Koh ,
EN60335-1 is not the appropriate standard for your purposes, and I'd
be very suspicious of the supplier who claims it is.
There is no such standard as EN60335-2-207.
IEC742/EN60742 is definitely not the same as EN60335. EN60742 was the
standard for plug-top (and other) transformers but was superseded in
1998 by EN61558. Unlike EN60742 (which was a single part standard),
EN61558 has a part 1 (general requirement) and several part 2s
(particular requirements).
However, neither of these standards are what you want. You should
have tested your speakers to EN60065 or EN60950. (EN60065 is probably
the 'right' standard, but not everyone uses it!) Both standards
contains specific requirements for transformers (EN60950 - annex C,
EN60065 - section 14.3) and do not cross reference to any other
standard as being equivalent to their requirements. You must
therefore be very careful in relying on any transformer tested to
another standard since it is possible the test requirements of the
other standard are not consistent with those of the EN60065 or
EN60950.
In practice, the requirements of EN60950 and EN60065 are likely to be
similar to those of EN61558, and for your application you will
probably be safe using a transformer properly tested to EN61558. If
you want to rely on certification to EN61558, you will need to
perform a careful cross reference exercise to be sure of its
relevance/results for your application.
If you want my opinion, a company who claims compliance with EN60335
for this sort of product has already shown sufficient ignorance to be
discounted from my list of possible suppliers. I would not expect to
have difficulty finding a competitively priced supplier who can
provide independent certification to EN60065 and/or EN60950 for a
transformer of this type.
Regards
Nick.
At 23:44 +0800 1/8/2000, Koh Nai Ghee wrote:
Dear EMC-PSTC,
I'm posting this message again. (had posted to wrong address).
My company is currently designing a speaker system meant for ITE (that
is PC) connection.
The speaker requires external supply which the hardware team is looking
into using a AC/AC adaptor instead of AC/DC adaptor.
This AC/AC adaptor which steps down the 230Vac or 110Vac to the required
low voltage for the speaker supply.
A supplier of such AC/AC adaptor has said that their product complies to
EN60335-1 standards.
As I'm not familar with this standard, and need advice on the following
doubts.
1) Is this EN60335-1 equivalent to IEC 742 ?
2) Heard from a colleague (from his source) that EN 60335-2-207 should
be the standard ?
3) Was browing through the LVD Harmonised standard and unable to find
this 60335-2-207. Could someone advice what is this standard ?
4) Is this supplier statement of the AC/AC adaptor conforms to EN60335-1
sufficient? Or should this AC/AC adaptor meant for household &
electrical appliance required to fulfil EN60335-2-207 standard ?
5) Does EN60335-1 applicable to AC-AC adapter only ?
6) Are this standards (EN60335-1 and EN60335-2-207) still valid? Or it
has been obsolete/replaced?
7) Could this AC/AC adapter that complied with EN60335-1 be bundled with
ITE product meant for Home or Office use?
Looking forward to you advice.
Thanks in advance.
Regards
Koh
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