Voltage Window

Frequency Window

Reference Standard

0.9 to 1.1 UN

0.99 to 1.01 fN

IEEE P1547

0.8 to 1.15 UN

0.94 to 1.02 fN

VDE 0126, OVE E2750 (partly)

0.8 to 1.2 UN

0.994 to 1.006 fN

DK 5950