文档介绍：IS O1 Interpretation of subclause
IEC 61558-1:1997, First edition
Safety of power transformers, power supply units and similar- Part 1 : General
requirements and tests
INTERPRETATION SHEET
Introd u ction :
WGI of TC96 has been requested to provide urgently a clarification of the bridge allowed by
resistors or capacitors between different conductive parts.
A clarification of subclause of IEC 61558-1 has been agreed by WGI of TC96 as
follows:
“ Conductive parts separated by double or reinforced insulation, . live parts and
the body or primary and secondary circuits, may be bridged (conductive bridge) by --`,``,,````,````,`,,,`,,`,-`-`,,`,,`,`,,`---
resistors or Y2 capacitors provided that they consist of at least two ponents
whose impedance is unlikely to change significantly during the lifetime of the transformer.
If the resistors are used they ply with the requirements of test (a) in of
IEC 60065. If capacitors are used they ply with the relevant requirements of
IEC 60384-1 4.
Where two capacitors are used in series, they shall each be rated for the total working voltage
across the pair and shall have the same nominal capacitance value.
If any one of such ponents is short-circuited or open-circuited, the values specified in
Clause 9 shall not be exceeded.
In addition, if the working voltage does not exceed 250 V, conductive parts separated by
double or reinforced insulation, . live parts and the body or primary and secondary circuits,
may be bridged by a single Y1 plying with the relevant requirements of
IEC 60384-1 4.
NOTE A Y1 capacitor is considered to have reinforced insulation.
Compliance is checked by inspection and by measurement.”
REMARKS
- This interpretation of subclause is not applicable to the transformer for toys covered by IEC 61558-2-7.
- This clarification having been introduced in the draft IEC 61558-1, Second edition, this interpr