2 Phases in North America

Hi All, Can someone provide an estimate of the percentage of homes and businesses that have 2 phases in Canada and the USA? Also, what is the most common voltage between phases? Thanks and regards Barry Esmore AUS-TICK 281 Lawrence Rd Mt Waverley Vic 3149 Australia Ph: + 61 3 9886 1345 Fax:

RE: Enclosed OATS facilities---detour

I have the 'dome' (well, my employer does). Actually, it is an 8 meter dia. radome, white fiberglass throughout. With door, HVAC and rotating floor that serves as ground plane. We pipe in fibre optics for PC host to EUT control from a receiver shelter located 50 meters perpendicular to the

Re: Video averaging

Averaging by convention means an arithmetic average and that by definition means taking all the elements of a set, adding their values together and dividing by the number of elements. That works fine in linear space. If you try that in log space, you get a geometric rather than an arithmetic

Re: Motor Noise

Not enough info for me to weigh in with any kind of certainty. I do know from personal experience that if you use solid state switches to control motor operation by applying a pulse train (PWM) rather than continuous voltage control that will generate big spikes as the inductance of the motor

RE: Components to suppress fast transient / bursts

I suggest you apply self-induction with low parallel capacity such as ferrites before any clamping device. Standard varistors do perform self induction in series with the clamping part. The source impedance of the EFT pulse is 50 Ohm. If your low impedance path to ground is 1 Ohm inductive still

RE: CFR 21 Sec. 11

Thank You everyone!! I found quite a bit of information on this subject and it was determined that our products are compliant. This is more of a OS and System Administrator file and network security issue than hardware integrity. I think I caused a completion on the sale of 1.5 TB of disk

Re: Safety interlock

Kim, The 'safest' and sure-proof way of finding out a bona fide safety interlock switch is to ask the manufacturer to provide you with their agency safety test report. If the agency is UL, make sure you ask for the Conditions of Acceptability as well, where UL might place restrictions on use

RE: Safety interlock

Kim I doubt that the L has anything to do with the 100,000 cycles. You will have to either check the Conditions of acceptability for the switch (or ask you UL engineer he may be able to look it up pretty quickly). Sometimes you can tell directly from the UL online database. Check both the

RE: CFR 21 Sec. 11

Kyle, All of the CFRs are available for free on the web from the U.S. Government. Just go to www.access.gpo.gov/nara/cfr http://www.access.gpo.gov/nara/cfr and you can do a search on CFR 21 and the full text will then be available. Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567

RTTE Directive

I previously used a Notified Body in the conformity process to the RTTE Directive since only a draft radio standard existed at the time. However, a harmonized standard now exists. I understand that I have two choices: 1) Continue to use the existing Declaration of Conformity to the essential

Re: Components to suppress fast transient / bursts

I've had good results using ferrite cores. They help radiated emissions as well. P.S.: I was surprised to see your location. I'll be coming to your city for the first time on Saturday. This visit caused me to ask the question concerning snow on OATS sites. On Wed, 12 Dec 2001 21:50:35 +0100,

CFR 21 Sec. 11

Could someone explain to me or point in the right direction for what CFR 21 Section 11 requirements in a product (such as a disk storage system) for it to be compliant. I think this is about records and electronic signature authentication and has something to do with the FDA (CPG 7153.17). It

internal modem

Thanks to the group for the great information. All the responses drew my focus to two primary standards; UL60950 and TIA/EIA/IS-968. After I have had a chance to obtain and review them and to take some of the other suggestions into consideration, I may have additional and more specific

Motor Noise

From: Cecil A. Gittens All .. specifically Senior EMC Team Members. I am having a problem on the power control board, in the motor control ckt. when we turn the motors on. This condition creates significant noise spike on my entire ground plane, along with the other power ckts, this

RE: Enclosed OATS facilities in snow country

We plow the snow away from around the building. Unfortunately the building is up on a small rise but it does make it easy to get the snow line below the ground plane. Jim -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of

RE: internal modem

Keep in mind that UL1459 is obsolete. The overvoltage testing is now covered in UL60950. Regards, Alex McKinney Safety Engineer LXE, Inc. Tel: 770-447-4224 x3606 Fax: 770-447-6928 -Original Message- From: David Spencer [mailto:dspen...@oresis.com] Sent: Wednesday, December 12, 2001

RE: Australian Regulations Revision

To clarify John's comment, this is only in relation to EMC regulation. Many changes have been implemented - in NZ on 12 Oct 2001 and in Australia on 7 Dec 2001. Some of these changes include: - a fundamental change to close a loop-hole which excluded any equipment being hired/leased; - the

RE: Old Australian Safety Standard

Tony, Sorry not to have replied before now. Have been engrossed in other things and not able to respond to newsgroup mail for about 2 weeks. Not sure of the actual number of the Australian standard at the time however it was based on IEC 435 for data processing equipment and IEC 380 for office

RE: Components to suppress fast transient / bursts

Hi Amund, A properly sized varistor ( sometimes with capacitor in parallel) is quite effective. You will find IEC 1000-4-4 mentioned in some varistor datasheets. Just mind that you have the energy rating correctly specified and for really high speed response, opt for surface mount. The

AW: ISO 1043-1 to 1043-4

Look at http://www.iso.ch/iso/en/stdsdevelopment/tc/tclist/TechnicalCommitteeStandar dsListPage.TechnicalCommitteeStandardsList?COMMID=1993 -Ursprüngliche Nachricht- Von: Boonstra, Tim [mailto:tboons...@4benchmark.com] Gesendet: Mittwoch, 12. Dezember 2001 17:24 An: Major Domo (E-mail)

Video averaging

Hi all Someone told me that when doing the video averaging(set it small, say 10Hz), you need to use linear scale(uV) instead of log scale(dBuV). What is the reason behind about this? Best Regards KC Chan --- This message is from the IEEE EMC Society

Re: Sometimes product safety just isn't enough

Now we should understand why some agencies have these crazy instructions that overstate the obvious-- do not use while in the bathtub taniagr...@msn.com - Original Message - From: Robert Johnson Sent: Wednesday, December 12, 2001 11:11 AM To: emc-p...@majordomo.ieee.org