Structural Requirements For Neutral Blocks
As an important component for connecting neutral wires in electrical systems, the structure of neutral blocks must meet strict safety and functional requirements to ensure the stability and reliability of power transmission.
Electrical insulation performance
The neutral block needs to have good insulation performance to prevent leakage and electric shock accidents. The insulation material is usually made of engineering plastics such as polycarbonate (PC), nylon (PA), etc. These materials have high insulation strength and chemical corrosion resistance, and can withstand high voltages without being broken down. Insulated casing not only protects operators from electric shock, but also prevents external dust, moisture, and other factors from corroding internal conductive components, extending the service life of terminals.
Mechanical structural stability
The mechanical structure of the terminal needs to ensure stability under various working conditions. The shell design should avoid sharp edges and hardware burrs to ensure that live parts are not accidentally exposed. The connection strength of each component must meet the standards and maintain product stability under motion or vibration conditions. For example, the insertion and extraction force of plug-in terminals should be stable to avoid an increase in contact resistance; The creepage distance and electrical clearance of fence type terminals must meet the relay protection standards.
Current carrying and heat dissipation capacity
The neutral terminal needs to have sufficient current carrying capacity and effectively control the working temperature rise. The selection of materials for current carrying components is crucial, as a balance must be struck between high conductivity and heat resistance. For example, copper or copper alloy conductors can reduce contact resistance and decrease temperature rise. At the same time, the terminal structure needs to be designed with reasonable heat dissipation channels to prevent deformation of the shell or decrease in insulation performance caused by high temperatures.
electric-shock safeguard
Structurally, it is necessary to ensure that the operating components are not electrified and that the terminals connected internally are not accessible. The torque of the screw should be reliable to prevent accidental loosening of the wire and short circuits. For example, the grounding resistance of the grounding terminal should not exceed 0.5 Ω to ensure rapid conduction of electricity in case of leakage. The creepage distance and electrical clearance between terminals must comply with standards to prevent arc discharge.
Through strict structural design, the neutral block can meet various requirements such as electrical safety, mechanical stability, current carrying and heat dissipation, and electric shock prevention, providing a guarantee for the reliable operation of the power system.
