Leakage testing.

[alanjackson]

I have a Seaward PAT SERIES CHEKC BOX to check our pat testers between calibration.
We have a battery operated pat tester Seaward Primtest and 3 Metrel mi 3304 betatest plus testers.
The nominal values on my checkbox are
earth bond T2 0.523
Insulation test (class 1) 1.97
Earth leakage 0.61
These are my results
Seaward prime test Metrel (1) Metrel(2) Metrel (3)
Earth bond 0.5 1 0.5 0 0.52 0.54
Insulation 1.98 1.98 1.98 1.98
Earth leakage 0.36 0.49 0.71 0.71


As you can see the earth leakage is al over the place . Can anyone explain why these figures are not within the checkbox spec?

[Jim Wallace]

Alan, the values on any Checkbox are nominal values so some deviation is to be expected. As you say, there is quite a variation in the leakage readings. This may be due to the way in which the various testers maeasure leakage and the way in which they interact with the checkbox. Are you performing a powered leakage test i.e. a protective conductor current measurement as opposed to a substitute leakage measurement? Which model of PrimeTest are you using?