Neutral Block Standards and Specifications: Ensuring User Safety and Rights
As the core component of electrical connections, the standards and specifications of terminal blocks are directly related to user electrical safety and system stability. The following analyzes key specifications from four dimensions: materials, safety, installation, and certification, providing comprehensive protection for user rights.
1、 Material standard: Flame retardant and temperature resistance are the bottom line
High quality Neutral Blocks must use flame-retardant insulation materials, such as PA66 nylon or V0 grade flame-retardant plastic, to ensure that they will not burn or release toxic gases during high temperatures or short circuits. For example, in damp environments such as kitchens and bathrooms, IP68 waterproof terminals should be used to prevent water vapor from entering and causing short circuits; Outdoor or high-temperature areas (such as near water heaters) should avoid using ABS plastic terminals (with a temperature resistance of only 80 ℃) and instead use PBT material (with a temperature resistance of over 150 ℃) to prevent material softening and the risk of electrical leakage.
2、 Safety regulations: Details determine reliability
Wire diameter matching: The terminal aperture should strictly correspond to the cross-sectional area of the wire to avoid poor contact caused by looseness or damage to the wire caused by tightness. For example, the bending radius of a 6mm ² cable needs to be ≥ 48mm, and selecting too densely can easily cause insulation layer wear.
Insulation protection: After crimping, it is necessary to confirm that the terminal insulation sleeve completely wraps around the metal part to prevent accidental contact with live parts. For exposed areas, it is necessary to install barriers or use insulation tape for secondary protection.
Overload protection: The insurance type terminal block is equipped with a fuse or thermal circuit breaker, which can automatically cut off the current when the circuit is overloaded, preventing the wire from overheating and causing a fire.
3、 Installation standard: Standardized operation to reduce risks
Terminal spacing: The spacing between adjacent terminals should be ≥ voltage level × 0.5mm. For example, the spacing between 220V circuits should be ≥ 3.5mm to avoid creepage short circuits.
Clear identification: Each terminal should be labeled with its function, rated current, and wiring direction for easy maintenance in the future. For example, terminal boards with circuit voltages exceeding 380V need to be marked in red.
Regular inspection: It is recommended to have a professional electrician check the terminals for looseness and aging every 2 years, with a focus on checking the tightness of screws and the integrity of the insulation layer.
4、 Certification system: Authoritative endorsement brings peace of mind
Qualified products require multiple certifications:
Domestic standards: CQC certification, GB/T 13140 (mechanical strength, temperature rise testing);
International standards: UL, TUV certification (additional protection for export grade products);
Industry standards: IEC 60947-7 (Terminal Standard for Low Voltage Switchgear), GB/T 11918 (Technical Requirements for Terminals for Wires and Cables).
Suggestions for safeguarding user rights and interests
Priority should be given to products labeled with certification marks when making purchases, and "three no" terminals should be rejected;
Before construction, check the compatibility between the rated current of the terminal and the line load to avoid overload;
Keep purchase vouchers and construction records for future rights protection.
Although the Neutral Block is small, it is the "invisible goalkeeper" of electrical safety. From material selection to installation specifications, every step must strictly follow the standards in order to build a strong defense line for electrical safety and effectively protect the rights and interests of users.
