Detailed Explanation of Open Circuit, Short Circuit, and Leakage Current

1. Open Circuit

An open circuit occurs when a conductor is broken and the current path is interrupted.
In simple terms, the wire is disconnected, so current cannot flow and the load stops working.

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2. Short Circuit

A short circuit occurs when the live wire and neutral wire come into direct contact.
This creates a very low-resistance path, causing a large current surge that can trip protection devices or damage equipment.

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3. Leakage Current

Leakage current happens when electricity flows to ground instead of returning through the normal circuit path.

Common causes:

• Live wire touching ground
• Neutral wire touching ground
• Live or neutral wire touching a metal enclosure
• Even without a ground wire, if live/neutral contacts a metal housing, leakage can still occur
  
  

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Detecting Leakage CurrentUsing a Clamp Meter

• Set the clamp meter to the AC current range
• Clamp both the live and neutral wires together at the same time
  
  

• Reading = 0 → No leakage
• Reading ≠ 0 → Leakage exists in the circuit
  
  

Because the outgoing and returning currents should be equal, any difference indicates leakage.

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Using a Multimeter (Outlet Test)

• Set the multimeter to the highest resistance range
• Measure between ground and neutral:
  • Infinite resistance → No leakage between ground and neutral
    
    
• Move the black probe to the live wire:
  • Resistance = 0 → Leakage between live and ground
    
    
  
  

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These tests help identify insulation failure or wiring faults and prevent electric shock hazards.