Trip-Out Time (Rcdt) - METREL MI 3122 Instruction Manual

MI 3122 Smartec Z Line-Loop / RCD
Loop resistance is indicative and calculated from Uc result (without additional proportional
factors) according to:
Figure 5.3: Example of contact voltage measurement results
Displayed results:
Uc ....... Contact voltage.
Rl ........ Fault loop resistance.
Rmax .. Maximum earth fault loop resistance value according to BS 7671.

5.1.2 Trip-out time (RCDt)

Trip-out time measurement verifies the sensitivity of the RCD at different residual currents.
Trip-out time measurement procedure
Select the
RCD

Set sub-function RCDt.

Set test parameters (if necessary).

Connect test cable to the top of the instrument.

Connect test leads to the item to be tested (see figure 5.2 ).

Press the TEST key to perform the measurement.

Store the result by pressing the MEM key (optional).

Figure 5.4: Example of trip-out time measurement results
Displayed results:
t .......... Trip-out time,
Uc ....... Contact voltage for rated I
U

.
C
R
L
I

N
function using the function selector switch.
N
.
26
Testing RCD
UK version