Appendix B: The Requirement Of Weighted Wideband Mode; B1 Earth Leakage Requirements From As/Nzs 4871 & As/Nzs 2081 - Ampcontrol MAG-153 User Manual

APPENDIX B: THE REQUIREMENT OF WEIGHTED WIDEBAND
B1 Earth Leakage Requirements from AS/NZS 4871 & AS/NZS 2081
The 2011 revision of AS/NZS 2081 correctly recognises that system protection must be assessed in
keeping with touch potential curves in AS/NZS 4871:2012 but acknowledges that this curve is for 50 Hz
(so power frequency) only. AS/NZS 2081 explicitly draws attention to the fact that 50 Hz curve sets are
not immediately applicable in systems that contain equipment capable of generating non-50 Hz
components, and that in such instances; touch potential calculations must be supported by individual
calculation to determine requirements at the frequency or frequencies of interest.
AS/NZS 2081:2011 Clause 1.1 Scope:
Whereas this standard is based upon 50 Hz supply systems it is envisaged that equipment
described may also be installed on systems with higher, lower or variable frequencies, or in DC
supplied systems. AS/NZS 60479 Part 1 and 2 should be referenced for the consideration of the
effects of current at other than supply frequencies on the human body.
AS/NZS 2081:2011 Appendix B3 Systems at other than 50 Hz Cyclic Frequency:
Where equipment is installed and operated within systems at other than a constant 50 Hz cyclic
frequency, the characteristics in paragraph B2 are not immediately applicable. In such instances
individual calculation to determine requirements at the frequency or frequencies in question will
be required.
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MODE
Figure B1: Source – AS/NZS 2081:2011 Appendix B
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MAG-153 Version 7 – JULY 2023
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