standards - water-cooled electrical devices

Hi All, Can anyone recommend standards that do a good job of addressing separation of water from electrical devices? Perhaps submersible pumps, hot tubs, or water-cooled welders? I have a product that does not fall into any of these categories but does contain water-cooled, high-voltage

voltage dip requirements

Hello Group, I just received a brand new, shiny copy of EN 61000-6-2. The voltage dip / interruption requirements are not clear to me. Table 4 quantifies dip and interruption levels as % reduction. So, when they say a 30% reduction, I assume they mean that the voltage is reduced to 70% of its

FW: Scope of EN 61000-4-11

Thank you to all who responded. I have the information I need now. Regards, Jeff Jenkins Advanced Energy Industries, Inc. Fort Collins, CO -Original Message- From: JENKINS, JEFF Sent: Saturday, February 03, 2001 11:41 AM To: emc-p...@ieee.org Subject: Scope of EN 61000-4

Scope of EN 61000-4-11

I have ordered this standard, but I could use a little help while I wait for it to arrive. I have heard rumours that it applies only to single-phase equipment that draws 16A or less. Is this true? Thanks. Jeff Jenkins Advanced Energy Industries, Inc. Fort Collins, CO

NRTL requirement in the NEC?

Hello Group, Has anyone heard of a requirement in the National Electrical Code that power supplies which are components of larger systems be approved by an NRTL? I have an inspector telling me this, but our copy of the NEC is 20 years old, and I can't find it, anyway. In this case, the power

RE: PCB fuse trace

In addition, there is a concern about where the particles of metal from the blasted trace will end up, or where the curled up trace will go. This may compromise required insulation. As Peter points out, this may be difficult to repeat twice with the same result. Regards, Jeff Jenkins

900 MHz for industrial use

Greetings, I have an internal client asking about using a 900 MHz chip set to perform communications within an industrial product. I am unfamiliar with the rules governing industrial emissions at this frequency. Our products are used worldwide. Your help is appreciated. Regards, Jeff

High frequency overcurrent protection

Hello Group, Are any of you familiar with high-frequency overcurrent protection devices that will satisfy the standards applicable to fuses and/or circuit breakers? Fuses and circuit breakers are generally rated for either DC or 50/60 Hz applications. I have an application that uses a

RE: German to English Translation

Richard, Try this website: http://dict.leo.org/ Regards, Jeff Jenkins Advanced Energy Industries, Inc. Fort Collins, CO USA -Original Message- From: wo...@sensormatic.com [mailto:wo...@sensormatic.com] Sent: Thursday, May 25, 2000 7:07 AM To: emc-p...@majordomo.ieee.org Subject: German

ISM prohibited frequencies

I have a question about ISM prohibited frequencies according to 47 CFR Part 18. Section 18.303 says that operation in the prohibited frequency bands is not allowed. My question is, what is their interpretation of the word operation? 1.) If the equipment in question uses these frequencies only

RE: Breakdown voltage between pcb layers

Hi David, We have some experience with this at my company, although not involving TNV circuits. My company produces high voltage, high frequency power conversion equipment mainly for the semiconductor manufacturing industry. We are constantly challenging the voltage withstand capabilities of

Agency approvals on components in CE mar

It is my understanding that the European Commission has stated that a manufacturer has the freedom to determine the acceptability of components used in CE marked products. (Or words to that effect.) I would conclude that this would remove the need for using European agency approved

water-cooled electrodes

I would like to know if anyone in the group has been involved with the AGENCY APPROVAL of a product containing a water-cooled live electrode or coil, and what had to be done to make this safe in the eyes of the agency. My company is occasionally involved with this sort of thing, and some feel that

RE: Varistors to ground

This information is very timely since I am currently working on a project that requires varistors to ground. The varistors are not approved. How does one size the spark gap firing voltage and the fuse value? I am concerned with the fuse opening when the equipment sees a transient. Also, if the

low-watt transformer fusing

Hi folks, I have a question about transformer fusing. I have an application that uses a 10W transformer connected across 400Vac mains. It is my understanding that this requires a fuse rated to at least 400V, which would mean 500V because that's the next larger size available. However, the

Searching for an accredited IEC65 test l

I am looking for an accredited test laboratory that is capable of performing the component tests called out in IEC 65:1985, sections 14.1 and 14.2. (Which cover resistors and capacitors.) Thank you, Jeff Jenkins Senior Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO.

Analysis of airborne contaminants

Hello, I am trying to quantify the pollution degree at one of our installations. It is an industrial environment and it is suspected that there is some quantity of airborne conductive contaminants. Does anyone know if there is a device or a process that would be useful in determining the amount

RE: UL1950/EN 60 950 Spacings

Peter, We have the same situation with my company's products. We use the nominal line to neutral voltage even when no neutral is present. Our experience has been that the certifying agencies accept this. Best Regards, Jeff Jenkins Senior Regulatory Compliance Engineer Advanced Energy

FCC 47 CFR Part 18

Does anyone know if there are laws that require semiconductor processing equipment and other types of industrial equipment to conform to FCC 47 CFR Part 18? From time to time we get inquiries about this and we're wondering what is behind it. Thanks, Jeff Jenkins Advanced Energy Industries,

NEMA 4 cabinet questions

Some questions about using a NEMA 4 cabinet: (1) Is the environment inside the cabinet considered pollution degree 1, no matter what the external environment is? (2) We need to install a water drain at the bottom of the cabinet. Can we use a positive-acting valve without violating the

EN 61010-1 vs. UL 3101-1

Hello Group, Does anyone know the differences between EN 61010-1 and UL 3101-1? Thanks, Jeff Jenkins Advanced Energy Industries, Inc. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line:

RE: Excessive smoke

John, is the smoke measured in a room of a specified volume? That is to say, how is compliance with the 28% Oxygen Rating Index determined? Jeff -Original Message- From: John Juhasz [mailto:jjuh...@fiberoptions.com] Sent: Thursday, April 22, 1999 6:38 AM To: 'Rich Nute';

RE: EN 50178 clause 5.2.13

Start from the lowest limit in Table 1 and work up.   From your example #1:   30/60 = 1; 35/(1.17*60) = 1; both conditions true, therefore Um 60.   From your example #2:   200/120 = 1; NOT true, therefore go to next limit in Table 1;   200/2000 = 1; 205/(1.17*2000) = 1; both conditions true,

Excessive smoke

I'm full of questions this week. Here's today's. If a component abnormal test generates excessive and sustained smoke (several minutes), but does'nt breach reinforced or double insulation, nor emit flame from the enclosure, is it considered a failure? Intuitively, it seems like it would be,

Conductive Paint, Round 2

I need to clarify my earlier question on conductive paint. We bond our enclosure panels together with screws. We use external-tooth starwashers between the screws and sheet metal to achieve a reliable, protective-earth bond. On our painted panels, we mask the paint so that the starwasher makes

Conductive Paint

Hello Group, My company is proposing to use conductive paint on our enclosures, and I would like your input as to the acceptability of this vis-a-vis protective earth bonding of enclosure panels. I am interested in the perspective of both European and North American requirements. This should be

IEC 950 and pulsed outputs

Hello Group, I have some questions about determination of working voltage for IEC 950. I have a high voltage pulsed output. My questions are: 1. Can I calculate an average or rms value based on the duty cycle of the pulse, and use this as my working voltage? I am aware of Table 4, but this

FW: Thermocouple alternative?

-Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Monday, January 07, 2002 9:20 AM To: Crabb, John; emc-p...@majordomo.ieee.org Subject: Re: Thermocouple alternative? John, We use T-type thermocouples which are not as ferrous as J and K types, and