Protection against electric shocks and electrical fires

Electrical protection of persons

• Electric shock
• Fundamental rule of protection
• Direct and indirect contact

Protection against direct contact

• Measures of protection against direct contact
• Additional measure of protection against direct contact

Protection against indirect contact

• Measures of protection: two levels
• Automatic disconnection for TT system
• Automatic disconnection for TN systems
• Automatic disconnection on a second fault in an IT system
• Measures of protection against direct or indirect contact without automatic disconnection of supply

Protection of goods in case of insulation fault

• Measures of protection against fire risk with RCDs
• Ground Fault Protection (GFP)

Implementation of the TT system

• Protective measures
• Coordination of residual current protective devices

Implementation of the TN system

• Preliminary conditions
• Protection against indirect contact
• High-sensitivity RCDs
• Protection in high fire-risk locations
• When the fault current-loop impedance is particularly high

Implementation of the IT system

• Preliminary conditions
• Protection against indirect contact
• High-sensitivity RCDs
• Protection in high fire-risk locations
• When the fault current-loop impedance is particularly high

Residual current devices (RCDs)

• Description of RCDs
• Types of RCDs
• Sensitivity of RCDs to disturbances