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.4 Press ‘TEST’ to start the test sequence. This can be automated in SETUP so the test starts when contacting the circuit. See section
10 Setup.
.5 On completion of the test, the display will show the loop resistance on the large display segments, and the fault current on the
small display segments.
7.2.3 Earth Loop measurements with an RCD in circuit
Loop testing L-N through an RCD will not trip it using the 2Hi test mode. However testing
Phase to Earth requires a test that draws less current and help prevent the RCD tripping. It is
impossible to guarantee that an RCD will not trip. If there is a risk associated with tripping an
RCD alternative methods should be used for testing the circuit.
Using 3 wire measurement - 3Lo
.1 Set the LEFT rotary range knob to the
L-PE
range.
.2 Press the Function key <-> to select the “3Lo” mode.
.3 Connect test leads as below, with the Red test lead connected to the L1 (Red terminal on the MFT, the Green test lead
connected to the Green (L2) terminal and the Blue test lead to the Blue (L3) terminal.
RCD
g
L
N
E
MCB
L
N
E
MCB
g
.4 Press ‘TEST’ to start the test sequence. This can be automated in SETUP so the test starts when contacting the circuit. See section
10.
.5 On completion of the test, the display will show the loop resistance on the large display segments, and the fault current on the
small display segments.
