zs unexpected results

[scott 123]

Testing a ring final ..ze = 0.22
.r1 + r2 =0.65...
R2 +rn = 0.69
So calculated zs = 0.87
But when I test at sockets they are around 1.47

 

[Octopus]

This is going to start one of those debates....

It is exactly,what a competent tester could consider,as part of his investigation,but is frowned upon,by some assessors and instructors.

I reckon it is part of simplifying the instruction process,or one of a number of other reasons.

I have had this from trainers,and read this in many testing instructional books,but cannot see the difference between this "bypassing" and other bypass procedures,such as disconnecting bonding,for the purpose of a specific test.

One assessor i spoke to,concerning this anomaly,told me eventually "...well,bonding is one conductor,and one terminal..." and that bypassing any RCD,was "more involved..."

...Maybe it's just the same feeling of frustration,older dudes have,on finding some grads dissertation got a 1:1,with a spelling mistake on every other line,"coz,the content trumped it..." :icon12:

I wonder if the OP had done an R1 + R2 on another circuit on the same RCD, and then done a Zs, to see if the higher reading was consistent?