8.3 ½ x I RCD current rating (No-trip test)
1. Set the LEFT rotary range knob to the
1/2 I
RCD test range.
2. Set the RIGHT rotary range knob to current rating of the RCD under test
30
= 30 mA etc.
Ensure the display shows 0º in the display (see below):
3. Connect the instrument Phase (L1) and Earth (L2) terminals to the RCD phase and Earth terminals
(or to the phase and earth of the circuit the RCD is protecting).
Use either the separate leads
or mains plug leads.
RCD
g
L
N
E
MCB
L
N
E
MCB
g
4. Press the TEST button. The Display should show one of the following:
Touch voltage limit
Measured touch voltage
RCD Trip time (no trip)
RCD Type
RCD Test mode
If the RCD Trips, the MFT will flash the “trP” warning and then display the following:
X
5. Press the mode button to select 180º.
6. Repeat the above test.
Neither test should trip the RCD.
? ? ? ms = RCD FAILED (no trip)
>1999ms = RCD Passed
NOTE : For Type AC RCDs there is no need to perform a 180° test on the ½I mode, as the test uses
a full AC waveform.
www.megger.com MFT1800 series
39
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing
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