Alternative Power Cable Types; Motor Cable Shield - ABB ACS800 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 or copper wire.
The better and tighter the shield, the lower the emission level and bearing currents.
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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
or copper wire
Planning the electrical installation
Shield
PE
Shield
2
Inner insulation
Cable core
43