On 7/29/96 Dave Spalding writes: > I understand that = >we can comply with either standard until March 2000 or 2001
As of April 1, 2000, new products will have to go the UL 1950 route. Products already evaluated under the appropriate standard can still be ok as long as no major changes have been made until April 1, 2005. After April 1, all products will have to meet UL 1950. One of the things that may determine your decision is the lifetime of your product. > because the PC would be tested to that (right?), Yup... >Also, the "fuse", he says, would be the etch on the board = >because they would just peel off with the overvoltage testing of UL = >1459. I am not comfortable with that, though. I am not comfortable with that either because there is nothing to keep the peeled off track from causing other problems, ie shorting out something. It is also hard to rely on track working as a fuse because of manufacturing tolerances. I am sure that whatever safety agency you choose will shake their head side to side if you tell them about this idea.(At least the ones I know about) > the difference between UL 1459 and UL 1950 Overvoltage criteria is almost the same. Major difference is that UL 1459 used Dielectric Strength testing as a method to insure adequate separation. UL 1950 does it both by Dielectrics and measurement of creepage & clearance. "All opinions are my own, not necessarily those of my employer" Eric Petitpierre Pulsecom Herndon, VA 20171 [email protected]
