This Safety Standard which is established for protecting operators and environment stipulates safety requirements for measuring instruments and electric equipment. The IEC standard defines the degree of pollution, measurement classification, barrier, material, spatial distance and creepage distance to assure safety. The impulse withstand voltage as transitional energy is estimated from the measurement category and main power supply voltage to conduct tests for measuring instruments.
Nominal AC or DC line of main power supply and neutral voltage |
CAT.II | CAT.III | CAT.IV |
300V | 2500V | 4000V | 6000V |
600V | 4000V | 6000V | 8000V |
1000V | 6000V | 8000V | 12000V |