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<blockquote data-quote="mainline" data-source="post: 523075" data-attributes="member: 34546"><p>I had this fault the other week 300ma time delayed sub main feeding a main building from there 100ma time delayed feeding 4 other buildings each having their own CUs all rcbo</p><p>Kept randomly tripping the 300ma turned out that there was n to earth leak on the main swa cable and a n to earth fault in one of the buildings on a light circuit ... The problem was that they were not DP rcbos so when rcbo tripped in building the n to earth fault still remained.</p></blockquote><p></p>
[QUOTE="mainline, post: 523075, member: 34546"] I had this fault the other week 300ma time delayed sub main feeding a main building from there 100ma time delayed feeding 4 other buildings each having their own CUs all rcbo Kept randomly tripping the 300ma turned out that there was n to earth leak on the main swa cable and a n to earth fault in one of the buildings on a light circuit ... The problem was that they were not DP rcbos so when rcbo tripped in building the n to earth fault still remained. [/QUOTE]
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