Greetings,
Please note that IEC 950 and all its clones, specifies in Clause 2.3.8,
last dashed paragraph:
--SELV CIRCUITS shall not use connectors compatible with those specified in
IEC 83 or IEC
320.
Very straightforward requirement. It doesn't mention or imply any
exclusions, so this applies
Which brings up the question about whether central office DC supplies which in
some countries or circumstances run up to 70 volts should be considered SELV
circuits.
We do not treat the central office supplies as SELV at Motorola. Isolation is
provided in switching supplies as with ac mains
Bob,
At 01:31 PM 03/11/1998 -0500, you wrote:
Which brings up the question about whether central office DC supplies
which in
some countries or circumstances run up to 70 volts should be considered SELV
circuits.
No, if they're over 60 V dc, they shouldn't. By definition, SELV must less
than or
Greetings!
I used to work for Lucent Power Systems which is a MAJOR supplier of
DC-powering equipment for telecom systems. We used IEC-320 connectors
in some of our products in non-AC roles. For instance: we used them as
input connectors to rack-mounted DC-to-DC converters (input: 48Vdc;
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