Discuss zs unexpected results in the UK Electrical Forum area at ElectriciansForums.net
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
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
Don't know what happened to my last post so here goes again, your r1+r2 result, is that the figure of eight result? ( R1+R2)
Losing it big time here the result of 1.47 ohms is that the average of all the sockets? or is it from one particular socket which could be a spur?
Yes to the figure of eight and yes it was the average sockets were reading between 1.43 and 1.5
Agree with Wirepuller re the no trip!
Also when using the No Trip 15mA setting you can with certain RCD's get unusually high ZS readings due to the internals of the device.
Alarmbells should start ringing if the results are not what you expect and a futher bit of investigation work is needed to see if there is a problem!
Bypass the RCD and ZS the circuit from the DB using the 25A high current ZS test if in doubt!
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:
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