Re: Dielectric withstand voltage for power supplies

[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

[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 
>ED&D, 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

[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

[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

[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

[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 input is 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 to earth 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" 
>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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> > Bacher: 

TNV-2 to Earth requirement

[Ed Eszlari]

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.
 
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Re: [Fwd: clearance and working voltage]

[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"

[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

[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

[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.

[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

[Ed Eszlari]

Jody,
How can you consider the C/O DC output SELV when the battery charger float voltage exceeds the SELV limits (72VDC)? I believe this is why the DC/DC converters are rated up to 72VDC. I have always considered the 72V input a hazardous secondary voltage, and either required reinforced insulation to the converter output, or used operational insulation input to output and considered the converter output to be SELV when the input is 60VDC. The installation and use would then be up to the end user.
Also, in order to have a SELV output the battery charger must be isolated from the mains by reinforced insulation.
Ed

>From: Jody Leber 
>Reply-To: Jody Leber 
>To: "'Peter Merguerian'" , "\"EMC-PSTC (E-mail)\" <" 
>Subject: RE: DC/DC Convertors for CO Equipment 
>Date: Tue, 1 May 2001 08:28:22 -0400 
> 
> 
>Peter, 
> 
>The centralized DC output is considered SELV with no testing. 
> 
>Best Regards, 
> 
>Jody Leber 
>Laboratory Manager 
> 
>jle...@ustech-lab.com 
>http://www.ustech-lab.com 
> 
>U. S. Technologies 
>3505 Francis Circle 
>Alpharetta, GA 30004 
> 
>770.740.0717 
>Fax: 770.740.1508 
> 
> 
>-Original Message- 
>From: Peter Merguerian [SMTP:pmerguer...@itl.co.il] 
>Sent: Tuesday, May 01, 2001 7:22 AM 
>To: "EMC-PSTC (E-mail)" < 
>Subject: DC/DC Convertors for CO Equipment 
> 
> << File: ATT9.txt; charset = windows-1255 >> 
> 
> 
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Re: Spacings Issue

[Ed Eszlari]

 
Hello Ken, 

 

First of all the "floating secondary ground" (if not connected directly to earth) should be treated as part of the secondary circuit which in many cases will require reinforced insulation to the primary circuit according to the working voltage measured.  Next, in most applications, the secondary circuitry can be cap coupled to earth ground and does not require basic insulation spacings for a primary circuit. I have seen equipment which incorporates TNV circuitry that does require supplemental insulation spacing at the primary working voltage from the TNV to earth due to Nordic Country deviations. I believe this is required due to poor earthing in these countries, and the thought is that if the safety earth was removed, reinforced insulation will remain between the primary circuitry and the TNV (basic + supplemental = reinforced). This is the information I had received in the past, but maybe some others in the group can provide you with more information.
 
Ed
 
>From: "Matsuda, Ken" 

>Reply-To: "Matsuda, Ken" 

>To: emc-p...@ieee.org 

>Subject: Spacings Issue 

>Date: Mon, 18 Dec 2000 18:37:22 -0500 

> 

> 

> 

>Hello Group, 

> 

>A circuit uses a floating ground in the secondary, and caps are used for 

>protection from the secondary outputs to earth ground. The question is, 

>under spacings requirements, would the secondary have to meet the high 

>voltage requirements for spacings for primaries due to this earth ground. 

>A few agencies have expressed desires to short the primary to secondary and 

>require the the secondary to meet primary voltage spacings to this earth 

>ground trace. 

> 

>Any help would be greatly appreciated. And thanks again for all your 

>opinions 

> 

> 

> 

>Thanks, 

> 

>Ken Matsuda 

> 

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Re: Class I laser

[Ed Eszlari]

Hello Zohar,

IEC 60825 will provide you with all of the marking and classification info 
for a product that is shipped worldwide.


The Code of Federal Regulations, Title 21, Chapter 1, Subchapter J will give 
you the requirements for the US.


You should also check your end product test standard for any additional 
requirements.


Ed


From: Zohar Zosmanovich 
Reply-To: Zohar Zosmanovich 
To: "'emc-p...@majordomo.ieee.org'" 
Subject: Class I laser
Date: Mon, 18 Dec 2000 10:45:16 +0200



Hi,

My product includes a Class I laser. What are the comments and cautionary
symbols that need to be added to Safety/Installation Manual.


Thanks

Zohar (Jana) Zosmanovich
Compliance Engineer, RADWIN ltd.
Email: 




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