Overvoltage Class Description
The overvoltage level is divided according to the IEC60664 standard, which is
divided into four levels: CAT I, CAT II, CAT III, and CAT IV.
*
CAT I
is a low-voltage low-energy class with protective devices, generally
referring to the internal voltage of electronic equipment;
*
CAT II
is a low-voltage high-energy level, branched from the main power
supply circuit, and the 220V voltage of the home lighting circuit belongs to this
category;
*
CAT III
refers to the high voltage and high energy level, refers to the fixed
installation of the main power supply circuit, generally refers to 380V three-
phase voltage;
*
CAT
IV
refers to three-phase lines at utility power connections, any outdoor
conductors.
Overvoltage Category
CAT II
II
vi
Compliance Information
