GB/T 16895.21-2020Low-voltage electrical installations - Part 4-41: Protection for safety. Protection against electric shock (English PDF)

National Standard of the People's Republic of China

ICS

13.260; 91.140.50

Classification

K09;Q77

Issued by: State Administration for Market Regulation, China National Standardization Administration

Contents

• 1 Scope
• 3 General requirements
• 3.1 Unless otherwise specified, the voltages in this section refer to the following voltages.
• 3.2 Protective measures should include.
• 3.6 The protective measures specified in Appendix C are.
• 3.9 The following parts may not adopt the fail-safe provisions.
• 4 Protection measures. automatically cut off the power
• 4.1 General
• 4.2 Requirements for basic protection
• 4.3 Requirements for fault protection
• 4.3.1 Protective earthing and protective equipotential bonding
• 4.3.1.1 Protective earthing
• 4.3.1.2 Protective equipotential bonding
• 4.3.2 Automatic power cut-off in case of fault
• 4.3.3 Power supply requirements for socket outlets and outdoor portable equipment
• 4.3.4 Additional requirements for luminaire circuits in TN and TT systems
• 4.4 TN system
• 4.5 TT system
• 4.5.4 When over-current protective devices are used, formula (2) shall be satisfied.
• 4.6 IT system
• 4.6.2 The exposed conductive parts should be grounded individually, in groups or collectively.
• 4.6.3 The IT system can use the following monitors and protective devices.
• 4.7 Functional Extra Low Voltage (FELV)
• 4.7.1 General
• 4.7.2 Requirements for basic protection
• 4.7.3 Requirements for failsafe
• 4.7.4 Power supply
• 4.7.5 Plugs and sockets