from:"Ed Eszlari"

Re: Dielectric withstand voltage for power supplies

2003-06-26 Thread Ed Eszlari

Peter,

Most PC power supplies evaluated according to EN60950 or IEC60950 use Basic
insulation from the Primary circuitry to the earthed chassis or earthed parts
(Class I). They also use Reinforced insulation from Primary to Secondary
(Input to Output). If you happen to locate a Class II power supply with a
conductive, user accessible enclosure, Reinforced insulation is used from
Primary to the accessible part.

During the product evaluation these insulations are tested at 1500VAC  or
2121VDC for Basic insulation, and 3000VAC or 4242VDC for reinforced insulation.

Production line testing requires testing of the basic insulation at the above
voltage and a ground continuity test for the chassis.

As a basic rule for power supplies incorporating hazardous voltages in the
primary, any user accessible area or connector that is not earthed requires
Reinforced insulation from Primary to Secondary.

Ed 



From: Peter Horvat 
Reply-To: Peter Horvat 
To: 'emc-p...@ieee.org' 
Subject: Dielectric withstand voltage for power supplies 
Date: Thu, 26 Jun 2003 09:36:44 -0400 
 
 
Hi, 
 
Can anyone explain the electrical strength requirements for PC power 
supplies (input/output) to comply with EN60950. Does basic insulation or 
reinforced insulation apply? Particularly in the case that the PC 
peripherals and male D-sub connectors (that can come in contact with users) 
are only basic insulated PS suitable. 
 
I found that most power supplies available on the market are only tested at 
1500VAC between in/out. 
 
Thank you in advance for your help, 
 
Peter Horvat 
CAE Inc. 
 
 
 
 
 
 
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RE: FDA registration of laser

2003-06-16 Thread Ed Eszlari

We had the same question and requested an answer from Jerome Dennis at CDRH.
Mr. Dennis referred us to Laser notice No. 42 which in the last paragraph
states:

Distributors of laser products must only comply with the recordkeeping
requirements of part 1002. Distributors need not submit initial and annual
reports described in part 1002 nor apply new certification and identification
labels to the outside of the final product.

 

Ed

Edward Eszlari

Product Safety Engineer

Bose Corporation



From: FastWave 
Reply-To: FastWave 
To: 'Kim Boll Jensen' , EMC-PSTC 
Subject: RE: FDA registration of laser 
Date: Wed, 11 Jun 2003 07:50:34 -0400 
 
 
No registration is required if: 
1) You put a Class I laser product into your product (in its entirety) and 
your product is Class I. 
2) You include the documentation that came with the laser product with your 
product. 
3) You leave all the labeling on the laser product as you received. 
 
There is an official variance published by the CDRH that outlines this - I 
will find dig this up and forward to. 
 
Regards, 
 
Bill Bisenius 
EDD, Inc. 
bi...@productsafet.com 
www.productsafeT.com 
 
 -Original Message- 
From: Kim Boll Jensen [mailto:k...@bolls.dk] 
Sent: Wednesday, June 11, 2003 4:55 AM 
To: EMC-PSTC 
Subject: FDA registration of laser 
 
  File: Kort for Kim Boll Jensen  Hi all good people 
 
Just a simple question. 
 
When using a CD or DVD driver in a product (PC or audio product) and the 
driver is FDA registered, do I need to register the final product at FDA 
too. I can't find a paragraph in 21 CFR which tells me when not to 
register. 
 
(The drives are Class I but includes a higher laser internally as fare 
as I know) 
 
 
Best regards, 
 
 
Kim Boll Jensen 
Bolls Raadgivning 
Denmark 
 
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Re: 48 Volt Telco Power Supply

2002-08-15 Thread Ed Eszlari



Hi Jim,
Transistor Devices makes standard and custom power supplies for many applications including Telecom. http://www.tdipower.com/
Good luck.
Ed

From: Jim Robson 
Reply-To: Jim Robson 
To: "'EMC-PSTC - forum'" 
Subject: 48 Volt Telco Power Supply 
Date: Fri, 9 Aug 2002 14:46:59 -0700 
 
 
 
Hello Group, 
 
Does anyone in the group know of a good supplier of 48 VDC Telco power 
supplies? 
 
My requirements: 
 
Input 120/240 VAC (universal or switchable) 
Output 48 VDC 
Power 750 watts 
Mounting 19 inch rack 
 
Thanks in advance, 
Jim Robson 
Compliance Eng. 
Zetron Inc. 
 
 
 
 
 
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Re: International Power Requirements

2002-02-20 Thread Ed Eszlari



Here is another one:
http://www.kropla.com/electric2.htm
Ed

From: oover...@lexmark.com 
Reply-To: oover...@lexmark.com 
To: emc-p...@majordomo.ieee.org 
Subject: International Power Requirements 
Date: Wed, 20 Feb 2002 11:23:02 -0500 
 
 
Check out this website for power requirements, plug styles, and languages. 
 
Look under South Korea for Korea. 
 
ftp://ftp.lexmark.com/pub/networking/internat.htm 
 
 
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Re: Flammabilty requirement for cloth used on loudspeaker / UL6500

2002-02-19 Thread Ed Eszlari



I have heard the "lilly" tablets can be purchased at Target stores, although I have not yet verified this.
Ed

From: Rich Nute 
Reply-To: Rich Nute 
To: e.l...@wanadoo.fr 
CC: emc-p...@majordomo.ieee.org 
Subject: Re: Flammabilty requirement for cloth used on loudspeaker / UL6500 
Date: Wed, 13 Feb 2002 13:35:17 -0800 (PST) 
 
 
 
Hi Pierre: 
 
 
  Unfortunately, Hexamine is temporarely unavailable from IMSPLUS, and, 
  furthermore, this product cannot be sold outside the US. 
  
  If somebody knows another source, he's welcome ! 
 
I did a Google search and found at least one more source: 
 
 http://www.omahas.com/store/commerce.pl?product=Messkits 
 
I believe there are some Euro sources in the Google results, 
but I did not check all the listed sources. 
 
 
Good luck and best regards, 
Rich 
 
 
 
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Re: TNV-2 to Earth requirement

2002-01-18 Thread Ed Eszlari

Hi everyone and thanks for all of the info thus far.
Here is some more info on the filter: The input to the filter derives it's power from batteries at a C.O. The output is meant to power telecom equipment. The input and output are considered TNV-2. Now even though the filter inputis considered a secondary circuit, has anyone also considered that there will be a battery charger in that circuit charging the batteries? The battery charger is mains connected and is required to have reinforced insulation from the mains input to the output. Therefore I believe if everyone agrees the DC filter does require supplemental insulation to earth, the battery charger should also meet this requirement.
I have read clause 6 over and over, and in my opinion supplemental insulation is required (for Norway and Sweden) from this TNV-2 circuit toearth regardless of the filter being connected to the mains or not. It's just funny how these clauses are worded because they mainly seem to refer to mains connected products (permanently connected, pluggable type B, etc.).
Ed

From: "Ron Pickard" <rpick...@hypercom.com>
To: davehe...@mediaone.net 
CC: bosesaf...@hotmail.com, t...@world.std.com, emc-p...@ieee.org 
Subject: Re: TNV-2 to Earth requirement 
Date: Thu, 17 Jan 2002 16:20:14 -0700 

Hi Dave, 

According to Annex B of ETSI document EG 201212 "Electrical safety; Classification of interfaces for 
equipment to be connected to telecommunication networks": 
"48 Volt" Station Battery is to be considered as SELV where Vmax = 57Vdc. 
"60 Volt" Station Battery is to be considered as TNV-2 where Vmax = 75Vdc. 

As Ed described the input as going up to 72Vdc, then, IMHO, this circuit should be classified as 
TNV-2 with the above reference and with the TNV-2 circuit definition found in IEC/EN/UL60950. Also 
see clause 5.3 of EG 201212 for user information recommendations. 

The above assumes that Ed's product connects to a telecommunication network. 

Please note that as the EG of EG 201212 refers to "ETSI Guide" (see the foreward), its hardly a 
regulatory requirement, however, it is a useful document that provides guidance for the 
classification of most TNV type circuits. And, it can be downloaded for free from the ETSI site. 

I hope this helps clarify this issue. Comments? 

Best regards, 

Ron Pickard 
rpick...@hypercom.com 

 davehe...@mediaone.net 
 Sent by: To: bosesaf...@hotmail.com 
 owner-emc-pstc@majordom cc: t...@world.std.com, emc-p...@ieee.org 
 o.ieee.org Subject: Re: TNV-2 to Earth requirement 

 01/17/02 02:33 PM 
 Please respond to 
 daveheald 

Does your equipment plug into a primary (AC) circuit? Any TNV circuit 
is considered a secondary circuit and if any and all power is derived 
from the TNV network, the notes you referenced would not apply as a 
primary circuit is not present. 

Best Regards, 
Dave Heald 

Ed Eszlari wrote: 

  All, 

  I have a DC to DC "filter" which is rated 32 - 72 VDC input and output 
  which I am considering to be TNV-2 according to EN60950/IEC60950 2nd 
  edition. 

  This filter has a metal chassis which is earthed, and it will be 
  installed in a service access area only by qualified service 
  personnel. It is not permanently connected or pluggable type B, and 
  does not have a provision for a permanently connected earthing 
  conductor. With all this considered, it seems that Norway and Sweden 
  are the only Countries that require Supplemental insulation for a 
  primary circuit between this TNV-2 circuit and earth. 
  Is there any way around this requirement due to this filter operating 
  at 72VDC and not being directly connected to mains? 

  Any help would be appreciated. 

  Ed 

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TNV-2 to Earth requirement

2002-01-17 Thread Ed Eszlari

All,

I have a DC to DC "filter" which is rated 32 - 72 VDC input and output which I amconsidering to beTNV-2 according to EN60950/IEC60950 2nd edition.

This filter has a metal chassis which is earthed, and it will be installed in a service access area only by qualified service personnel. It is not permanently connected or pluggable type B, and does not have a provision for a permanently connected earthing conductor. With all this considered, it seems that Norway and Sweden are the only Countries that require Supplemental insulation for a primary circuit between this TNV-2 circuit and earth.
Is there any way around this requirement due to this filter operating at 72VDC andnot being directlyconnected to mains?

Any help would be appreciated.

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Re: [Fwd: clearance and working voltage]

2001-11-29 Thread Ed Eszlari

I also agree with the 4.4mm reinforced and 2.2mm basic/supp. calculation. I will assume that there is a creepage requirement also and would use pollution 1 in this application as long as the enclosure does not have openings.
Ed

From: vit...@aol.com 
Reply-To: vit...@aol.com 
To: , 
CC: 
Subject: Re: [Fwd: clearance and working voltage] 
Date: Wed, 28 Nov 2001 21:51:04 EST 

Rich and Xing, 

No arguments from me about the clearance of 4.4 mm for reinforced. The other 6.4 mm clearance requirement is probably a misapplication of the clarance rules using the 840 v peak row of Table 3H. 

I think the original question may also need to consider creepage requirements. Then again, maybe not. Can the inside of an ac adapter be considered a pollution degree 1 environment? If so, the creepages are determined using the clearance table. Has anyone taken this approach? I presume no ventillation openings are allowed? How good a seal is needed for the enclosure halves and connectors/output cables? 

vgl 

In a message dated Wed, 28 Nov 2001 7:50:37 PM Eastern Standard Time, Rich Nute writes: 

  Hi Xing Weibing: 

  Here is my answer to the question. 

   Hi group I have a question regarding clearance and working voltage of 
   IEC60950. If I HAVE A AC ADAPTER(AC 100-240V 50/60Hz) ,THE WORKING 
   VOLTAGE MEASURED ARE AS FOLLOWS: Nominal supply voltage: AC240V PRIMARY 
   AND SECONDARY : 364V(RMS), 540V(PEAK) MEASURED clearance: 5.3mm I HAVE 
   READ SOME CB TEST REPORT FOR THIS THIS SITUATION: SOME REQUIRE: MINIMUM 
   CLEARANCE 4.0+0.4mmother require: minimium clearance 6.4mm which is 
   correct for this situation? regards Xingwbbtiep2001-11-28 

  Since the product is an adapter, I will assume that 
  the question addresses clearance between the mains 
  circuit and a SELV secondary circuit. 

  I will also assume that the applicable standard is 
  IEC 60950, either 

  2nd Ed (Tables 3 and 4) or 
  3rd Ed (Tables 2H and 2J). 

  The parameters are: 

  nominal mains voltage: 240 V rms 
  340 V peak 
  working voltage: 364 V rms 
  540 V peak 

  The problem is confused because there is 

  a set of requirements for working voltage, 
  in Table 3/H, and 

  a set of requirements for peak working voltage, 
  Table 4/2J. 

  (The 2nd Ed. refers to "repetitive peak voltage;" 
  the 3rd Ed refers to "peak working voltage.") 

  According to the standard, if the peak value of the 
  working voltage exceeds the peak value of the mains 
  voltage, then the working voltage in Table 3/2H is 
  taken as the mains voltage. Then, the peak working 
  voltage (aka repetitive peak voltage) is used in 
  Table 4/2J. 

  In the example, the peak value of the working voltage 
  exceeds the peak value of the mains voltage. 

  The minimum clearance in Table 3/2H for 240 V mains 
  and 240 V working is: 

  4.0 mm reinforced 
  2.0 mm basic/supplementary 

  The additional clearance in Table 4/2J for 240 V mains 
  and 540 V peak is: 

  0.4 mm reinforced (567 V peak) 
  0.2 mm basic/supplemenatry (567 V peak) 

  So, the total clearance is: 

  4.4 mm reinforced 
  2.2 mm basic/supplementary. 

  Arguments? Another view or interpretation? 

  Best regards, 
  Rich 

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Re: definition of off

2001-11-26 Thread Ed Eszlari

UL and TUV will accept an amplifer mute and display turn off as an off condition as long as it is done without human intervention at the time of switching, no input power requirement. CSA will not, and has stated that the product should either be disconnected from the mains or the secondary circuitry shall be disconnected and the input power in the off state shall be less than 15W.
Ed

From: "Lou Aiken" 
Reply-To: "Lou Aiken" 
To: "Colgan, Chris" , "'Emc-Pstc' (E-mail)" 
Subject: Re: definition of "off" 
Date: Thu, 22 Nov 2001 12:37:23 -0600 

According to my understanding of 950, which is much better than 65, I believe a product must be safe, "within the meaning of the standard" during unattended operation and also when unattended in so-called "off" mode. 

Consequently, the status of the product when in the off mode, should be determined by the manufacturer, and the safety authorities should show little interest. 

Regards, Lou 

Lou Aiken 
27109 Palmetto Drive 
Orange Beach, AL 
36561 USA 
tel +1 251 981 6786 
fax +1 251 981 3054 
mobile +1 251 979 4648 
 - Original Message - 
 From: Colgan, Chris 
 To: 'Emc-Pstc' (E-mail) 
 Sent: Thursday, November 22, 2001 8:20 AM 
 Subject: definition of "off" 

 What is clear from IEC60065 is that if a product is capable of being 
 switched on or off or both by a timer or a data link, a front panel 
 mechanically operated switch is not required. What is not clear is the 
 definition of off. 

 Has anyone been given a definition, preferably by a CTL member or the like? 

 Cheers 

 Chris Colgan 
 Compliance Engineer 
 TAG McLaren Audio Ltd 
 The Summit, Latham Road 
 Huntingdon, Cambs, PE29 6ZU 
 *Tel: +44 (0)1480 415 627 
 *Fax: +44 (0)1480 52159 
 * Mailto:chris.col...@tagmclaren.com 
 * http://www.tagmclaren.com 

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Re: IP xx

2001-06-25 Thread Ed Eszlari




Amund, 
The answer to your question is somewhat tricky since you mention the product (radio/tele cabinet) and reference EN60950.
The standard for audio/video equipment is IEC60065/EN60065. In a nutshell, this standard does not specify openings, but as long as the test probes cannot contact hazardous live parts you should be OK. As an example para 9.1.3 states that a test pin 4mm x 100mm shall not contact hazardous parts when suspended freely from one end as it is inserted into the openings.
EN60950 (information technology equipment) states these requirements in para 4.3.14, 4.3.15, and 4.3.16. The general rule is 5mm max. or 1mm in width regardless of length. It is possible to have openings in excess of these limits if you use the 5 degree rule as stated in 4.3.16 only for side openings.
As for IP requirements, EN60950 states them in para 1.1.2, and in Annex T, IEC60065/EN60065 states them in Annex A.
The paragraphs for EN60950 may be slightly different than stated above since I happen to have an older version of the standard in front of me.
Depending on the type of equipment you have either or both of the standards can apply. Refer to the scope of each standard for assistance.
Regards,
Ed


From: am...@westin.org 
Reply-To: am...@westin.org 
To: emc-p...@majordomo.ieee.org 
Subject: IP xx 
Date: 25 Jun 2001 09:25:41 - 
 
 
Hi all, 
 
Ventilation holes in a radio/tele cabinet, what are the maximum dimensions? 
According to EN60950, we cannot see any IP requirements? 
 
Any suggestions? 
 
Best regards 
Amund Westin, Oslo, Norway 
 
 
-- 
Get your firstname@lastname email for FREE at http://Nameplanet.com/?su 
 
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Re: Transformer question

2001-06-18 Thread Ed Eszlari




Zohar,
If the power supply was approved by UL, get a copy of the UL descriptive report which should list the transformer temp. rating. You can also check the test report under para 5.1 (heating), the table in 1.5 (components), and Annex C (transformers). 
You may also want to review the installation instructions to verify that you are providing the correct amount of cooling to the supply in your installation and operating at the ambient temperature as described in the agency test report.
Regards,
Ed

From: Zohar Zosmanovich 
Reply-To: Zohar Zosmanovich 
To: 'Emc-Pstc (E-mail) 
Subject: Transformer question 
Date: Mon, 18 Jun 2001 08:38:48 +0200 
 
 
Hello, 
 
I have a unit consist of metal enclosure and open frame AC/DC power supply, 
approved to UL/IEC 950. 
P.S includes PRI/SEC Transformer marked B/130 (Class B/130 deg.C). 
During Heating Test, transformer winding temperature exceeds class A limits 
(65 deg.C max. temperature rise). There is no mention about transformer 
class in UL report (class of insulation system) or in TUV certificate (but 
the power supply manufacture says it is class B). 
 
What class should I consider this transformer to be? 
 
Thanks 
 
 
 
Zohar Zosmanovich 
Compliance Engineer 
RadWin (The Wireless Alternative) Ltd. 
 
E-mail: zohar_zosmanov...@radwin.com 
RADWIN Ltd. 34 Habarzel St., Tel-Aviv 69710, Israel. 
Tel.: 972-3-7666735 Fax.: 972-3-7657535 
 
 
 
 
 
 
 
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Re: EN60950 (UL1950, IEC 60950) On off switch marking.

2001-05-01 Thread Ed Eszlari

Rick,
If you are using IEC950 you can mark the switch I/O, if you are using IEC60065 you are only allowed to mark a single pole switch with the I (on) symbol. 
Ed

From: Rick Linford 
Reply-To: Rick Linford 
To: 
Subject: EN60950 (UL1950, IEC 60950) On off switch marking. 
Date: Fri, 27 Apr 2001 10:25:19 -0600 

Hi All, 

When a switch opens only one leg of the mains to control power to 
equipment should it be marked with the l and O? 

Background: 

Three different engineers from three different NRTLs indicated it is 
permitted, two even required it. A different engineer for one of the 
NRTLs and two other respected individuals indicate it is prohibited. It 
will be interesting if members of this list will have the same 50/50 
split or if there is a correct answer. 

(single phase 100 to 240 VAC, 2A, 50-60 Hz, intended to be shipped US, 
Canada, EU and generally internationally) 

To help, IEC 60950 (1999), section 1.7.8.3 Symbols, is shown below. 

Where symbols are used on or near controls, for example switches, push 
button, etc., to indicate ON OFF conditions, they shall be the line 
l for ON and the circle O for OFF (60417-1-IEC-5007 and 
60417-1-IEC-5008). For push-push type switches the symbol {line in side 
the circle} shall be used (60417-1-IEC-5010). 

It is permitted to use the symbols O and l to indicate the OFF and 
ON positions of any primary or secondary power switches, including 
isolating switches. 

A STAND-BY condition shall be indicated by the symbol {line breaking 
the circle at the top} (60417-1-IEC-5009). 

My bias was not included in the 50/50 statistics noted above but I 
believe it is required. 

Rick Linford 
Regulatory Engineer 
SonicWALL 

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RE: DC/DC Convertors for CO Equipment