Cord-connected equipment?
From: Elliott Martinson <[email protected]> Sent: Thursday, August 10, 2023 12:27 PM To: [email protected] Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change If it were to become a leakage current issue, Id wonder whether the parasitic inductance [i.e., enclosed loop area] in the current paths through the Y-Caps could be reduced, as that can often be much more meaningful than the actual capacitance value. If package choice and layout were already optimal, one might still be able to parallel 2x the # of caps but cut their capacitance values in ½ in order to increase the EMC margin without affecting leakage/touch current? Elliott From: Chester Summers <[email protected] <mailto:[email protected]> > Sent: Thursday, August 10, 2023 11:22 AM To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change Hi, Brian More margin is good but be sure to check that your leakage/touch current is still acceptable. Sometimes striking that balance means living with a little less emissions margin than an EMC guy would prefer. :) Good luck, Chet Summers From: Brian Gregory <[email protected] <mailto:[email protected]> > Sent: Thursday, August 10, 2023 10:01 AM To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change Think Before You Click: This email originated outside our organization. Yes, we increased the Y-Caps to get more margin. And we did! So, to qualify for a Class 1 permissive change, we'd need to show before & after data ? Applying for a Class 2 permissive change, means FCC will look only at the latest data to be sure it passes? Colorado Brian ---------- Original Message ---------- From: John Woodgate <[email protected] <mailto:[email protected]> > To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change Date: Thu, 10 Aug 2023 00:02:42 +0100 What are you changing about the Y-caps? If it's just a new supplier and the caps conform to the required component standard, there is no degradation. Reducing he capacitance would be a degradation for EMC but not for safety. Who determines the class is the person who has all the necessary data. The test house of surveillance authority check the decision. On 2023-08-09 23:20, Brian Gregory wrote: Hello EMC experts, A question came up today about filing new results to FCC for our legacy product. 1. If the filing is only for FCC, then the lab providing the report does not need A2LA accreditation, 2. If the filing is for a safety report, then the lab does need A2LA accreditation. Have I got that right? We're filing some small board changes, including Y-caps and can't figure out if this is a Class 2 permissible change, defined as: " includes those modifications which degrade the performance characteristics as reported to the Commission" 3. How or who determines if our change is Class 2 (degraded performance) or Class 1? We think the results are better, but it's not like we got uniformly more margin across the board. Thanks! Colorado Brian 720-450-4933 _____ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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