Mike, Doesn't sound that strange to me. To help answer your question I looked at several UL Follow-Up Service Procedures that we have here in the plant for various types of Information Technology Equipment. This equipment has input voltages of 100-240VAC. UL has a table in the FUS that specifies the voltages and times for Hipot tests. The table for Class 1 equipment (Non-Double Insulated) has the following specifications:
Rated 60 VDC or less: 500 VAC or 700 VDC for 1 second. Rated less than or equal to 130 VAC (184 VDC): 1000 VAC or 1400 VDC for 1 second. Rated more than 130 VAC (184 VDC) and less than or equal to 600 VAC (849 VDC): 1500 VAC or 2100 VDC for 1 second. It does seem strange that they would want him to run the tests for 1 minute as opposed to 1 second. I would go with the slightly higher voltages for 1 second to save time. I believe that the 2 times the (maximum) rated input voltage plus 1000 VAC is what is typically used for type testing, although I believe I have also heard this used for production line testing. This is also found in the booklet by Associated Research titled "A Basic Guide to Electrical Product Safety Testing" in the section on Hipot testing. Quoted directly from the booklet: "Test voltages are seldom less than 1000V, and for some products intended to operate at voltages between 100V and 240V, the test voltage can exceed 4000 volts (usually double insulated products). A rule of thumb that most safety agencies use to determine the appropriate test voltage is to multiply the DUT's normal operating voltage by two and add 1000V." By the way I strongly recommend this free booklet from Associated Research. It has a lot of good information in it. I hope this has been of some help to you. Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567 Enterprise Drive Westerville, Ohio 43081 voice: 614.846.6175 toll free: 800.848.4525 fax: 614.846.7791 http://www.tracewellsystems.com/ <http://www.tracewellsystems.com/> -----Original Message----- From: Mike Morrow [SMTP:mi...@ucentric.com] Sent: Thursday, September 28, 2000 2:52 PM To: EMC Society Subject: Canadian Hipot Requirements I'm posting this for a friend who is having a problem with CSA and hipot testing. He has several products which operate on 115/230 VAC. They are industrial control products (don't know the CSA standard number but they fall under UL508 is the US). In one CSA report he is required to run a 1500 VAC hipot for one minute (1800 VAC for one second), in another CSA report he is required to run 1000 VAC for one minute (1200 VAC for one second). I know the CSA hipot requirement is elusive and is required by the Canadian Electric companies. Can anyone help me give this guy some guidance? My feeling is that the 1500 VAC requirement is the "type" test and he should be using the 1000 VAC value for routine production tests. He has been told by CSA that anything under 50 VAC gets tested at 1000 VAC and that anything over that gets tested at 2 x rated voltage +1000 for production line tests. Seems strange. Mike Morrow Senior Compliance Engineer Ucentric Systems 978-897-6482 mi...@ucentric.com www.ucentric.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
