Ring Final Testing - Why (r1+r2)/4 is R1+R2.

Explanation of why the resistance of the line and protective conductors added together and divided by 4 is the same as R1+R2. The explanation is covered in Guidance Note 3, however not in BS7671 or the On Site Guide. Ring final circuit tests in more detail: https://youtu.be/BKyK0-_v5xc

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