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High Impedance On Domestic Tt System
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<blockquote data-quote="binky" data-source="post: 391351" data-attributes="member: 490"><p>I would suggest that it is avery stable reading, being under a concrete slab. Soil conditions are unlikley to change. I had a job once 3/4s of the way up a hill on bedrock, rod was 450ohms, I popped back a few times, it never changed. I those delightful Cornish coastal fishing villages like Polperro, now full of holiday homes, it is normal to take 1m drill bits and extended rods to get down to 500 ohms, but the readings are stable, improving in winter when it piddles down for a month.</p></blockquote><p></p>
[QUOTE="binky, post: 391351, member: 490"] I would suggest that it is avery stable reading, being under a concrete slab. Soil conditions are unlikley to change. I had a job once 3/4s of the way up a hill on bedrock, rod was 450ohms, I popped back a few times, it never changed. I those delightful Cornish coastal fishing villages like Polperro, now full of holiday homes, it is normal to take 1m drill bits and extended rods to get down to 500 ohms, but the readings are stable, improving in winter when it piddles down for a month. [/QUOTE]
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High Impedance On Domestic Tt System
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