The standard for Isolating Transformers and Safety Isolating
Transformers is IEC 742 (EN 60742).
It applies to stationary/portable, single/poly phase, air cooled
trafos having a rated supply voltage not exceeding 1 kV and rated
frequency not exceeding 500 Hz.
Brian McAuliffe
______________________________ Reply Separator _________________________________
Subject: Re: Transformer Approvals
Author: [email protected] at smtplink-tellabs
List-Post: [email protected]
Date: 04/02/97 9:53
EN60704 is the CENELEC version of IEC 704. IEC 704 is titled "Test Code for
the determination of airborne acoustical noise emitted by household and
similar electrical appliances"
I suspect that the are making an unresonable request!
Hans Mellberg
EMC Consultant
______________________________ Reply Separator _________________________________
Subject: Transformer Approvals
Author: Non-HP-owner-emc-pstc ([email protected]) at
HP-Boise,mimegw2
List-Post: [email protected]
Date: 02/03/97 12:46 PM
At the end of last year, we shipped a piece of laboratory equipment to France
that required CE approval. We evaluated it for approval as laboratory equipment
in terms of complying with EN 61010-1. It was evaluated for EMC compliance. In
this piece of equipment, I used (2) transformers that posses EN 60950
certification. The company that purchased the equipment, retained another
company to evaluate CE compliance. They have indicated that these transformers
are unacceptable as they do not posses certification to either EN 60704 or EN
607542.
I don't have a copy of either of these standards available at the moment,
although we are looking into purchasing a copy. Can someone give me some idea
as to why a transformer meeting these requirements is believed by this company
to be necessary or if there is something that I can do to make the existing
transformers acceptable for use?
Thanks for any assistance that you can provide..
John Bielot
