Insulation resistance

The insulation resistance is the DC resistance of the insulation under specified conditions.

Insulation resistance is the most basic insulation indicator for electrical equipment and electrical wiring. For the handover test of low-voltage electrical devices, the insulation resistance of the motor, power distribution equipment and distribution lines at normal temperature should not be lower than 0.5MΩ (for the equipment line in operation, the insulation resistance should not be less than 1000Ω per volt of operating voltage).

The insulation resistance of low-voltage electrical appliances and their connecting cables and secondary circuits should generally not be lower than 1MΩ; in relatively humid environments, it should not be lower than 0.5MΩ; the insulation resistance of small-circuit small busbars should not be lower than 10MΩ. The insulation resistance of Class I handheld power tools should not be less than 2MΩ.

Insulation resistance: DC voltage is applied to the dielectric. After a certain period of polarization, the corresponding leakage current flowing through the dielectric is called insulation resistance.

The general resistance is the resistance of the substance to the current, which is called the resistance of the substance.

Insulation resistance is an insulation index, which is the degree of insulation of the conductor to the outside world, and the resistance is an indicator of the current resistance of the conductor itself.