Re: [PSES] IEC 61010-1 and VDRs in OVC III environments

> FWIW, have recorded >4kV transients at a North Carolina > site twice during previous 14 months. Unfortunately, we don't know whether the cause was by operation of equipment, operation of a transient suppression device, or atmospheric discharge. Since the occurrence rate is so low, and the

Re: [PSES] IEC 61010-1 and VDRs in OVC III environments

Would think that the normative reference would be IEC61051-2 for IEC/EN61010-1 report and requirements. UL1449 only referenced in UL61010-1. Cannot remember specifics, but SPD classifications not exactly same. SPD type can be determined by national differences, where used in equipment panels,

Re: [PSES] Reliable means to attach thermocouple to object

However, it is easier to just measure it than argue with the NRTL, which must follow what the standard says, which all too often include semiconductors and capacitors. Some of the tables in standards like UL458 haven't been updated for a long time. (when was the last time you saw a selenium

Re: [PSES] IEC 61010-1 and VDRs in OVC III environments

Hi Peter: Don't use the VDR or any transient suppression. Take it out. Your insulation is good enough and is not likely to be damaged by a transient over-voltage. VDRs and most other transient suppression schemes may protect the immediate equipment, but generate transients for other

[PSES] IEC 61010-1 and VDRs in OVC III environments

Howdy, howdy, howdy. Product incorporates Type 5 component VDRs and is installed in an OVC III environment via field wiring connections. Evaluation for a CB Scheme Certificate and Test Report. In recent dealings with a CBTL, I was told that the VDRs in a product needed to be Type 2. In

Re: [PSES] Insulation testing

Hi John: How do you demonstrate the dielectric strength between mains and user accessible circuits when the accessible circuits are referenced to chassis? Disconnect the ground, and connect the low end of the hi-pot tester to the user-accessible part (circuit). Don't touch the

Re: [PSES] Reliable means to attach thermocouple to object

We use a small drop of gap-filling cyanoacrylate (like Krazy Glue) to affix thermocouples. With strain relief (taping) they stay put up to 160C in our experience. That glue type is nice because it is easy to see bead contact with the surface. . Ralph McDiarmid Compliance Engineering

Re: [PSES] In-situ testing of Machines for CE Mark

Jim, In-situ testing is the norm for these kinds of machines in my experience. Depending on whether the machine is fully assembled at the manufacturer or not determines where the testing is done. If the machine can qualify as a “fixed installation” under the EMC Directive (Art. 13), testing

[PSES] In-situ testing of Machines for CE Mark

Fellow Compliance Professionals, I understand that equipment must be CE marked and comply with all applicable Directives before being placed into service within the EU. However, custom one-of-a-kind machines can be a challenge. Are there any provisions within the EU Directives (Machinery &

Re: [PSES] Reliable means to attach thermocouple to object

Remember the question. the tape I am using doesn't work at 120 degrees. Now we have specific IECEE specifications on thermal couple terminals in accordance to NRTL standards controlling temperatures on specific component bodies. all this.. and just maybe someone is measuring the end of

Re: [PSES] Reliable means to attach thermocouple to object

Brian brings up a good point. Where is the best place to put the thermocouple. If the location is critical, we use two methods; one is a touchless thermometer. These are cheap. Less than $25 at most places like Harbor Freight. You are only looking for the hot spots. Method #2 is we go borrow

Re: [PSES] Reliable means to attach thermocouple to object

> " ...operating at a temperature of 120 degC..." has no > meaning. Test conditions and component ID? A Tj of > 150deg does not mean that you are allowed 150deg on the > component body. TI, ST, and others have published some > good stuff on calculating component temps for power > semiconductors.

Re: [PSES] Reliable means to attach thermocouple to object

As a young and naïve student I once used hot melt glue. There's a clue in the name kids! James -Original Message- From: Scott Xe [mailto:scott...@gmail.com] Sent: 26 February 2016 16:53 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Reliable means to attach thermocouple to object I

Re: [PSES] Reliable means to attach thermocouple to object

Take a look at these, taken from UL Data Acceptance Program Tools and IECEE Guides: http://ul.com/wp-content/uploads/2014/12/00-OP-C0037.pdf http://www.iecee.org/Operational_documents/iecee_documents/od-5012_ed.1.0.pdf ​Daniele​ Conforti 2016-02-26 18:12 GMT+01:00 Kunde, Brian

Re: [PSES] Reliable means to attach thermocouple to object

Hi Scott; You may not be required to use it, but the IECEE's Operational Document 5012 (the previous document, OP-108 was superseded by OD-5012 last year) describes methods for preparing, attaching, extending, and using thermocouples. Sections 8.4 through 8.6 cover the attachment of

Re: [PSES] Reliable means to attach thermocouple to object

Hi Scott, All, The tape tends to ensure that stresses on the thermocouple length won't lift the tip, working as a strain relief. We typically use a high-temperature fibreglass tape, with rubber thermosetting adhesive. Once it bonds, it doesn't soften again under warm temperature. For the tip,

Re: [PSES] Reliable means to attach thermocouple to object

UL and CSA have published specific procedures and material recommendations for T/C use in Type Tests. Most NRTLs have some type of CIP program where a sample power supply is sent to a company lab to verify test technique via TRF data veracity. So the moral of the story is to use whatever

Re: [PSES] Reliable means to attach thermocouple to object

Generally agree, but be careful with using a spray-type application for the accelerant. Prefer to use an eye dropper. Had a tech, while doing tests for UL5085-3, that caught a small linear transformer on fire because the (very volatile) accelerant had not completely evaporated after spray

Re: [PSES] Reliable means to attach thermocouple to object

Scott, I have always used superglue to attach thermocouples for temperature measurements. :>) br, Pete Peter E Perkins, PE Principal Product Safety Engineer PO Box 23427 Tigard, ORe 97281-3427 503/452-1201 fone/fax p.perk...@ieee.org _ _ _ _ _ I used to

Re: [PSES] Reliable means to attach thermocouple to object

Hi Scott, Though not relevant to your product, UL 1741 has requirements on how to hold a TC in contact with the surface being measured that may be useful. Use of tape is not allowed except as strain relief only. If you are a UL customer, you should be able to access the standard. See clause 43.8.

Re: [PSES] Reliable means to attach thermocouple to object

Scott, Year ago we used Tac Pac with a spray accelerator. Just place a dab of glue where you want it, insert the thermocouple, then spray it with the accelerator and it would instantly harden. To remove, we used some kind of solvent (acetone?). Just a drop would start to soften the glue and

Re: [PSES] Reliable means to attach thermocouple to object

I have never heard of taping a thermocouple. may i suggest simple Loctite and eccelerator for quick application, a dip of thermal transfer paste would also be good for good concise measurements. Rodney Davis From: Scott Xe Sent:

[PSES] Reliable means to attach thermocouple to object

I used to attach thermocouple to the object under temperature rise test using Kapton tape. Currently I looked at an SMPS that is operating at a temperature of 120 degC under an ambient temperature of 20 degC. The tape seems not very reliable and rigid enough for long period of testing. Is