October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Inspection and tests to be carried out
1
75
the phase conductor only (not the neutral) to the protective conductor. This
is,
of course, the actual path taken by the fault current.
A typical circuit for an EFLI test is shown in Fig. 11.8. The mains supply
must be connected for this test. Tests at lighting outlets are similar to the test
shown for bonded metalwork, the test lead being connected to the metalwork
of the luminaire, when applicable, or other suitable point.
Earth electrode resistance
The test can be made either with current at power frequency supplied from
the mains via a double-wound transformer, or with alternating current fro
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