User manual

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the equipment touching other earthed equipment or from touching the ground. Parallel earth
paths affect measurement accuracy and in worst case situations can lead to equipment
being passed as safe when there is no proper earth connection through the electrical outlet.
b. A hardware fault in the PAT400
c. A combination of the above.
Any reports of parallel paths should be investigated. Check to ensure If
the BOND (continuity) lead is not
connected to the null post on the PAT400. If not, the asset must be checked for additional earth paths.
These could be as high as 1.2 kΩ.
The PAT400 can be checked by disconnecting the equipment under test and re-starting the PAT400. If the
PAT400 does not report a fault, the problem exists on the equipment under test.
Testing an asset with multiple earth paths does not confirm the asset is safely earthed.
Additionally, parallel earth paths can affect the accuracy of the measured earth resistance, insulation test
or leakage measurements, therefore creating an unreliable PASS.