What need to do electrical insulation resistance test?

Insulation resistance test mainly includes electrical equipment and power, lighting lines and other insulation resistance test must be shaken, piping and pipe threading before the acceptance of the quality of the sub-item and the quality of the completion of the unit project before acceptance, respectively, should be tested according to the system circuit, shall not be omitted. Electrical insulation resistance testing equipment should be valid within the validity period.

Electrical insulation resistance test materials required: NC682 insulation resistance tester, grounding wire, discharge rod.

The electrical insulation resistance test record requirements of the test instrument is generally used NC682 insulation resistance tester. Determination of megohmmeter voltage level: (1) according to "electrical installation engineering electrical equipment handover test standards" (GB

50150 - 2006) in the provisions of 3000V below to 500V electrical equipment or circuit, using 1000V megohmmeter. Since the Code for Quality Acceptance of Construction of Building Electrical Works (GB

50303

2002) specifies that the rated voltage of low-voltage wires and cables is 450/750V, a 1000V megohmmeter should be used, and the resistance value shall not be less than 0.5MΩ. (2) According to the specification, the cable line should be used with a 1000V megohmmeter, and the resistance value shall not be less than 1M (3) According to "electrical installation engineering electrical equipment handover test standards" (GB

50150 - 2006) in the provisions of the measurement of insulation resistance of the motor rotor winding, when the rotor winding rated voltage of 200V or more, using 2500V megohmmeter; 200V or less, should be used 1000V megohmmeter. In addition, the measuring instrument should be within the validity period of the calibration.

Insulation resistance is the most basic insulation index of electrical equipment and electrical lines. For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines at room temperature should not be less than 0.5MΩ (for equipment and lines in operation, the insulation resistance should not be less than 1MΩ/kV). The insulation resistance of low-voltage appliances and their connecting cables and secondary circuits should not be less than 1MΩ in general, and should not be less than 0.5MΩ in wetter environments, and should not be less than 10MΩ for small busbars of the secondary circuits.

The insulation resistance of hand-held power tools of class I should not be less than 2MΩ.