Instruction manual

7
Class II equipment is marked with the words "DOUBLE INSULATION" or the symbol
For double insulated under Safety Symbols:
Note 1 – Double Insulation is insulation comprising both basic and supplementary insulation.
Note 2 – Reinforced Insulation is a single insulation system with a degree of protection against electric shock, which is
equivalent to double insulation.
Testing of Electrical Equipment
Many testing personnel have some reservations in testing sensitive, electronic equipment using a 500V DC insulation test.
There is a perceived fear of causing internal damage from over voltage. With the introduction on the TnT Range of appliance
testers, these concerns are alleviated.
The TnT Range of electrical portable appliance testers are safe to test electronic equipment as the tests are carried from Active-
Neutral (shorted by a relay inside the tester) to Earth. No dangerous voltages pass through in this mode to the internal
components of the DUT (Device Under Test). If these tests are done using an Insulation Tester only and the user tests Active to
Neutral, this would be a cause of potential damage, this is why the TnT product range is far safer to use.
Some changes may be required in certain configurations where fitted surge protection devices (MOV's) in the DUT may cause a
failed test result. Applying 500V in this these situations can cause the surge protection devices to trip, therefore conducting the
applied voltage to earth, thus showing a failure of insulation. In these instances the test voltage should be changed to 250V then
retest. If DUT still fails, check with the DUT Operators Manual or an electrician. [for details see - ‘Double Insulation Test’
250/500VDC to change test voltage].
Under these circumstances, it would be difficult for any damage to occur to either the surge protection device or the DUT, as
there is insufficient current generated by the TnT-el appliance tester.
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-el & TnT+
models are designed to perform these tests).
NOTE: 10Amps MAXIMUM Resistive Load only (Standard TnT-el & TnT+ units).
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:
The TnT-el conducts earth continuity tests at Approx 200mA. Continuity tests at higher currents are not required and are
not recommended on certain equipment as this can cause severe damage or premature failure to the DUT under test (as per
AS/NZ3760).
3 Phase Testing:
3 Phase appliances can be tested by the TnT, TnT-el, TnT+ or the TnT-3PL appliance tester. This test is carried out by using
the adaptor connection sockets. As the insulation tests are from Phase to Earth, only a 500V insulation test is required. These
adaptors can be made by your electrician or purchased as an accessory. [See ‘Optional Accessories’ for details - when ordering
please state plug configuration of 3 phase plug. E.G. 5 pin Clipsal 56 series 20A].
Please note: These 3 phase adaptors cannot test 3 phase extension leads or perform 3 phase leakage test.
CAUTION: Ensure that these adaptors are used only for appliance testing