DSH 589/06 Heat and fire protection
http://decisions.iecee.org/icons/ecblank.gif DSH 589/06
Heat and fire protection
3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
61558-1(ed.1);am1
Standard: IEC 61558-1/1997
A1/1998
Sub clause: 3.1.9.1
3.1.11
15.3 – 15.5 – 27.3
Sheet N°: 589/06
Page: 1 (1)
Subject: Heat and fire protection
Key words:
- Non-inherently short
circuit
- Proof transformer
- Fail-safe transform.
Meeting:
Decision confirmed
at 44th CTL meeting
Question: Can a small built-in transformer with integrated thermal cut-out (not
replaceable) be considered as non-inherently short circuit proof transformer
(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be
done according to 15.3 and 15.5? Both tests are to be performed on separate
models.
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal
link is used in the input circuit. It doesn’t matter whether the input circuit is
interrupted by the transformer itself or by a built-in thermal link that is not
replaceable.
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