Wavecom TnP-500 - Mains Supply Test Explained; No Connection No Test (NCNT) Function

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TnP-500 User Manual Wavecom
Mains Supply Test
Your TnP-500 checks the polarity and connectivity of the mains supply power and displays this information via
the LED Indicators. Each LED represents a comparison of the voltages between the Neutral to Earth, Active to
Earth, and Active to Neutral respectively.
If the A-E & A-N (green) lights are on and the N-E (red) light is off, the Mains Supply Test has
passed and you can continue with your testing.
If the central N-E light is on (red) there is a voltage difference between the Neutral and
Earth, or if there is no Earth connected to the TnP-500 supply (which is likely to occur when
working with a generator or inverter).
DO NOT PROCEED if the N-E light is on and you intend to conduct load/leakage tests. If you
are carrying out standard Insulation and Earth Bond tests, it is generally safe to continue.
If both of the N-E (red) & A-E (green) lights are on, consult a qualified Electrician. This
indicates a fault with the Mains Supply. DO NOT PROCEED with any testing on this Mains
Supply.
No Connection No Test (NCNT)
This test function ensures that the appliance is plugged into the TnP-500 and that it is switched on. If the
device is not plugged in and the TnP-500 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 override the NCNT function press F3 - This is done with User Discretion.
With an emphasis in the Standard AS/NZS 3760:2022 for carrying out the live testing the TnP-500 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/
NZS 3760:2022.
*Optional
Note: When using 3-Phase adaptors the NCNT function will need to be over ridden by pressing the ‘OK’ key prior to the
TnP-500 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.