Section 6.7.5 deals with Earth leakage protection.
The section has been amended a number of times, including amendment 8 - so make sure your copy is totally up to date (Edition 1.8).
I see amendments from the original code arising in amendments 1, 3, 5, 6 & 8.
There are also other instances where ELU's are required or material to compliance, for example s6.16.1.4 and s6.16.3.2.3
Not to mention s6.15 - but that should be pretty obvious![]()
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