MVA 02 rev 5 - December 2017
57 of 120
Openings for cable entries must be made in a way that prevents the cables from coming into contact with
sharp edges or moving parts, and in particular the impeller. If openings for cable entries must be made in the
casing, the openings must be fitted with suitable protective devices (grommets). In this case, consult the FVI
Technical Office. These precautions are applicable in particular if an external terminal box is fitted (EF series:
see fig. 5
– 8). On EFR series fans, the external terminal box is already provided by FVI.
Fig. 5-8 Example of positioning of external terminal box
The type of sheath protecting cables must be chosen according to the fluid moved by the fan. Unless
otherwise specified, FVI considers that the fan is used to move clean air.
Electrical connections to the external terminal box must be made with the same IP protection level as the
motor.
5.5
Connection to ducts
The fan must be connected to ducting with all parts correctly aligned, without obstructions to air flow from
gaskets or flexible components. The weight of ducting must not be supported by the fan, and deformations of
parts of the machine by ducting connections must be avoided. Any flexible joints between the fan and intake
and/or exit ducts must be installed in a way that prevents stress on flexible components, and that avoids
contacts between metallic parts of the joints (see fig. 5-9 for assembly tolerances).
Fig. 5-9
– Assembly tolerances for flexible joints
Theoretical Parallel misalignment Axial compression Angular misalignment
