Requirements for weather conditions in ground resistance measurement
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As is well known, measuring the ground resistance after it rains yields better results, but this is only a temporary effect. Generally, technical requirements specify that a ground resistance test can be conducted only after 7 consecutive sunny days following the rain – I’m not sure which standard sets this requirement
7 consecutive sunny days – that’s quite demanding. Generally, ground resistance tests are carried out before the thunderstorm season; usually, three days of sunshine is sufficient for such tests