The selection of equipotential bonding connectors requires comprehensive consideration of grounding system capacity, application scenarios, technical specifications, and relevant standards.
Selection should be based on grounding system capacity and current-carrying capability: for general electrical equipment, the current-carrying capability should be at least 30 kA (with a recommended conductor cross-sectional area of ≥16 mm²); for industrial or control cabinets, at least 60 kA (≥25 mm²); for power switchgear, at least 100 kA (≥50 mm²); and for signal equipment, at least 10 kA (≥6 mm²).
Connector types should be selected according to the application scenario: welded-type connectors (offering low connection resistance and high mechanical strength) are suitable for permanent systems; testable connectors with inspection ports are appropriate for locations requiring periodic maintenance and inspection; corrosion-resistant connectors-featuring 316L stainless steel, hot-dip galvanization, or insulating protective sleeves-should be used in highly corrosive environments; and modular plug-in bonding blocks or terminal strips are suitable for scenarios requiring rapid installation and modular wiring.
Selection based on technical specifications requires verifying key electrical and mechanical parameters. These include: rated impulse current (Iimp), such as 50 kA; maximum continuous operating current (typically ≥50 A); response time (typically ≤100 ns); installed connection resistance (generally ≤0.1 Ω); insulation withstand voltage (typically ≥1500 V); operating temperature range (commonly -40°C to +85°C); and conductor connection area meeting product requirements (e.g., ≥35 mm²). Model selection and design shall comply with relevant national and industry standards. Key reference standards include GB 50057-2010 *Code for Design Protection of Buildings Against Lightning*, the GB/T 16895 series, GB 50343 *Technical Code for Protection of Building Electronic Information System Against Lightning*, GB/T 50065-2011 *Code for Design of Earthing of Industrial and Civil Electric Installations*, YD/T 5098 *Code for Design of Lightning Protection and Earthing Engineering for Telecommunication Bureaus (Stations)*, the IEC 62305 series of international standards, and TIA-607-C *Generic Telecommunications Bonding and Grounding (Earthing) for Customer Premises*.