Voltage Window

Frequency Window

Reference Standard

0.9 to 1.1 U_N

0.99 to 1.01 f_N

IEEE P1547

0.8 to 1.15 U_N

0.94 to 1.02 f_N

VDE 0126, OVE E2750 (partly)

0.8 to 1.2 U_N

0.994 to 1.006 f_N

DK 5950