Seaward PAC 1500Xi - Manual (Page 6)

4 Wire Tests
If the appliance is not fitted with a 13A plug or an Earth Bond test is required between
two components of the appliance then the PAC1500Xi can be used in a 4 wire mode. A
second Earth Bond test lead is connected to the green and black sockets within the
pouch (at the rear of the instrument) taking care to ensure correct connection as per the
colour coding. The two leads can then be connected across the earth bond requiring
test and the test carried out in the manner described in the previous section.
If this method is used it is important to ensure that the appliance is no longer plugged
into the 13A socket on the top plate of the PAC1500Xi.
Technical
The PAC1500Xi applies a low voltage between the earth pin of the top plate 13A socket
and the lead connected to the earth bond test terminal. An electronically controlled cur-
rent of a value set on the top plate selector switch is allowed to flow for a period of 6
seconds (or until the TEST button is released whichever is the shorter). The objective of
the test current selected is to test the appliance under load conditions (and as such the
test current must be selected to reflect these load conditions) and the duration of the
test is limited to 6 seconds to prevent damage or over-stressing which may be caused
by testing for prolonged periods.
INSULATION
General
The objective of this test is to ensure that the insulation between the phase or neutral
conductor of the appliance‘s mains supply and the metal casing of the appliance is
satisfactory and of high enough value to satisfy accepted safety standards.
Connections
For Class 2 tests the appliance should be connected as per Figure 2 ensuring that all
connections are firmly made and that the Insulation Test Lead is correctly inserted
according to the colour coded plugs and sockets.
For Class 1 appliances do not use the Test Lead.
The PAC1500Xi should be switched to INSULATION TEST.
The appliance under test must be switched on.
Procedure
The test should be initiated by depressing the TEST push-button. This button must
remain pressed throughout the duration of the test. If for any reason the test button is
released the test will be aborted.
At the start of the test the READY indicator will extinguish and the TIME OUT indicator
will light showing test signals are being applied to the appliance. The LCD display will
show the Insulation Resistance throughout the test.
For Class 2 appliances the insulation test lead should be touched on all exposed metal-
work of the appliance under test ensuring that at all times the insulation resistance sat-
isfies the accepted safety standards.
At the end of the 6 second test the TIME OUT indicator will extinguish and the LCD dis-
play will continue to hold the last test reading. Test signals are no longer applied to the
appliance. The TEST button can be released.
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