I agree with Pete, there is no reason to lift the ac safety ground. BABT 340 Table 3 test 4 requires that you measure the insulation resistance between earth ground and the PSTN ports (min of 5MOhms at a minimum of 100v). We combine this test with the Hi-Pot test by using a DC Hi-Pot tester calibrated to 2500vDC with a trip current of 0.5mA. This elimates a step in the process and the need for a megometer.
Dave Clement (BABT ALE) Motorola ISG _______________________________________________________________________________ To: [email protected]@INTERNET From: [email protected]@INTERNET on Fri, May 3, 1996 9:29 AM Jon, My company also makes telecom equipment for the UK, and we are required to run a similar test. (See BABT 340, Table 1, item 3.) However, we are NOT required to lift the ac mains safety ground connection before running the test. In fact, I fail to see the logic in doing so, unless the test might damage your power supply. Regards, Pete ______________________REPLY SEPARATOR___________________ List-Post: [email protected] Date: Thu, 2 May 1996 18:55:10 -0400 (EDT) From: Jon D Curtis <[email protected]> Subject: Re: BOUNCE [email protected]: Non-member submission from [[email protected]] > > This question is directed to individuals who have knowledge/experience with > shipping product with analog telco ports to the United Kingdom. As long as > 4 or 5 years ago, we were instructed by BABT to perform hipot testing > (1500vac or 2121 vdc) between analog telco inputs and the chassis on each > production unit. This requires separating the AC mains safety/earth ground > connection from the chassis. Is this still required? Are other companies > that sell telco type products to the UK doing the same thing? > > I have inquired BABT, but I am hoping for a faster response from TREG. > > Thanks, > George Seminsky > ---------------------------------------------------------------------------- Peter Van Raalte | Email: [email protected] Compliance Engineer | V-Band Corporation | Phone: 914-789-5117 565 Taxter Road | Elmsford NY 10523 | FAX: 914-347-3432 ---------------------------------------------------------------------------
