Alternative Power Cable Types; Motor Cable Shield - ABB ACS800-U4 Hardware Manual

Alternative power cable types

Power cable types that can be used with the drive are represented below.
Recommended
Symmetrical shielded cable: three phase conductors
and a concentric or otherwise symmetrically
constructed PE conductor, and a shield
PE conductor
and shield
A four-conductor system:
three phase conductors
and a protective
conductor.

Motor cable shield

To effectively suppress radiated and conducted radio-frequency emissions, the
shield conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminium shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
concentric layer of copper wires with an open helix of copper tape. The better and
tighter the shield, the lower the emission level and the bearing currents.
Shield
PE
PE
Not allowed for motor cables
Copper wire screen
Insulation jacket
A separate PE conductor is required if the conductivity
of the cable shield is < 50 % of the conductivity of the
phase conductor.
Not allowed for motor cables with phase
conductor cross section larger than 10 mm
[motors > 30 kW (40 HP)].
Helix of copper tape
Electrical installation planning
Shield
PE
Shield
2
Inner insulation
Cable core
43