RE: New CISPR22 requirement

Yea, I do. This is going to add time and cost to the test procedure in place and I don't see it fixing any problems. I might concede that it may be a more repeatable reading on cables, but that is secondary to the real issue. The real issue is this. Is the lack of this testing causing a pr

RE: Crepage/Clearance On Telecom Modem design

I believe that your experts are wrong...4.2 is a rather odd number to come up with. The most common requirement here is SUPPLEMENTARY INSULATION for a PRIMARY CIRCUIT at 250Vrms (as defined by EN 60950) between the TIP/RING (line side, or TNV-3 side) and the modem or device side. 2.5mm of surfa

Re: Crepage/Clearance On Telecom Modem design

Hello Diaco: My reading of Clause 6 of IEC 950/EN 60950 is: between TNV circuit and primary circuit: double or reinforced insulation, including applicable creepage distance and clearance, or basic insulation and a grounded conductive barrier, including ap

RE: Crepage/Clearance On Telecom Modem design

In most cases, Norway, Sweden and Finland? require supplementary insulation for a primary circuit between TNV and Ground\/SELV. Assuming a primary circuit of 250VAC, I believe this works out to 2.5mm creepage and 2.0mm for clearance (I don't have my standard handy). In addition, you need 0.4mm th

RE: Ozone...

Hi Ed. Oh I see you've been sniffing that stuff then Chris - 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...@cu

RE: New CISPR22 requirement

Hello R. Grant, The Cenelec version of CISPR 22:1997 has been released in September. I believe it has been (provided that no one has submitted protest) offered to the Commission (DG III) for publication in OJEC, it was ratified in the 96th Technical Board meeting in July 1998. It contains the sam

Re: Crepage/Clearance On Telecom Modem design

Hello Diaco It depends on which countries you're targeting, but I would have thought that 1.5 mm would be adequate for most European countries that are using EN60950 amendment 4. Regards Barry Esmore -- > From: Diaco Davari > To: emc-p...@majordomo.ieee.org > Subject: Crepage/Clearance

RE: Crepage/Clearance On Telecom Modem design

Glen, Norway, Sweden and Finland are correct. The Finish deviation for this is somewhat hidden, it is in clause 6.2.1.4, where it states that Earth Ground is not permitted as a level of protection between Mains and TNV. Double (BASIC + SUPPLEMENTARY) or REINFORCED INSULATION between is all th

Feeding 2 phases into one telco rack

Members, Can anyone enlighten me whether reugulations exist in EU countries ( Excepting the UK) which advise against or prohibit the practice of feeding duplicated powere supplies from different 230 V phases into the same shelf or rack of telco TDM ( or any) equipment. The UK regs

SLIM

I have an electronic (WORD) copy of the SLIM document. REPORT OF THE SLIM III TEAM ON THE ELECTROMAGNETIC COMPATIBILITY DIRECTIVE (89/336/EEC as amended) Please email me if you would like a copy. Keith L. Nicholas Manager, Electrical Controls AMP Incorporated, Autom

RE: Lab qualification

ISO/DIS is available at: http://web.ansi.org/reports/master.asp?room=22 -Original Message- From: Matejic, Mirko [SMTP:mmate...@foxboro.com] Sent: Wednesday, October 07, 1998 7:07 AM

RE: Room grounding

'Single point ground' in this situation is used for the same purpose as we would in electronics design. When using a shielded room for making low frequency measurements (particularly MIL-STD), multiple ground connections can make significant power frequency and harmonic noise. Generally this is

RE: Ozone...

Can somebody confirm information I picked on the radio that each Shuttle launch causes a major damage in the Ozone layer? Mirko Matejic - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscri

RE: SLIM

You should post it in the contributed document section of the RCIC. Monty Griffith Senior Product Safety Engineer Intergraph Computer System Huntsville, AL 35894-0001 PH: (256) 730-6017 FX: (256) 730-6239 http://mecsrv.b29.ingr.com > -Original Message- > From: Nicholas, Keith L [SMTP:keit

ThanX from The Safety Link (A Milestone!)

Hello PSTCers, Last night the 100,000th visitor entered the Safety Link (the web's most comprehensive collection of electrical product safety and standards resources.) Our counter was started towards the end of 1995. 40,000+ have visited in the past year and the rate continues to climb. ThanX

IEC 1000-X-X vs EN 61000-X-X

Hello group, I currently have a number of the IEC 1000-X-X standards and test in accordance with them, EN 50082-1:1997 references the EN 61000-X-X standards. Can I safely continue to use my IEC 1000-X-X set or do I have to buy the EN 61000 series. any comments appreciated Thanks Jeff Bailey

Re: Shield Room Grounding

Hi Ed, I appreciate your kindness to share your experience with us about constructing equivalent load: "I constructed a load bank consisting of 16 surface mount light bulb sockets, all wired in parallel. I just screw in an array of 25/60/75/100 Watt rated lamps until I get the necessary current

Two diverse questions

* Sound pressure measurements - What standard drives those requirements? * TNV3 connectors are BNC types - are their connectors that can provide higher density connections than 1? - given the nature of coax this seems counter-intuitive but I am passing the request for information. -

Re: Crepage/Clearance On Telecom Modem design

Hello Diaco, As you can see from all the responses to your question, you have received many contradictory answers! As the Israeli member of the IEC 950 WG7 Committe, I would like to provide you with the correct answer. However, I would first need you to provide me with details of what a DAA mo

SLIM (Again)

Well, attaching it didn't work (The server filtered it because it had an attachment). I'm still getting requests every 5 to 10 minutes so now I've placed it on the RCIC web site (thanks to Monty Griffith). Just Go Here http://www.rcic.com/ and click the button that says download. The file name is

Radiation Hazard Monitors

Sorry to bring this up again. Unfortunately when the sources for radiation monitors were being discussed I was not interested in buying one, and deleted all those messages. Now I am looking for a handheld meter, with magnetic field probe preferably capable of 100

Two diverse questions

To my knowledge, Germany is the only country that has an acoustics "law" that affects routine ITE. The German Workplace Law sets limits in the 60+dBA? range for workplaces. OSHA also sets limits, but they begin (as I recall) around 85dBA, and well above routine ITE noise. Where acoustic levels a

Two diverse questions

[Correction to prior note below. German limits are for imission as opposed to emission. It is the total sound pressure as measured at the worker's location. Therefore, it is the employer who is held accountable to provide equipment, drapes, carpet, or whatever that helps meet the limits.] To my

RE: IEC 1000-X-X vs EN 61000-X-X

The IEC is simply renumbering the 1-x-X series to become the 61000-x-x series. Any new standard in that series will be numbered 61000-x-x. Existing standards are not going to be re-issued just to change the number, but when they are re-issued for whatever reason, the numbers will be changed.

RE: Shield Room Grounding

Hi Barry et al, I'm I missing something here? Is this exercise worth the trouble? If one doesn't have a clear margin to any commercial limit line with any kind of resistive dummy load attached to your LISN shouldn't you examine the your system setup? Accurate determination of your measurement syst

RE: Ozone...

All I found was the following from 1996 ... http://www.ssnewslink.com/html/governme.html At 09:44 AM 10/9/98 -0400, Matejic, Mirko wrote: >Can somebody confirm information I picked on the radio that each Shuttle >launch causes a major damage in the Ozone layer? > >Mirko Matejic - This

Re: Two diverse questions

From: Gary McInturff Subject: Two diverse questions Date: Fri, 9 Oct 1998 11:05:11 -0700 To: 'emc-pstc list server' > * TNV3 connectors are BNC types - are their connectors that can > provide higher density connections than 1? - given the nature of coax

RE: Added paragraph

Unfortunately, my Email system does not allow me to edit any Email I am replying. For example, Peter, I am not able to change anything of you message.--Barry Ma - Original Text From: "Peter Tarver" , on 10/8/98 2:57 PM: Better yet, how about the subscribers taking the addition

UL1950 vs UL508 for Switching Power Supplies

Dear PSTC Members, Assuming a manufacturer had UL1950 Third Edition Recognized Component Class I (earthed) ITE Power Supplies and they wanted to have a Listing (as an open-end device) to the Standard for Industrial Control Equipment, UL508. 1) What additional requirements must be met? I am

Capacitors Between TNV and SELV for ITE Equipment

Dear Fellow Members, Per UL1950 and EN60950: 1) Can you tell me what type of capacitors will be suitable to bridge basic insulation between TNV-3 circuits and SELV circuits? 2) Assuming that the body of above TNV-3 to SELV capacitors can touch SELV components, can the body be considered suita

(Fwd) UL1950/CSA C22.2 950 Third Edition; Telco Overvoltage Te

Forwarded message: From: Self To: pstc-...@ieee.org Subject: UL1950/CSA C22.2 950 Third Edition; Telco Overvoltage Tests List-Post: emc-pstc@listserv.ieee.org Date: Fri, 9 Oct 1998 23:50:09 +0200 Dear Fellow members, After the application of the Overvoltage Tests to telecom interfaces subj

RATED VOLTAGE UL1950

Dear group, I have a question on defining the RATED VOLTAGE that should be applied to TNV in UL1950 Clause 6.3.3.1 "Additional Test" for "separation between telecommunication network and earth" (Figure 17) for a Class III device that operates from an external nominal 12VDC (SELV) Listed Class II L