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Protection against electrocution
 
 
 

2- Appliances earth-bonded

Securely bonding appliances to earth prevents electric shocks

 
 
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All internal and current-carrying parts of appliances like refrigerators, washing machines and air conditioning units are usually out of reach.

Yet, if an internal wire works loose or loses a scrap of its insulating sheath, the metal housing of the appliance may be energised.

Securely bonding each metal-housed appliance to earth with the green-yellow wire prevents such electric shocks: the protective device (MCB or RCD) trips as soon as the metal housing is energised.

 

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Protection against indirect contact can be provided by circuit-breaker if protective earth (PE) is cable-linked to the power source (TN System).