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2. Electrical safety testing - Wikipedia

   en.wikipedia.org/wiki/Electrical_safety_testing

   Live testing. Earth fault loop impedance testing: this test is to check that if a fault did occur, that the system meets requirements to cause a disconnection of the supply within the time limit specified by standards Insulation resistance testing Polarity test: a test to check that the connections are connected in the right sequence

3. Copper cable certification - Wikipedia

   en.wikipedia.org/wiki/Copper_cable_certification

   The delay skew test is used to find the difference in propagation delay between the fastest and slowest set of wire pairs. An ideal skew is between 25 and 50 nanoseconds over a 100-meter cable. The lower this skew the better; less than 25 ns is excellent, but 45 to 50 ns is marginal.

4. Cable fault location - Wikipedia

   en.wikipedia.org/wiki/Cable_fault_location

   Murray loop bridge. Murray loop test employs the principle of wheatstone bridge for locating the fault. To perform this test, it is necessary to have a sound cable running alongside the faulty cable. One end of the faulted cable is connected through a pair of resistors to the voltage source. Also a null detector is connected. The other end of ...

5. Multifunction tester - Wikipedia

   en.wikipedia.org/wiki/Multifunction_tester

   Multifunction testers are able to perform continuity tests (or low ohms resistance tests) and insulation resistance tests (or high ohms resistance tests) and they may also be able to perform earth fault loop impedance tests, prospective short-circuit current tests, earth electrode tests and RCD tests.

6. Continuity test - Wikipedia

   en.wikipedia.org/wiki/Continuity_test

   In electronics, a continuity test is the checking of an electric circuit to see if current flows (that it is in fact a complete circuit). A continuity test is performed by placing a small voltage (wired in series with an LED or noise-producing component such as a piezoelectric speaker ) across the chosen path.

7. Megger Group Limited - Wikipedia

   en.wikipedia.org/wiki/Megger_Group_Limited

   Digital line earth loop impedance tester 1985 Microprocessor-based high current test set 1989 Battery impedance test equipment (BITE) 1990 Automatic 10kV insulation power factor test set 1990 Microprocessor-based protective relay test set 1994 DSP-driven watthour meter test set 1996 Windows-based Testing Software Program 1999