires almost cut in two by the other type.

Scott Lacey

> -Original Message-
> From: goedd...@sensormatic.com [SMTP:goedd...@sensormatic.com]
> Sent: Friday, December 17, 1999 2:09 PM
> To:   emc-p...@majordomo.ieee.org
> Subject:  Ground lugs
> 
> 
> Happy Holidays group,
> 
> In getting agency approval on our I.T.E. product, the safety
ground
> terminal
> has come into question. 
> When hard wiring a product, Para. 3.3.7 indicates that the
conductor is to
> be clamped between metal surfaces, and the terminal shall not
damage the
> conductor. This has been interpreted as the terminal must have a
metal
> plate
> that clamps down on the conductor, and no rotational stresses from
the
> screw
> are applied to the conductor. 
> 
> In Europe, I understand that a rail terminal block, where one of
the
> terminals is shorted to a rail, is generally used, and accepted,
but
> somewhat costly. There may also be alternatives, but we haven't
found an
> off
> the shelf one yet.
> 
> I am looking for a grounding terminal that accepts #14-#18 AWG
wire, has a
> clamping plate, is tin plated, and has a mount or hole for direct
> connection
> to a chassis. 
> 
> Since this has been so difficult a component to find, we had one
designed.
> Now my question is, "How is everyone else dealing with this ground
lug
> requirement? Is there a common component available that meets
these specs?
> The ground lugs in common use in the electrical industry do not
have the
> plate, and are copper or copper alloy.
> 
> Thank you for your assistance.
> 
> James Goedderz
> Sensormatic 
> 
> -
> This message is coming from the emc-pstc discussion list.
> To cancel your subscription, send mail to majord...@ieee.org
> with the single line: "unsubscribe emc-pstc" (without the
> quotes).  For help, send mail to ed.pr...@cubic.com,
> jim_bac...@monarch.com, ri...@sdd.hp.com, or
> roger.volgst...@compaq.com (the list administrators).
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: Ground lugs

[georgea]

Peter,

There is at least one explanation for the situation you describe.  The
chassis or cabinetry does not require earth grounding unless it can
become hazardous under a single fault in basic insulation.  If the
accessible metal is separated from hazardous voltages by double or
reinforced insulation, it is not required to be earthed per 2.5.11.

George




pmerguerian%itl.co...@interlock.lexmark.com on 12/20/99 11:25:11 AM

Please respond to pmerguerian%itl.co...@interlock.lexmark.com

To:   slacey%foxboro@interlock.lexmark.com,
  goedderz%sensormatic@interlock.lexmark.com
cc:   emc-pstc%ieee@interlock.lexmark.com (bcc: George Alspaugh/Lex/Lexmark)
Subject:  RE: Ground lugs




Dear All,

Some of you might be surprised to hear that I have seen Class I (earthed)
units out there (large manufacturers of ITE) with UL/TUV marks but with no
connection from the terminal of the appliance inlet to the chassis. That
is, there was no stud or screw on the chassis but reliance was made on the
metal-to metal connection of the inlet body to the chassis. How is this
possible?



At 08:18 20/12/1999 -0500, Lacey,Scott wrote:
>
>James,
>Most equipment today uses crimp-on ring terminals, secured to a ground stud
>using a star washer and hex nut. The ground wire from the power inlet goes
>on first, and other safety grounds are stacked on top, each with its own
>star washer and nut. I have never had agency approval problems with this
>type of construction. You must use a "double crimp" ring terminal, one that
>grips the wire insulation securely.
>
>If, for some reason, you must use the setscrew type lug, your best bet would
>be to have a batch of the commercial lugs tin plated. They are easy to
>dismantle once the setscrew is removed, and most large cities have plating
>houses. Tin is one of the easier (and cheaper) plating processes. I
>completely agree that you must have a plate between the screw and the wire.
>I have seen wires almost cut in two by the other type.
>
>Scott Lacey




-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: TC85/WG11

[WOODS]

That was published as IEC 61786 in 08-1998.
Richard Woods

--
From:  rehel...@mmm.com [SMTP:rehel...@mmm.com]
Sent:  Monday, December 20, 1999 8:36 AM
To:  emc-p...@majordomo.ieee.org
Subject:  TC85/WG11




I have the cover page (only) of a Draft 8, October 1997 concerning
"Measurement of low frequency magnetic and electric fields with
regard to
exposure of human beings - Special requirements for instruments and
guidance for measurements". Does anyone know if the committee still
exists
(I believe that it is/was an IEC committee)? Or if their work was
finalized? Is there a contact at the IEC where I can find out the
members
of committees?

Thanks for your time,

Bob Heller
3M Company



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

TCF & DOC

[Jon Griver]

Richard,

Firstly, I assume that you're referring to the EMC Directive.

You refer to "...particular essential requirements not covered by
harmonized standards."

If your product falls within the scope of a product specific harmonized
standard, or failing that, is covered by a generic harmonized standard,
then compliance with the harmonized standard is assumed to show compliance
with the essential requirements of the EMC Directive.
(This is a general statement. I don't know what your product is, so there
may be very special circumstances behind your statement).

If you do go the TCF route, your DoC should include the name of the
Competent Body that assessed your TCF, together with the number and date of
issue of the certificate the Competent Body issued.

Regards,


Jon Griver
i-Spec.com Ltd.
jgri...@i-spec.com

i-Spec, The Online Guide to Compliance
http://www.i-spec.com






>From: wo...@sensormatic.com
>To: emc-p...@majordomo.ieee.org
>Subject: TCF & DOC
>Date: Mon, 20 Dec 1999 08:21:33 -0500
>
>
>On all of our previous DoCs, we have declared compliance using harmonized
>standards. However, we now have a set of products where some harmonized
>standards exist and some do not. Therefore, we will use a Technical
>Construction File is used to support compliance with the particular
>essential requirements not covered by harmonized standards. What additional
>statements and information should appear on the DoC to support compliance by
>the TCF route for only some of the essential requirements?
>
>Richard Woods
>
>-
>This message is coming from the emc-pstc discussion list.
>To cancel your subscription, send mail to majord...@ieee.org
>with the single line: "unsubscribe emc-pstc" (without the
>quotes).  For help, send mail to ed.pr...@cubic.com,
>jim_bac...@monarch.com, ri...@sdd.hp.com, or
>roger.volgst...@compaq.com (the list administrators).
>
>
>


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: Ground lugs

[Andrews, Kurt]

Scott,

In the case of ITE equipment (UL 1950) UL does NOT require that each safety
ground that is stacked on top of the ground wire from the power inlet have
it's own star washer and nut. The ground wire from the power inlet IS
required to be on first with it's own star washer and nut. On top of this
nut you are allowed to attach as many other grounds as you like with only
one lockwasher and nut on top of them all. 
 
Kurt Andrews
Tracewell Systems, Inc.

-Original Message-
From:   Lacey,Scott [SMTP:sla...@foxboro.com]
Sent:   Monday, December 20, 1999 8:19 AM
To: 'goedd...@sensormatic.com'
Cc: 'emc-p...@ieee.org'
Subject:RE: Ground lugs


James,
Most equipment today uses crimp-on ring terminals, secured to a
ground stud
using a star washer and hex nut. The ground wire from the power
inlet goes
on first, and other safety grounds are stacked on top, each with its
own
star washer and nut. I have never had agency approval problems with
this
type of construction. You must use a "double crimp" ring terminal,
one that
grips the wire insulation securely.

If, for some reason, you must use the setscrew type lug, your best
bet would
be to have a batch of the commercial lugs tin plated. They are easy
to
dismantle once the setscrew is removed, and most large cities have
plating
houses. Tin is one of the easier (and cheaper) plating processes. I
completely agree that you must have a plate between the screw and
the wire.
I have seen wires almost cut in two by the other type.

Scott Lacey

> -Original Message-
> From: goedd...@sensormatic.com [SMTP:goedd...@sensormatic.com]
> Sent: Friday, December 17, 1999 2:09 PM
> To:   emc-p...@majordomo.ieee.org
> Subject:  Ground lugs
> 
> 
> Happy Holidays group,
> 
> In getting agency approval on our I.T.E. product, the safety
ground
> terminal
> has come into question. 
> When hard wiring a product, Para. 3.3.7 indicates that the
conductor is to
> be clamped between metal surfaces, and the terminal shall not
damage the
> conductor. This has been interpreted as the terminal must have a
metal
> plate
> that clamps down on the conductor, and no rotational stresses from
the
> screw
> are applied to the conductor. 
> 
> In Europe, I understand that a rail terminal block, where one of
the
> terminals is shorted to a rail, is generally used, and accepted,
but
> somewhat costly. There may also be alternatives, but we haven't
found an
> off
> the shelf one yet.
> 
> I am looking for a grounding terminal that accepts #14-#18 AWG
wire, has a
> clamping plate, is tin plated, and has a mount or hole for direct
> connection
> to a chassis. 
> 
> Since this has been so difficult a component to find, we had one
designed.
> Now my question is, "How is everyone else dealing with this ground
lug
> requirement? Is there a common component available that meets
these specs?
> The ground lugs in common use in the electrical industry do not
have the
> plate, and are copper or copper alloy.
> 
> Thank you for your assistance.
> 
> James Goedderz
> Sensormatic 
> 
> -
> This message is coming from the emc-pstc discussion list.
> To cancel your subscription, send mail to majord...@ieee.org
> with the single line: "unsubscribe emc-pstc" (without the
> quotes).  For help, send mail to ed.pr...@cubic.com,
> jim_bac...@monarch.com, ri...@sdd.hp.com, or
> roger.volgst...@compaq.com (the list administrators).
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Korean Immunity - What IS it??

[Grasso, Charles (Chaz)]

Hello,

Does anyone in this august body know what immunity
requirements need to be met?

Is the testing done in country?

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: Ground lugs

[Peter Merguerian]

Dear All,

Some of you might be surprised to hear that I have seen Class I (earthed)
units out there (large manufacturers of ITE) with UL/TUV marks but with no
connection from the terminal of the appliance inlet to the chassis. That
is, there was no stud or screw on the chassis but reliance was made on the
metal-to metal connection of the inlet body to the chassis. How is this
possible?




At 08:18 20/12/1999 -0500, Lacey,Scott wrote:
>
>James,
>Most equipment today uses crimp-on ring terminals, secured to a ground stud
>using a star washer and hex nut. The ground wire from the power inlet goes
>on first, and other safety grounds are stacked on top, each with its own
>star washer and nut. I have never had agency approval problems with this
>type of construction. You must use a "double crimp" ring terminal, one that
>grips the wire insulation securely.
>
>If, for some reason, you must use the setscrew type lug, your best bet would
>be to have a batch of the commercial lugs tin plated. They are easy to
>dismantle once the setscrew is removed, and most large cities have plating
>houses. Tin is one of the easier (and cheaper) plating processes. I
>completely agree that you must have a plate between the screw and the wire.
>I have seen wires almost cut in two by the other type.
>
>Scott Lacey
>
>> -Original Message-
>> From:goedd...@sensormatic.com [SMTP:goedd...@sensormatic.com]
>> Sent:Friday, December 17, 1999 2:09 PM
>> To:  emc-p...@majordomo.ieee.org
>> Subject: Ground lugs
>> 
>> 
>> Happy Holidays group,
>> 
>> In getting agency approval on our I.T.E. product, the safety ground
>> terminal
>> has come into question. 
>> When hard wiring a product, Para. 3.3.7 indicates that the conductor is to
>> be clamped between metal surfaces, and the terminal shall not damage the
>> conductor. This has been interpreted as the terminal must have a metal
>> plate
>> that clamps down on the conductor, and no rotational stresses from the
>> screw
>> are applied to the conductor. 
>> 
>> In Europe, I understand that a rail terminal block, where one of the
>> terminals is shorted to a rail, is generally used, and accepted, but
>> somewhat costly. There may also be alternatives, but we haven't found an
>> off
>> the shelf one yet.
>> 
>> I am looking for a grounding terminal that accepts #14-#18 AWG wire, has a
>> clamping plate, is tin plated, and has a mount or hole for direct
>> connection
>> to a chassis. 
>> 
>> Since this has been so difficult a component to find, we had one designed.
>> Now my question is, "How is everyone else dealing with this ground lug
>> requirement? Is there a common component available that meets these specs?
>> The ground lugs in common use in the electrical industry do not have the
>> plate, and are copper or copper alloy.
>> 
>> Thank you for your assistance.
>> 
>> James Goedderz
>> Sensormatic 
>> 
>> -
>> This message is coming from the emc-pstc discussion list.
>> To cancel your subscription, send mail to majord...@ieee.org
>> with the single line: "unsubscribe emc-pstc" (without the
>> quotes).  For help, send mail to ed.pr...@cubic.com,
>> jim_bac...@monarch.com, ri...@sdd.hp.com, or
>> roger.volgst...@compaq.com (the list administrators).
>> 
>
>-
>This message is coming from the emc-pstc discussion list.
>To cancel your subscription, send mail to majord...@ieee.org
>with the single line: "unsubscribe emc-pstc" (without the
>quotes).  For help, send mail to ed.pr...@cubic.com,
>jim_bac...@monarch.com, ri...@sdd.hp.com, or
>roger.volgst...@compaq.com (the list administrators).
>
>
>
+++
RTTE Directive Seminar
Renaissance Hotel, Tel-Aviv
12th January 2000. For details:
http://www.itl.co.il/RTTE.htm
+++


Peter Merguerian
Managing Director
Product Testing Division
I.T.L. (Product Testing) Ltd.
Hacharoshet 26, POB 211
Or Yehuda 60251, Israel

Tel: 972-3-5339022 Fax: 972-3-5339019
e-mail: pmerguer...@itl.co.il
website: http://www.itl.co.il 






-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

EN60204-1:1998 Title Published in the OJ Yet?

[MikSherman]

Hey folks --

Can anyone tell me if EN 60204-1:1998 has been published in the OJ yet in 
conjunction with the Machinery Directive?

(I've got copies of EN 60204-1:1992 and IEC 60204-1-1997; just wondering 
where the EU is on officially recognizing the latest version...)

thanks!
Mike Sherman
FSI International
msher...@fsi-intl.com

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Re: TCF & DOC

[Jim Hulbert]

The DOC should include "reference to the standards" used to determine
compliance.   However, a TCF by definition means you are not declaring
compliance via the standards route.  Rather,  compliance is declared after
assembling a technical construction file and having it assessed by a competent
body.   What we do in that case on the DOC is reference the TCF title and number
along with the name and address of the competent body that assessed the TCF.

Jim Hulbert
Senior Engineer - EMC
Pitney Bowes





wo...@sensormatic.com on 12/20/99 08:21:33 AM

Please respond to wo...@sensormatic.com

To:   emc-p...@majordomo.ieee.org
cc:(bcc: Jim Hulbert/MSD/US/PBI)

Subject:  TCF & DOC





On all of our previous DoCs, we have declared compliance using harmonized
standards. However, we now have a set of products where some harmonized
standards exist and some do not. Therefore, we will use a Technical
Construction File is used to support compliance with the particular
essential requirements not covered by harmonized standards. What additional
statements and information should appear on the DoC to support compliance by
the TCF route for only some of the essential requirements?

Richard Woods

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).









-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: 50/75 Ohm pads

[Price, Ed]

> -Original Message-
> From: Knighten, Jim L [SMTP:jk100...@exchange.sandiegoca.ncr.com]
> Sent: Friday, December 17, 1999 9:55 AM
> To:   emc-pstc list server (E-mail)
> Subject:  50/75 Ohm pads
> 
> 
> Does anyone know where I can purchase 50 Ohm to 75 Ohm coaxial impedance
> matching pads, with low loss that are fixtured for SMA to SMA, or APC
> 3.5mm
> to APC 3.5mm connectors?
> 
> Jim
> 
> Dr. Jim Knighten  e-mail: jim.knigh...@sandiegoca.ncr.com
>   
> Senior Consulting Engineer
> NCR
> 17095 Via del Campo
> San Diego, CA 92127   http://www.ncr.com   
> Tel: 858-485-2537
> Fax: 858-485-3788
> 
> * Notice the Area Code change from 619 *
> 
> 
Jim:

I'm assuming that you mean resistive T or PI matching pads. There's a
forgotten formula for calculating the minimum loss when matching Z1 to Z2,
but IIRC, for 50 to 75, the minimum loss is around 2.5 dB. So the fact that
you loose about half your power must be remembered. Resistive pads are best
for low power applications.

For low frequencies, you could just build some discrete resistors into a
little box. But SMA connectors is implying operating frequencies well into
the GHz region, so you need a cleaner technique. Most of the attenuators
that I have torn apart use a thin slab of ceramic as a carrier for thick
film printed resistors. So the resistors offer easy adjustment (only the
bold should try this; there is a host of little springs and gold plated
spacers and caps and shims inside).

But the manufacturer certainly realizes that he could make an attenuator
which also could function as a resistive match. Demand is probably low, but
try places like Weinschel, Mini Circuits Labs, Agilent, Kay, Microlab, JFW,
RLC and Pasternack.

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
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: TC85/WG11

[Matejic, Mirko]

Bob,

Charles Zegers, Secretary of US National Committee/IEC, 
tel: (212) 642-4936, e-mail: czeg...@ansi.org should be able to help you.

Mirko


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Korea EMI/EMS official gazette

[kohscp]

Hi group,
Get to know that there's some changes in Korea EMI requirement.
The checking for EMI label is no longer done at custom. They checking point
will now be in retail outlet.
The enforcement of EMS requirement will still remain at 1st Jan 2000.

Is there any official documents released from the authority?
Can anyone in the group point me to a source of such documents/information.
Is there a English version somewhere in www?

Regards
Koh



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

TC85/WG11

[reheller]

I have the cover page (only) of a Draft 8, October 1997 concerning
"Measurement of low frequency magnetic and electric fields with regard to
exposure of human beings - Special requirements for instruments and
guidance for measurements". Does anyone know if the committee still exists
(I believe that it is/was an IEC committee)? Or if their work was
finalized? Is there a contact at the IEC where I can find out the members
of committees?

Thanks for your time,

Bob Heller
3M Company



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

TCF & DOC

[WOODS]

On all of our previous DoCs, we have declared compliance using harmonized
standards. However, we now have a set of products where some harmonized
standards exist and some do not. Therefore, we will use a Technical
Construction File is used to support compliance with the particular
essential requirements not covered by harmonized standards. What additional
statements and information should appear on the DoC to support compliance by
the TCF route for only some of the essential requirements?

Richard Woods

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: Ground lugs

[Lacey,Scott]

James,
Most equipment today uses crimp-on ring terminals, secured to a ground stud
using a star washer and hex nut. The ground wire from the power inlet goes
on first, and other safety grounds are stacked on top, each with its own
star washer and nut. I have never had agency approval problems with this
type of construction. You must use a "double crimp" ring terminal, one that
grips the wire insulation securely.

If, for some reason, you must use the setscrew type lug, your best bet would
be to have a batch of the commercial lugs tin plated. They are easy to
dismantle once the setscrew is removed, and most large cities have plating
houses. Tin is one of the easier (and cheaper) plating processes. I
completely agree that you must have a plate between the screw and the wire.
I have seen wires almost cut in two by the other type.

Scott Lacey

> -Original Message-
> From: goedd...@sensormatic.com [SMTP:goedd...@sensormatic.com]
> Sent: Friday, December 17, 1999 2:09 PM
> To:   emc-p...@majordomo.ieee.org
> Subject:  Ground lugs
> 
> 
> Happy Holidays group,
> 
> In getting agency approval on our I.T.E. product, the safety ground
> terminal
> has come into question. 
> When hard wiring a product, Para. 3.3.7 indicates that the conductor is to
> be clamped between metal surfaces, and the terminal shall not damage the
> conductor. This has been interpreted as the terminal must have a metal
> plate
> that clamps down on the conductor, and no rotational stresses from the
> screw
> are applied to the conductor. 
> 
> In Europe, I understand that a rail terminal block, where one of the
> terminals is shorted to a rail, is generally used, and accepted, but
> somewhat costly. There may also be alternatives, but we haven't found an
> off
> the shelf one yet.
> 
> I am looking for a grounding terminal that accepts #14-#18 AWG wire, has a
> clamping plate, is tin plated, and has a mount or hole for direct
> connection
> to a chassis. 
> 
> Since this has been so difficult a component to find, we had one designed.
> Now my question is, "How is everyone else dealing with this ground lug
> requirement? Is there a common component available that meets these specs?
> The ground lugs in common use in the electrical industry do not have the
> plate, and are copper or copper alloy.
> 
> Thank you for your assistance.
> 
> James Goedderz
> Sensormatic 
> 
> -
> This message is coming from the emc-pstc discussion list.
> To cancel your subscription, send mail to majord...@ieee.org
> with the single line: "unsubscribe emc-pstc" (without the
> quotes).  For help, send mail to ed.pr...@cubic.com,
> jim_bac...@monarch.com, ri...@sdd.hp.com, or
> roger.volgst...@compaq.com (the list administrators).
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Re: Ground lugs

[Matthew Meehan]

> Happy Holidays group,
>
> In getting agency approval on our I.T.E. product, the safety ground
terminal
> has come into question.
> When hard wiring a product, Para. 3.3.7 indicates that the conductor is to
> be clamped between metal surfaces, and the terminal shall not damage the
> conductor. This has been interpreted as the terminal must have a metal
plate
> that clamps down on the conductor, and no rotational stresses from the
screw
> are applied to the conductor.

Hi James,
Not clear what the problem is here.  "Rotational stresses"?  Is the
conductor being visably damaged by your terminal?  If not, sounds like
someone's getting a little overzealous.

The clamping plate you refer to is used to secure the conductor - not to
prevent
"rotational stresses from the screw".

Additionally, European standards such as EN60947 recognize, and even contain
drawings of the type of terminal you describe - without clamping plates.
Problem is, if you show this to your agency, they may decide they want to
carry
out testing according to the requirements of the standard (EN60998/999 are
probably more appropriate in this case).

Rather than worry about "rotational stresses" - I would be more worried
about
long term security.  Is it really a screw terminal, or is it a stud (bolt)
terminal?
In the case of a screw type terminal for PE, I would generally expect to see
a
stud terminal with a bolt, a clamping plate, and a spring (lock) washer.

If you feel confident about your terminal  however, crimp a terminal lug to
the conductor.  This should solve your problem with the agency about
"rotational stresses".

> In Europe, I understand that a rail terminal block, where one of the
> terminals is shorted to a rail, is generally used, and accepted, but
> somewhat costly. There may also be alternatives, but we haven't found an
off
> the shelf one yet.

"Somewhat costly" is an interesting expression.  I've heard this and
"relatively
expensive" both offered as reasons when designers don't want to change
their design.  Can anyone give me a rough idea (perhaps as a percentage of
unit cost) of what "somewhat costly" mean?

> I am looking for a grounding terminal that accepts #14-#18 AWG wire, has a
> clamping plate, is tin plated, and has a mount or hole for direct
connection
> to a chassis.

Most of the approved terminals I know of are for rail mounting (DIN...).
Don't
think it would make too much sense to install a rail just for one PE
terminal.
If you're looking for rail mounted terminals however, check Weidmueller and
Wago.  Both companies offer PE terminals that can be snapped onto a carrier
rail.  Worth a look if you're including many terminals in your equipment.

Good luck,
Matt



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).