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Hi just looked at a test result given on electrical installation cert to a friend for an install and wandered should alarm bells be ringing? R1+R2 = 0.41 ohms R2 = 0.21 ohms Zs = 0.2 ohms Now I thought Zs was obtained by Ze + (R1+R2) So I don't know how they arrived at 0.2 for Zs am i...

Hi we have a 1890's terraced (non cavity wall) in need of some tlc The front of the house probably needs re-pointing completely,but my initial concern is the ground level and up to the slate dpc.There are no visible signs of damp inside the house but as can be seen by the pictures the course...