Murry for long underground cables test but varley usually for
short distance.
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A varley loop test is a test used to find the earth fault
location in an underground cable. It uses the Wheatstone bridge to
help determine the distance from the test point to a fault in a
telephone or telegraph line or cable.
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No reason. It is a post-test loop.
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pre-test
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The test condition in a loop is what's used to determine when
the loop should end.