Re: Define Continuous DC Voltage

Hi Dan: > Does anyone know what voltage is used in electric chairs? Just Curious. I'm sorry you asked. The electric chair is one of the more barbarous methods of execution. The voltage is a function of time, and varies with the execution authority. The voltage is in the range of 1000-2

Re: Define Continuous DC Voltage

Whoops!!! I was thinking wheel chair and on second thought I realized what you were thinking of was a means of intentional electrocution and execution. My mistake! -- >From: "Dan Kinney (A)" >To: Rich Nute , gkerv...@eu-link.com >Cc: jrbar...@lexmark.com, emc-p...@majordomo.ieee.org >Su

Re: Define Continuous DC Voltage

I know of at least one that runs off a 12 Volt battery. I think it is a gel-cell but I KNOW it charges off an ordinary 12 Volt charger and it is supposed to be trickled charged nightly, so it is like a lead-acid in that it likes to be constantly charged and doesn't have "memory." -- >F

RE: ULC vs. CUL

Perhaps they can reply if they are monitoring this forum, but I'll give it a shot... ULC is Underwriters Laboratories of Canada, and while they do product approvals, they generally in the past have not done the sort of product safety work that UL does. ULC has focussed more on building products

Wiring - Single faults

As a military radar systems engineer I deal with various safety issues associated with aircraft radar systems. However, I have recently been looking at the safety of some associated benign environment test equipment comprising (at least in the context of safety) various simple 230v standard mai

Re: ULC vs. CUL

ULC is Underwriters Laboratories of Canada CUL is a Listing or classification mark from Underwriters Laboratories Inc. Note: I have only seen ULC come up in approvals of FIre Detection and Suppression Equipment. e.g. Fire Extinguishers etc. bur...@andovercontrols.com on 11/13/2001 03:18:12

RE: 80/80 rule for euro compliance?

Chris, David, I just checked CISPR 22:1997 and this shows up in Section 7.1.2, they go into quite a bit of detail. Regards, Lou Guerin Littlefeet, Inc. www.littlefeet-inc.com -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Tuesday, November 13, 2001

AC, DC definitions and safety

my two cents worth About electric shock: I'm finding it hard to reconcile some of what I'm reading here with real world experience of electric shock, not saying anyone's wrong, just that evidence is open to interpretation. In particular the statement "Dc does not cause either tetanus or fibr

Re: CISPR 11 and CISPR 22

I read in !emc-pstc that Kim Boll Jensen wrote (in <3bf0ed95.d6886...@post7.tele.dk>) about 'CISPR 11 and CISPR 22', on Tue, 13 Nov 2001: >Could somebody please send me the basic requirements for CISPR 11 >emission limits I need to compare with CISPR 22 for a non radio product >under EN60601-2.

Re: AW: Define Continuous DC Voltage

I read in !emc-pstc that Rich Nute wrote (in <20031830.kaa06...@epgc196.sdd.hp.com>) about 'AW: Define Continuous DC Voltage', on Tue, 13 Nov 2001: > > > > >Hi John: > > >> I have never been very keen on the concept of SELV, and I am glad to see >> that others are now recognizing the prob

Re: Define Continuous DC Voltage

I read in !emc-pstc that Rich Nute wrote (in <20031730.jaa05...@epgc196.sdd.hp.com>) about 'Define Continuous DC Voltage', on Tue, 13 Nov 2001: >Dc does not cause either tetanus or fibrillation. Tetanus is a disease caused by a bacillus. Muscles spasm is tetany. -- Regards, John Woodgate,

RE: Define Continuous DC Voltage

Does anyone know what voltage is used in electric chairs? Just Curious. Dan Kinney Horner APG Indianapolis > -Original Message- > From: Rich Nute [SMTP:ri...@sdd.hp.com] > Sent: Tuesday, November 13, 2001 2:08 PM > To: gkerv...@eu-link.com > Cc: jrbar...@lexmark.com; emc-p...@majordo

RE: ULC vs. CUL

Joe, The ULC mark is describe at the following link. http://www.ulc.ca/marks.asp John Juhasz Fiber Options Bohemia, NY -Original Message- From: bur...@andovercontrols.com [mailto:bur...@andovercontrols.com] Sent: Tuesday, November 13, 2001 3:18 PM To: emc

RE: ULC vs. CUL

Joe, Some info on the various marks is available at: http://www.ul.com/mark/index.html http://www.ulc.ca/marks.asp Regards, Kaz Gawrzyjal Dell Computer Corp. -Original Message- From: bur...@andovercontrols.com [mailto:bur...@andovercontrols.com] Sent: Tuesday, November 13, 2001 2:18 PM

Re: [Fwd: User Warning Signal Words]

Hi John: > >I feel the authors of these definitions neither consulted > >a dictionary nor the users of warnings. > > I'm sure that you are right, but what is the alternative to using > existing words but with special definitions that make their meanings > more precise? If you so

Re: ULC vs. CUL

There is a UL mark acceptable for the U.S. There was a c-UL mark, acceptable to both Canada and the U.S. The more correct mark from UL for the c-UL mark is now the c-UL-us mark, i.e. circled UL with small c outside lower left of circle and small us outside lower right of circle. I have never he

Re: [Fwd: User Warning Signal Words]

I read in !emc-pstc that Rich Nute wrote (in <20030122.raa03...@epgc196.sdd.hp.com>) about '[Fwd: User Warning Signal Words]', on Mon, 12 Nov 2001: >I feel the authors of these definitions neither consulted >a dictionary nor the users of warnings. I'm sure that you are right, but what is

Re: 80/80 rule for euro compliance?

I read in !emc-pstc that Dan Irish - Sun BOS Hardware wrote (in <2000.RAA05232@st- ides.East.Sun.COM>) about '80/80 rule for euro compliance?', on Mon, 12 Nov 2001: >As I recall, this used to be in CISPR16 "...Radio Interference Measuring >Apparatus and Methods," section 9. >In later vers

Re: 80/80 rule for euro compliance?

I read in !emc-pstc that David Heald wrote (in <3bf037f8.c93b8...@mediaone.net>) about '80/80 rule for euro compliance?', on Mon, 12 Nov 2001: > I remember hearing somewhere (& it seems that I found the answer >somewhere but I can't remember) that there is a stipulation for European >compliance t

Re: "Safety Critical" etc - the future

I read in !emc-pstc that Rich Nute wrote (in <20022339.paa03...@epgc196.sdd.hp.com>) about '"Safety Critical" etc - the future', on Mon, 12 Nov 2001: >> A supply transformer of a not grounded SELV is a safety critical component. >> A supply transformer of a grounded SELV is a safety relat

Re: CLASS 11(DOUBLE INSULATED) & 2/3-CORE CABLE

I read in !emc-pstc that Rich Nute wrote (in <20022357.paa03...@epgc196.sdd.hp.com>) about 'CLASS 11(DOUBLE INSULATED) & 2/3-CORE CABLE', on Mon, 12 Nov 2001: > > > >Hi John: > > >> No; France and Norway have 'IT' systems, in which grounding is only to >> prevent static charge build-up; t

ULC vs. CUL

Someone from our UK office is asking if ULC is the same as CUL. Does anyone know the difference between these two marks? Your help is always appreciated. Thanks, Joe Josiah P. Burch Compliance Engineer II Andover Controls Corporation 300 Brickstone Square Andover,Ma 01810 (978)-470-0555 x335 (

Re: Define Continuous DC Voltage

Hi Gregg: > There was also a very good (but short) article by Tektronix in the 70's > called The Lethal Current. > > It concluded that currents between 100 mA and 3 Amps were more lethal that > currents of more than 3 Amps because those high currents tended to 'restart' > the hea

Re: RF Immunity Testing to 50V

Hi Kevin, we too can achieve high fields, currently about 80 v/m is our limit. Again, you may want to talk more offline Best regards, Derek. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list.

Re: AW: Define Continuous DC Voltage

Hi John: > I have never been very keen on the concept of SELV, and I am glad to see > that others are now recognizing the problems. Interesting statement. In contrast, I don't see how we can get along without SELV. My concept for SELV is that of ELV so protected from a higher voltage

Re: Define Continuous DC Voltage

Hi Chris: I'll attempt to answer the question as to the effect of ac and dc current on the body (the "hazard"). The discussion is in regard to three waveforms: 1) ac sinusoidal -- 50-60 Hz. 2) dc 3) dc interrupted (equal on and off times) up to 200 Hz. Each has a different e

RE: HiPot testing of DC mains powered products

Rich - While I can't speak for Chris, there are a few reasons to perform production line ESTs on 48V dc mains powered equipment. 1) in 48Vdc SMPSs, the voltages present on transformer insulation are typically in excess of ELV limits. If the power supply has had fault testing performed that clea

RE: HiPot testing of DC mains powered products

I agree with Rich. Appendix D of your UL report or procedure has Exceptions to the standard dielectric and ground continuity tests done by the manufacturer. In my case I have 4 products which do not require either of these tests. I'd take a quick glance in your procedure. Gary -Origin

RE: Define Continuous DC Voltage

There was also a very good (but short) article by Tektronix in the 70's called The Lethal Current. It concluded that currents between 100 mA and 3 Amps were more lethal that currents of more than 3 Amps because those high currents tended to 'restart' the heart. I think I will try not the check

Laser products for Japan

Hi all Does anyone know of requirements in Japan for a Class 3b laser product: electrical safety EMC laser safety Best regards, Kim Boll Jensen Bolls Raadgivning <>

RE: 80/80 rule for euro compliance?

I have seen this in Section 6 of EN 55011:1990 Section 8 of EN 55022:1995 I'm not sure if there are any plans to remove these references from newer versions of these standards. Best regards, Chris > -Original Message- > From: David Heald [SMTP:davehe...@mediaone.net] > Sent: Monday,

CISPR 11 and CISPR 22

Hi all Could somebody please send me the basic requirements for CISPR 11 emission limits I need to compare with CISPR 22 for a non radio product under EN60601-2. Best regards, Kim Boll Jensen Bolls Raadgivning Consultancy in world wide approvals <>

Re: Radio Module, full product re-test?

Hi Alex If you integrate the new radio module without change anything on the radio module I suggest to make no test on the product. Ciao Paolo At 13:36 11/12/01 +, Alex McNeil wrote: Hi Group, Situation I have an alternate Small Radio Device (SRD) Module, previous one obsoleted, in a prod

Re: Group:

I read in !emc-pstc that Donald McElheran wrote (in <808E4747B94FD511BDB0005004A1DE7F0521E3@HQ-EXCHANGE>) about 'Group:', on Mon, 12 Nov 2001: >The product being supplied via an external low voltage ( <20V DC @ 6A ) Do you mean 'less than 20 V'? The symbols < and > are often confused. >appears

Re: [Fwd: User Warning Signal Words]

> According to ANSI Z35.4 the following definitions are provided: > > > > DANGER - Indicates an imminently hazardous situation which, if not > avoided will result in death or serious injury. This signal word is to > be limited to the most extreme situations. > > WARNING -

Re: HiPot testing of DC mains powered products

Hi Chris: I wonder why you need to hi-pot test a SELV-powered product? (I presume your external 48-volt dc source is SELV.) We make products intended for connection to an external dc source (SELV). We have never been required to perform a hi-pot test on such products. The production-line

RE: RF Immunity Testing to 50V

>-Original Message- >From: Kevin Harris [mailto:harr...@dscltd.com] >Sent: Monday, November 12, 2001 9:18 AM >To: EMC-PSTC (E-mail) >Subject: RF Immunity Testing to 50V > > > >Hello Group, > >Does anybody know of a test lab being able to test small >objects (less than >15cm in any axis

RE: 80/80 rule for euro compliance?

It is implied by the statistical analysis of a sample population during formal conformity assessment. Reference EN 55022:1998 Clause 7 (7.2.3) Regards, JOHN E. STUCKEY EMC Engineer NCT EMC 002047 Micron Technology, Inc. Quality and Reliability Assurance EMC Group M/S 941 3176 S. Denver Way Boi

Re: CLASS 11(DOUBLE INSULATED) & 2/3-CORE CABLE

Hi John: > No; France and Norway have 'IT' systems, in which grounding is only to > prevent static charge build-up; the neutral is grounded through an > impedance at the sub-station. AIUI, this is used in mountainous > districts where ground paths are long and of low conductivity. The