This EN 50347 covers general purpose standard dimensioned three-phase induction motors for 50 Hz with rated voltages not exceeding 690 V for industrial purposes having dimensions selected from IEC 60072-1 in the range :

Frame numbers - shaft-heights : 56 mm to 315 mm
Flange numbers - pitch circle diameter of flange : 65 mm to 740 mm

It gives tables of fixing dimensions, shaft extension dimensions and output powers.