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A Martindale EX331 IEC to 110V adaptor lead, plus
TL157 PAT 110V adaptor is required to perform 110V
extension lead tests.
Test Connections
u
Refer to 110V the Extension Lead connection
diagram below.
u
Plug the TL157 110V adaptor into the HPAT600
front panel mains socket (1).
u
Connect the TL157 coupler to the 110V plug of the
110V extension lead under test.
u
Plug the EX331 110V plug into the coupler of the
110V extension lead under test.
u
Connect the other end of the EX331 to the HPAT600
IEC input socket (3).
u
Ensure that any switches are set to ON
u
Undertake a LEAD test (3.3)
NOTE: The TL157 PAT 110V Adaptor has a special
configuration of internal connections to enable the safe
testing of Earth Continuity and of Insulation Resistance
for 110V appliances.
However, for reasons of safety, the TL157 will not allow
a 110V extension lead to draw any run current through
the mains socket (1). (This is to prevent inadvertent
connection of a 110V appliance to 230V mains).
For this reason, the LEAD test of a 110V lead using
TL157 will always result in a FAIL on Polarity.
However the LEAD test will have tested already that
the Earth Continuity is satisfactory and will have tested
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