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Do-It-Yourself (DIY) Question & Answer Forum
Earthing Rod advice please 85 Ohm
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<blockquote data-quote="binky" data-source="post: 537856" data-attributes="member: 490"><p>TT systems can be confusing, you can have Zs with a 30mA RCd as high as 1667 Ohms in theory, however, if you were getting numbers like that I would say there's something seriously wrong with the rod or circuit. 85 Ohms is a good rod, the recommendation is less than 200 Ohms in dry weather, which means the earthing is good for summer weather, which in theory is much drier... The recommended resistance used to be 450 Ohms, but that doesn't always give good earthing in a drought, so was reduced some years ago.</p></blockquote><p></p>
[QUOTE="binky, post: 537856, member: 490"] TT systems can be confusing, you can have Zs with a 30mA RCd as high as 1667 Ohms in theory, however, if you were getting numbers like that I would say there's something seriously wrong with the rod or circuit. 85 Ohms is a good rod, the recommendation is less than 200 Ohms in dry weather, which means the earthing is good for summer weather, which in theory is much drier... The recommended resistance used to be 450 Ohms, but that doesn't always give good earthing in a drought, so was reduced some years ago. [/QUOTE]
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Earthing Rod advice please 85 Ohm
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