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High Impedance On Domestic Tt System
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<blockquote data-quote="Sidewinder" data-source="post: 391298" data-attributes="member: 9512"><p>Yes Steps terminology must be consistent and accurate I believe, looking at the scenario in the OP, I would say it's an impedance measurement, rather than an Ra, due to the difficulty in doing anything about improving it.</p><p></p><p>OP, go for a couple of 5/8" rods coupled.</p><p></p><p>Else core out the soil etc to a depth of say 2m, then put a rod down and backfill with Bentonite or similar.</p><p></p><p>However, it's only a note to table 41.5 that requires it to be &lt;200 Ohms which refers to 542.2.4.</p><p></p><p>Difficult one, should be improved and might be unstable are a bit wooly, it could also be OK and very stable @ the values you have.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 391298, member: 9512"] Yes Steps terminology must be consistent and accurate I believe, looking at the scenario in the OP, I would say it's an impedance measurement, rather than an Ra, due to the difficulty in doing anything about improving it. OP, go for a couple of 5/8" rods coupled. Else core out the soil etc to a depth of say 2m, then put a rod down and backfill with Bentonite or similar. However, it's only a note to table 41.5 that requires it to be <200 Ohms which refers to 542.2.4. Difficult one, should be improved and might be unstable are a bit wooly, it could also be OK and very stable @ the values you have. [/QUOTE]
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