Seaward ClareHAL - Manual (Page 99)

98
Ground (Earth) Bond Test
Caution
6V (no-load) 0- 40A AC test Current
This test is to ensure that the connection between the earth pin in the
mains plug of the appliance and the metal casing of the appliance is
satisfactory and of sufficiently low resistance. This test is usually done
on Class 1 (Metal Case) products only.
During the test, an AC voltage and the test current is applied between
the earth pin of the mains supply plug and the ground (earth) bond test
lead clip/probe. The test output box must be used for connection to
the EUT for this test. When a ground bond test probe (optional item) is
used the special (shorted) guard switch plug provided should be used
in combination to free user of pressing the guard switch during the test.
A high current is normally used to stress the connection under fault
conditions. The length of the test should be limited to prevent damage
due to overheating. Tests currents of up to 40A AC are available from
this tester. The test output currents, test duration and set resistance
HI/LO values limits are fully programmable. The Tester measures the
test values using a 4-wire measurement method then displays the
resistance measured and allows the user to confirm that sufficiently low
resistance exists within the EUT protective bonding path.
Caution
Prolonged use of the ground bond probe at high currents can lead to
a high probe temperature. Care should be taken to avoid touching the
probe tip under these conditions. The Tester’s internal over
temperature switch may operate with prolonged repetitive use of high
test currents. In this instance an error message will be displayed. In
order to proceed with further tests the Tester must be allowed to cool
down.
Your HAL tester