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TnT RCD
User Manual
Wavecom
TnT RCD
User Manual
Wavecom
Leakage Test
If there are any doubts with insulation testing of the equipment, the standard (AS/NZ3760 since 2001) allows
for an alternative test method. A Leakage Test can be performed instead. (The TnT RCD is designed to perform
these tests).
NOTE: The maximum resistive load for the TnT RCD is 10 Amps, and the maximum load for the TnT RCD 20A is 20 Amps
A Leakage Test applies power to the Device Under Test (DUT) and measures the imbalance of leakage current
from the DUT between the active and neutral conductors. The leakage is tested to the limits specified in the
standard and a Pass/Fail result as well as a digital reading is provided to ensure that the user gains as much
information as necessary.
Earth Continuity Test - Commonly called Earth Bond Test
Note: Part of normal (Class 1 test) procedure. Use supplied IEC–Alligator Clip lead or optional accessory ‘WCM-Probe kit’.
The TnT RCD conducts earth continuity tests at Approx. 200mA. Continuity tests at higher currents are not
required or recommended on certain equipment as this may cause severe damage or premature failure to the
Device under test (see AS/NZS 3760:2010).
Unique Earth Bond Test Feature
Note: Test time with the new TnT RCD can now be user controlled. This function enables testing personnel to extend the
Earth Bond test time by 30 second increments. This is achieved by momentarily pushing the ENTER button once, during
the test.
The TnT RCD will then add 30 seconds to the test time for ENTER button press.
This feature has been incorporated to provide extra time to achieve an adequate physical connection, or
confirm any possible INTERMITTENT issues. There may be situations where the condition of equipment,
coatings applied, or suspect wiring breaks may alter the earth connection path of the device under test.
Benefit to test personnel is to save time by not having to continually repeat tests in a less than perfect
situation.
Integrated Tests
Mains Supply Test
Note: The Mains Supply Test only applies when connected to Mains Power - if you are using your TnT RCD in battery mode,
you can disregard this.
The Supply Mains Test checks the polarity and connectivity of the mains supply by LED’s. This test is also a
part of all the testing functions of this unit.
If the central N-E light is on (red) and you need to conduct load/leakage tests DO NOT CONTINUE. If you are
carrying out standard Insulation and Earth Bond tests, it is generally safe to continue. This light will glow if a
voltage difference lies between the neutral and the earth, or if no earth is connected to the TnT RCD supply.
(If working with a generator or inverter, this is most likely to occur and you may need to consult an electrician
before proceeding).
If both the A-E & A-N (green) lights are on but not the N-E (red), the Mains Supply Test has passed and you can
continue with your testing. If both of the N-E (red) & A-E (green) lights are on, consult an Electrician, as there is
a fault with the Mains Supply.
Note: While in Battery mode, all LEDs will be off as no mains connected and supply mains test is not carried out.
No Connection No Test
This test function ensures that the appliance is plugged into the TnT RCD and that it is switched on. If the
device is not plugged in and the TnT RCD detects that no device is present, and prompts the user to plug in an
appliance to continue the test or press ‘QUIT’ to return to the main menu.
If for some reason the NCNT circuit does not detect the device but it is actually plugged in and turned on, the
operator will need to override the NCNT function.
To do this Over Ride Press F3 - Done with User Discretion
With an emphasis in the Standard AS/NZ3760:2010 for carrying out the live testing the TnT RCD appliance
testers will indicate for you to check if the device is plugged in and switched on. If the device is not plugged in
and/or recognised, it may require a live test therefore making it necessary for the operator to carry out a full
functional Leakage Test.
This function is to ensure that correct testing procedures are carried out in accordance with the Standard AS/
NZ3760:2010.
*Optional
Note: When using 3-Phase adaptors the NCNT function will need to be over ridden by pressing the ‘OK’ key prior to the TnT
RCD performing the assigned test. Some single-Phase appliances controlled by contactors will also require manual over
ride. In some instances, holding the ‘ON’ button will enable the NCNT function to work normally.
