DSH 437 Verification of the rated residual making and breaking capacity ID m
http://decisions.iecee.org/icons/ecblank.gif DSH 437
Verification of the rated residual making and breaking capacity ID m
9.12.13
61009-1(ed.2)
Standard:
IEC 61009-1 (1996-12)
Sub clause:
9.12.13
Sheet No. 437
Subject
Verification of the rated residual
making and breaking capacity IDm
Key words: Confirmed at CTL
39th Meeting
Question:
9.12.13.1 refers to the test conditions prescribed in 9.12.1 and states that the impedance Z1 shall
not be used.
9.12.1 refers to the conditions in 9.12.1 to 9.12.12.
9.12.2 and 9.12.7.4 require the test circuits according to figures 5 to 9 together with impedance
Z2 to be used.
According to these figures the following inconsistency appears:
For a single pole switch (with two current paths) normally rated for 230 V, the rated residual
making and breaking capacity has to be tested at 230 V.
For a two pole switch normally rated for 400 V, the rated residual making and breaking
capacity has to be tested at 400 V.
For a three pole switch normally rated for 400 V, the rated residual making and breaking
capacity has to be tested at 400 V.
For a three pole switch with four current paths and for a four pole switch normally rated for
400 V, the rated residual making and breaking capacity has to be tested at 230 V.
Due to the fact that the purpose of this test is not to cover the special fault conditions in IT-systems,
the test voltage for this verification of the rated residual making and breaking capacity should be
230 V, independent of the number of poles, and the relevant figures should be corrected.
Decision taken at the SC23E WG2 meeting in Nice, October 2001:
Extract from the minutes IEC SC23E_WG2_006:
SC23E_WG2_010 request from Austria to update 61008 clause 9.11.2.3
The proposal made by Mr Bachl was considered justified and accepted. During the meeting
WG2 decided that laboratories and certification bodies should be informed about this
important decision.
Therefore the following statement was drafted:
2
Decision to be forwarded to CTL:
IEC SC23E WG2 decided to correct the inconsistent test requirement in IEC 61008-1 (1996-12), subclause
9.11.2.3 and in IEC 61009-1 (1996-12), subclause 9.12.13 - Verification of the rated residual
making and breaking capacity IDm.
The test voltage for this verification of the rated residual making and breaking capacity should be the
line to neutral voltage, independent of the number of poles of the RCCB or RCBO. This correction will
be included in the next amendment or revision of IEC 61008-1 and IEC 61009-1.
The revised test circuit (fig. 7) proposed for the standard is attached.
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