RE: ventilation holes

George - Please keep in mind that SELV alone, while addressing electric shock, does not address risks of fire. If, however, the external power supply complies with the requirements of a Limited Power Source, then you're home free, in terms of complying with the safety standard(s) (the enclosure

Looking for reliable Scope repair

I hate to impose on the group but - - Can anyone recommend someone (in USA) to repair a minor sweep / trigger problem in my personal 465 Tektronix scope. It's an old friend and I can't afford a new one. A local company want's $200 Evaluation fee just to put it on the bench. I would appreciate

Re: ventilation holes

Hi David: You probably already know this, but don't forget that the product will need to pass temp tests during abnormals i.e., blocked vents. I'm not sure if pass temp tests means compliance with the heating requirements or the abnormal requirements, so I offer this clarification.

Re: UL Material flammability requirements for enclosures less than .3

Hi Paul: Can anyone give me any information on whether a box with less than .33 cubic feet needs to meet UL Flammability ratings? I have been told this is true, but I can not find the location of that information. I believe the requirement you are referring to is Sub-clause

Re: ventilation holes

You probably already know this, but don't forget that the product will need to pass temp tests during abnormals i.e., blocked vents. Regards, David Lohbeck --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc

Re: In Line Fuseholder

Hi Bill Both Littelfuse and Wickmann Werke have these fuses Good Luck Kim Boll Jensen Bolls Raadgivning, Denmark Bill Wilson skriver: HELP!!! I'm looking for a UL R/C, 250V in line fuseholder for 5X20mm /or .25X1.25 fuses. There are a lot of 32Volters out there, but not 250V. Any

UL Material flammability requirements for enclosures less than .3 3 cubic feet.

Can anyone give me any information on whether a box with less than .33 cubic feet needs to meet UL Flammability ratings? I have been told this is true, but I can not find the location of that information. If possible can you give the exact UL specification this information can be found? I have

Re: ventilation holes

Hi George: I have a safety question for the group. I have a small (about 8 x 10 x 2 inch) piece of ITE equipment, SELV, enclosed in a plastic case, powered by an external 12 volt brick from AC mains. The problem is, the device tends to run a little hotter than desired.

Standards Listing

Thanks to all who responded John Richards Customer Assurance Engineer Eurotherm Drives Limited --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at:

ventilation holes

Hi Folks, I have a safety question for the group. I have a small (about 8 x 10 x 2 inch) piece of ITE equipment, SELV, enclosed in a plastic case, powered by an external 12 volt brick from AC mains. The problem is, the device tends to run a little hotter than desired. One proposed

RE: Use of PCB Traces as Fuse and Voltage suppressor

I can't verify the part that after a wrench was dropped on the -48V bus bars, all the other equipment was blown, but I can throw a little light on this. The previous company I worked for made Telco rectifiers. Our largest system had an output of over half a megawatt (!) at -48V. The bus bars were

Seeking Requirements for Electric Wheelchair/ATV ??

Hello All, Are there any US and/or Canadian electrical safety requirements (beyond battery charger concerns) for electric vehicles -in this case - a vehicle that's cross between an electric wheelchair and an ATV (off-road, all terrain vehicle) Also interested in any other regulatory

Automotive EMC

Try the following: http://europa.eu.int/eur-lex/en/lif/dat/1995/en_395L0054.html http://www.vca.gov.uk http://www.mira.co.uk/certification/ Regards Keith --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc

RE: ESD Generator confidence test - Pelligrini Target

Just one comment on the Pelligrini Target: We compared different Pelligrini Targets that were all made to the specifications. - Up to 1 GHz they perform reasonably close - Above 1 GHz large differences show up, although they are all made to the drawings. - All of them show resonances in

Re:RE: ESD Generator confidence test

We also have come up with a simple way to test our ESD gun, but it requires the help from our lab assistant (lab managers work good too). First, have them take off their shoes and socks and stand on the Ground Reference Plan. Have them wet their fingers and grab the end of the ESD gun. Crank

In Line Fuseholder

HELP!!! I'm looking for a UL R/C, 250V in line fuseholder for 5X20mm /or .25X1.25 fuses. There are a lot of 32Volters out there, but not 250V. Any assistance will be greatly appreciated. Bill Bill Wilson W.W.Wilson Associates 508-651-1388 wwwil...@rcn.com www.wwwilsonassoc.com

RE: Vehicle EMC and Safety standards

Hi Alex, The EMC standards governing vehicle electrical sub-assemblies (ESAs) are as follows: 1 - Radiated emissions - 95/54/EC (automotive directive) and CISPR 25 2 - Conducted emissions - CISPR 25 ( omitted by directive ) 3 - ESD is governed by ISO 10605. The test levels are 15kV air

Looking for a plug-in module for CDi1000

Hi good people, Would any of you guys out there happen to 'own' a 2x10uS module for the Compliance Design surge generator? I realize it is time to get away from this solution but we need a fast and hopefully inexpensive replacement immediately. Please respond to email below if you can help.

RE: Vehicle EMC and Safety standards

Alex, For Europe, you need to check the Automotive EMC Directive 95/54/EC. It provides the EMC approval regime for motor vehicles of 4 wheels or more and all equipment (including aftermarket equipment) intended to be fitted in the vehicle. This e-mail message may contain privileged or

RE: Vehicle EMC and Safety standards

Hi Alex, I thought that I was done looking through EMC-PSTC stuff this morning. But something popped into my head when I read your question. We made a cigarette lighter adapter for one of our products. At the time I had to look up the Automotive EMC Directive 95/54/EC. There was a website at

RE: ESD Generator confidence test

Hi guys, Being that EMC is a side job for me. I have not been able to build an official ESD target. We calibrate our EMC test equipment (which includes an ESD gun and a multifunction transient generator EFT, Surge...) on a yearly basis. Between calibrations, I have some relatively simple

Re: Standards listing

http://europa.eu.int/comm/enterprise/newapproach/standardization/harms tds/reflist/emc.html is what you are looking for, I think. Regards Nick. At 08:34 + 26/2/2002, Richards, John wrote: Can someone please point me to a database/listing of European EMC standards? Thanks John

Vehicle EMC and Safety standards

Hi Group, Our financial transaction terminals are mostly used in the commercial area e.g. shops and offices, which use a separate AC/DC power supply block connected to the mains There is a requirement for these same products to be used in vehicles e.g. Taxis and Buses. These would use the power

Standards listing

Can someone please point me to a database/listing of European EMC standards? Thanks John Richards Customer Assurance Engineer Eurotherm Drives Limited --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion

Re: Use of PCB Traces as Fuse and Voltage suppressor

Jim, You touch on an important issue concerning a fuse - just how does it blow? Years ago I discovered by accident that fuses were designed with some remarkable properties, when we had to make our own transient generator to verify some telcom equipment's compliance to a BABT power supply

RE: PCB floating area layout

My comments were more related to the situation of a floating ground that was not well grounded to the main ground. It seems to me that you may have a common mode noise problem. Noise is probably being coupled to the ground plane and using the shield on the DC cable as an antenna. Looping the

RE: PCB floating area layout

Jeeez, I have just the opposite problem GROUNDING a PCB at a certain location. The device is a metal enclosed digital device, about the size of a video cassett tape. Its powered by one of those small AC/DC power supplies like you have on your laptop computer. The DC

RE: PCB floating area layout

One of the major causes of emissions can be excessive loop areas caused by a long return path for signal currents due to the division of the ground plane. Review the ground return path for signal lines that bridge the gaps. Ideally, the signal return path on the ground plane should be directly