Voltage Class B definition
Voltage Class B means a: 30 V AC < rated voltage 1,000 V AC; and 60 V DC < rated voltage 1,500 V DC.
Voltage Class B means the classification of an electric component or circuit as belonging to voltage class B, if its maximum working voltage is (> 30 and ≤ 1000) V a.c. or (> 60 and ≤ 1500) V d.c. respectively