Flashcards
Live Testing: Instrumentation, Units and Range
Cards in this deck (5)
- 1Polarity (Live)Voltage Indicator and a proving unit (or known live source) will be used to check polarity of supply (live)
- 2Earth Fault Loop Impedance (Zs)Earth Fault Loop Impedance tester
Low Ohm
Note: External earth fault loop Impedance (Ze) is measured through an ELFI tester too.
- 3Prospective Fault CurrentProspective Fault Current Tester
Unit: kA
Note: an ELFI testeter is not the technical name of the instrument for this test.
- 4RCDRCD Tester
Unit: ms (milli-seconds)
Range: 1/2, 1, 5 times the rating of the RCD
Test: 0 and 180 degrees
- 5Functional TestingSwitches and isolators will need to be functionally checked to confirm it is operational.
RCD Test button (T) will need to checked quarterly (3 months).