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hi all, just trying to get into some electrics, basics, been working as a free helper to get used to some for a friend of mine but im struggling to get my head around the R1+R2 TEST. ok i have tested my own house r1 = 0.63 so divide by 4 = 0.15 rn = 0.60 so divide by 4 = 0.15 r2 = 0.92...