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Chapter 3 –
TnT+
Portable Appliance
Test Instructions
RCD TEST
[continued]
Menu 2
Press F3 to START test.
TnT+ display will display result for 20 seconds after mains supply is tripped.
!
CAUTION Pressing F3 at this point will cause tripping if RCD fitted to
circuit
.
TRIP CURRENT TEST.
This testing principal is designed to trip RCD devices using a
ramping up current value, to determine the trip current of the RCD device. This useful test
allows the user to determine circuit leakage load/pre-loading of RCD circuit. This can
assist in determining nuisance tripping issues or determining RCD performance if
suspected faulty or inconsistent in performance. The TnT+ has a nominal leakage current
of 2mA, which should be added to the result of test.
E.g. if RCD tripped at 22mA + 2mA (TnT+) =24mA trip current.
RCD Trip Current.
Press F2 for this option.
!
CAUTION Pressing F2 at this point will cause tripping if RCD
fitted to circuit.
The Trip Current Test will ramp the mA current up until the RCD breaker trips. Current
range 2.55 - 500mA. This test can go for up to 10 sec to scroll through full range if RCD
faulty or not fitted.
Repeated testing in this mode will cause heating of TnT+. Should over heating occur the
internal temperature sensor will cause display to indicate “over temp allow to cool”
This requires the TnT+ device to be best left unplugged for several minutes allowing unit
to cool.
!
CAUTION continuous ramp current testing will cause unit to over heat.
Summary of Contents for TNT+
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