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During continuity test in an installation, the megger indicated reading is:
0 Mega ohm
1 Mega ohm
500 Mega ohm
Infinity Mega ohm
0 Mega ohm
A continuity test is performed to verify that an electrical path is complete. A reading of 0╬й (or near-zero) indicates a closed circuit with negligible resistance, signifying perfect continuity.
A continuity test is performed to verify that an electrical path is complete. A reading of 0╬й (or near-zero) indicates a closed circuit with negligible resistance, signifying perfect continuity.
R=IVтАЛ тАФ Ohm's law defining resistance as the ratio of voltage to current
RcontinuityтАЛтЙИ0╬й тАФ Ideal condition for a complete electrical path
A megger (megohm meter) typically measures high insulation resistance by applying a high DC voltage. However, when switched to a lower scale for continuity testing, it acts as an ohmmeter. According to Ohm's law R=IVтАЛ, if the circuit is closed, the current flows freely, causing the resistance reading to drop to zero.
Continuity tests are used to locate breaks in wiring or open-circuited components.
A reading of 'Infinity' (R=тИЮ) indicates an open circuit or broken wire.
Meggers are primarily insulation testers but are equipped with ohmmeter ranges for versatility.
Always isolate the circuit from power sources before testing with a megger to prevent meter damage.
Detects hidden wire breaks
Verifies earthing integrity
Requires de-energized circuit
Can be damaged by residual voltage
Residential wiring inspection
Transformer winding integrity testing
Option D (Infinity) indicates an open circuit.
Values like 1 M╬й or 500 M╬й indicate insulation resistance, not continuity.
A is correct тАФ A reading of 0╬й signifies that the electrical circuit is complete and possesses negligible resistance.
Always remember: 0╬й means perfect continuity (short), while тИЮ╬й means no path (open).