Quite honestly the BABT inspector is talking out of the wrong orifice. I think your tests are more than adequate. I suggest that you put your case to Richard Crossley the senior quality inspector. I would refer him to the note 5 of table 1 in Doc. 340. Quote 'This test (3) is not applicable to those NTP's connecting to digital networks' There are no requirements to test between SELV and digital interfaces.
Best regards Barry Singleton Approvals Specialist email:[email protected] Securicor 3net Limited Ringway House Bell Road Daneshill Basingstoke Hants RG24 8FB UK Tel: 44 (0)1256 792174 Fax: 44 (0)1256 840429 ------------- Original Text From: "Michael Wright" <[email protected]>, on 11/11/96 12:40: I would appreciate any guidance anyone can give me regarding BABT 340 and it's required Dielectric tests. For years now we have routinely done grounding continuity and hipot tests as described in 340. Recently, we had an auditor in who questioned the way the tests were being performed. We currently perform the tests as follows: 1) an earth continutity test of 25 A as described in No 1 of Table 1. 2) a test of 2121 vdc Line/Neutral - Ground (No 2) NTP - Ground (No 3) 3) a test of 4242 vdc Line/Neutral - NTP (No 5) Our auditor commented the following in a recent fax "The ISDN Line Barrier must then be tested separately by applying the test voltage to both sides of the transformers (that which you propose still has barriers in series!)" His comment refers to the way we test for #2. Basically we take the Line/Neutral/NTP connections and apply 2121 vdc between them and ground. He apparently thinks this is not sufficient and requests that we choose another point directly connected to the other side of ISDN transformer. This would be difficult to do in a production test. I think his request goes beyond what was intended for No 3 of Table 1. I think our current method is correct. -- -- _ ------------------------------------------------------------- // | Michael Wright | DSD Regulatory Compliance | --- | Silicon Graphics, Inc. | Safety/Telecom/Ergonomics | // | Mountain View, CA, USA | Tel: + 1 415 933-1344 | -- | Email: [email protected] | Fax: + 1 415 962-9439 | \/ -------------------------------------------------------------
