Insulation Resistance Testing
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As the exposed live and earth get wetter then a better conductive path to each other is going to decrease the resistance, as soon as that gets below 7666ohms (assuming your on 230v mains and using a standard RCD ) its going to trigger the RCD's 30 milliamp's tripping limit.
Nothing worse than to fault find an intermittent RCD tripping as you can test perfect but get the above scenario when it rains.
telx2010 3 weeks ago