How To Prevent Poor Insulation Of Neutral Terminal Blocks?

As a critical node in the electrical system, the insulation failure of the neutral terminal block may cause serious accidents such as short circuit and leakage. Systematic protection needs to be constructed from design, material selection, installation, testing, and maintenance of the five ring joint:

Optimize design layout: Adopt modular terminal blocks, reserve space for wire bending radius, and avoid direct contact of conductors with terminal edges. Three phase load balancing design reduces the erosion of insulation caused by harmonic currents.

Selected high-quality materials: PA66 terminal block with flame retardant grade V0 is selected, and the wire is insulated with cross-linked polyethylene layer, with a temperature resistance level of 90 ℃. The copper aluminum transition area uses dedicated terminal blocks to prevent electrochemical corrosion.

Standardized installation process: The length of wire exploitation is precisely matched with the terminal crimping area, and double nut locking method is used to prevent loosening. Use IP65 protection level terminal box in damp areas (such as bathrooms), filled with self expanding sealant inside.

Intelligent monitoring and warning: Install residual current electrical fire monitoring detectors to monitor insulation resistance values in real time. A temperature sensor is installed in the critical circuit to trigger an alert when the temperature rise exceeds 30 ℃.

Periodic maintenance plan: Conduct infrared temperature measurement every quarter, with a focus on detecting temperature gradients in the terminal block; Conduct insulation resistance testing (≥ 0.5M Ω) before the rainy season every year, and use ultrasonic testing equipment to investigate internal discharge phenomena.

By building a closed-loop management system of "active protection+intelligent monitoring+precise maintenance", the probability of insulation failure of neutral terminal blocks can be reduced by more than 85%, significantly improving the safety margin of electrical systems.