MPI-536 – USER MANUAL
3.6.5 Earth resistance measurement with two-clamp method (2C)
The double-clamp measurement may be applied where there is no possibility to use
electrodes driven into the ground.
The double-clamp method may only be used when measuring multiple earthing (it
is necessary to provide a return path for the test current).
For ring earth electrodes (step variant ) the method allows switching off to
determine continuity of the measured earth electrode point with the rest of the
earth electrode.
Transmitting clamps and measuring clamps should be attached to the tested earth elec-
trode at a distance of at least 30 cm from each other.
The arrow on the clamps can be directed in any direction.
Connect the transmitting clamps N-1 to H and E socket.
Connect the measuring clamps C-3 to the clamp socket.
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