Insulation Requirements Of Wall Switches: Analysis Of Isolation Barriers For Live Components

The insulation resistance between the live socket and the socket body is ≥5MΩ. This is not an arbitrary value; it is a rigid threshold for maintaining safe operation of the Wall Switch socket when it is powered on. This indicator directly defines the physical path through which current should be strictly limited.

The failure modes of electrical isolation are clear: changes in air humidity, dust deposition, and surface contamination of materials gradually create potential leakage current paths. Impurity ions within the insulator migrate under the influence of an electric field, causing the resistance value to slowly decrease. When the insulation resistance falls below the critical value, it means that the socket body may become accidentally live.

The bulk resistivity of the material is the underlying support. High-quality polycarbonate (PC) or urea resin substrates typically have a bulk resistivity exceeding 10^15 Ω·cm. This provides the molecular-level material basis for the initial insulation performance. Material purity, molecular chain structure integrity, and additive selection collectively construct the microscopic insulation matrix.