Discuss Calculating r1 from R1 + R2 in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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Mike Blair

Confused my self calculating r1 or 21 from R1+R2 on a ring circuit did this a while back and compared calculations with measurements to see the differences. but tried the other day think i have muddled the equation! or maybe because its monday haha can someone show me an example
 
theoretically what would it be isnt it devide by 4 to R1+R2?
Go and look at post 2 except substitute 1.64 for 1.67. Then read and re read until it sinks in also look at GN3 around ring final circuit testing. It is explained perfectly in there. But yes you are right "little r1+little r2"/4 should = R1+R2 I presume you mean Ze was 0.12? I mean you do know that little r1 and little r2 and little rn are the end to end measurements on ring yes? Sorry in advance if that sounds a bit rude it is not meant to be.
 
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