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Test Mode Summary
Test Sequence
For safety reasons, it is important that appliance tests
are carried out in the correct sequence:-
•
Circuit Test
•
Fuse Test (if necessary)
•
Earth Continuity Test
and / or
•
Earth Bond Test
•
Insulation Test
If a fault on an appliance is detected, testing must be
stopped and the fault rectified. Testing must then re-
commence from the beginning of the test sequence.
Circuit Test
A low voltage d.c. Resistance test of the Phase to
Neutral circuit.
FuseTest (if supply or appliance fuse is suspect)
Checks the continuity of most types of fuses when
removed from the appliance.
Earth Continuity Test
The earth continuity test may only be performed on
Class I (Earthed) appliances.The test checks protective
conductor continuity and the earth connection to the
metal parts of the appliance at a current of 100 mA.
This test is used where a higher current Earth Bond test
may cause damage to the appliance. A very low voltage
(100 mV) is established between the main supply plug
earth pin and the metal parts of the appliance. The low
voltage of this test is designed to reveal bad connections
by not breaking down any oxide films.
Earth Bond Test
The Earth Bond test may only be carried out on Class I
(earthed) appliances.
The test checks protective conductor continuity and the
earth connection (or Bonding) to the metal parts of the
appliance. A very low voltage is established between the
main supply plug earth pin and the metal parts of the
appliance.
A choice of two Earth Bond tests is available:-
i)
Passing a current of 10 Amp. Used for
appliances and equipment fused at 5 Amp or
less.
ii)
Passing a current of 25 Amp. Used for
equipment fused at greater than 5 Amp.
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