Seaward Supernova Elite - Manual (Page 98)

Insulation Test
88
Insulation Test
Warning
500 V / 250V d.c. test voltage
This test is used to verify that adequate insulation exists between the
mains supply pins and earth.
During the insulation test, a 500V DC voltage is applied between the
earth pin and both the live and neutral pins of the appliance mains
supply plug. The Tester displays the resistance measured and allows
the user to confirm sufficient insulation exists.
For Class 2 appliances, the Earth Bond Test clip can be used for an
earth return lead.
For appliances which incorporate over-voltage protection, a 250V DC
test voltage is provided to allow a reading to be taken without the
protection devices generating a false failure.
Substitute Leakage Test
The substitute leakage test applies a nominal voltage of 40V AC RMS
to the appliance and is applied between the earth pin and both the
live and neutral pins of the supply plug. For Class II appliances,
connect the Earth Bond test clip to the appliance as a substitute for
the Earth.
The Tester measures the current that flows and scales the result to
display a guide to the current that would flow if the test voltage had
been the nominal mains supply voltage, scaled for the applicable
socket.
Please note that values for Substitute Leakage may differ
substantially from that of conventional Earth Leakage tests because
of the way that the test is performed (e.g. it will be affected by the
presence of Neutral-to-Earth suppression capacitors).
This test can prove useful in situations where neither conventional
Insulation nor Flash tests are acceptable methods of testing the
insulation of the appliance.
Insulation Test