Re Richard's item 5)... > 5. UL requires that all internal equipment be UL Listed or > Recognized. > If that is true, then the value of the CSA/NRTL mark, and conversely the cUL mark if CSA plays this way too, is highly questionable. Do you have a direct-from-UL interpretation saying that they are not accepting the CSA/NRTL mark? If so, I would expect CSA to take action to defend its mark, and UL to have no firm ground to stand on!
Comments? Jim Eichner Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. > -----Original Message----- > From: WOODS, RICHARD [SMTP:wo...@sensormatic.com] > Sent: Tuesday, March 09, 1999 11:15 AM > To: emc-p...@majordomo.ieee.org; t...@world.std.com > Subject: RE: Rack System Safety (UL1950/EN 60950) Questions > > 1. Peter, equipment with the standard NEMA plug is considered to be > Class A.. > 2. Equipment using the heavy duty Industrial plugs complying with > IEC > are considered to be Class B. I have never seen those used inside rack > mounted equipment. > 3. If the power supply is UL "Listed", then temperature > measurements > are not required. However, most power supplies are categorized as > "Recognized" and are therefore incomplete in construction - that is, > they > cannot pass the safety requirements for a stand alone power supply. > Temperature measurements will be required. > 4. Stability is performed in a worst case situation, but reason is > also > taken into account. Most likely, you will determine that it is > possible and > reasonable to assume that more than one assembly can be extending at > the > same time. > 5. UL requires that all internal equipment be UL Listed or > Recognized. > > --- > From: pe...@itl.co.il [SMTP:pe...@itl.co.il] > Sent: Tuesday, March 09, 1999 11:26 AM > To: emc-p...@majordomo.ieee.org; t...@world.std.com > Subject: Rack System Safety (UL1950/EN 60950) Questions > > Dear All, > > I would like to know some of your professional advice on some > issues reagrding rack systems to be evaluated to UL1950/EN 60 > 950. > > 1. For the North America, does a NEMA 125 V, 20 A plug meet the > pluggable B definition? > > 2. What are some plug configurations which will meet the > pluggable B equipment requirements for North America and > Europe? > > 3. Does anyone have experience with UL and/or CSA and/or TUV > when testing a unit employing a Recognized/Certified/Approved > computer type "totally enclosed" power supply? I am interested > to > know if temperatures should be monitored within such a power > supply. So far, I have been asked to thermocouple various points > > within the power supply and as you all know, it could get very > crowded in there. I am interested to know if someone out there > knows if such a waiver exists for totally enclosed Approved > power > supplies. > > 4. When conducting stability tests for rack systems, should all > the > serviceable card cages be extended out or is it enough to do it > one > at a time. > > 5. For a CSA NRTLC unit employed in the rack system, does > anyone know if the CSA NRTLC Mark is automatically accepted by > UL or does UL require that the unit must be re-investigated and > placed under their Follow-Up Program? > > 6. Has the US Robotics Listed "Sporster" card modem been > evaluated to UL1950 Third Edition? > > 7. Can I List/Certify a rack system to UL1950 Third Edition if > the > units within it have been Listed/Certified to UL1950 First > and/or > Second Editions? I do not think so, but am interested to hear > your > opinions. > > 8. How is a CB test report done for a rack system which consists > > of previously Listed/Certified/Approved units? Does the CB > scheme > Recognize the Approvals of the various test agencies > (UL/CSA/TUV)? > > Thanks in advance. > > > PETER S. MERGUERIAN > MANAGING DIRECTOR > PRODUCT TESTING DIVISION > I.T.L. (PRODUCT TESTING) LTD. > HACHAROSHET 26, P.O.B. 211 > OR YEHUDA 60251, ISRAEL > > TEL: 972-3-5339022 > FAX: 972-3-5339019 > E-MAIL: pe...@itl.co.il > Visit our Website: http://www.itl.co.il > > --------- > 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...@cubic.com, > j...@gwmail.monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > --------- > 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...@cubic.com, > j...@gwmail.monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). --------- 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...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
