Planning the electrical installation
52
Alternative power cable types
Power cable types that can be used with the drive are represented below.
The following power cable type is not allowed.
Symmetrical shielded cable with individual shields for each phase
conductor is not allowed on any cable size for input and motor cabling.
Symmetrical shielded cable: three phase conductors
and a concentric or otherwise symmetrically
constructed PE conductor, and a shield
Recommended
PE conductor
and shield
Shield
Shield
A separate PE conductor is required if the conductivity
of the cable shield is < 50% of the conductivity of the
phase conductor.
A four-conductor system:
three phase conductors
and a protective
conductor
Shield
PE
PE
PE
Not allowed for motor cables with phase
conductor cross section larger than 10 mm
2
[motors > 30 kW (40 hp)].
Not allowed for motor cables