I agree with Barry-contact Richard. Also how does the transforner mfg
test the transformer????? Do you use a BABT approved transformer??
Richard will probably ask for those details.
Cynthia
treg @ world.std.com
11/12/96 05:06 AM
To: treg <treg @ world.std.com> @ SMTP
cc:
Subject: re: BABT 340 ISDN Dielectric Tests
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.
--
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// | Michael Wright | DSD Regulatory Compliance |
--- | Silicon Graphics, Inc. | Safety/Telecom/Ergonomics |
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-- | Email: [email protected] | Fax: + 1 415 962-9439 |
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