Not Allowed Power Cable Types; Power Cable Shield - ABB ACS880 Series Electrical Planning Instructions

26 Electrical planning guidelines
Cable type
Well-shielded (Al/Cu shield or ar-
mor) four-conductor cable (three
phase conductors and a PE)
PE
A single-core cable system: three
phase conductors and PE conductor
on cable tray
L1 L2
L2 L3 L3 L1 L1
Preferable cable arrangement to
avoid voltage or current unbalance
between the phases

Not allowed power cable types

Cable type
Symmetrical shielded cable with in-
dividual shields for each phase
conductor
￭

Power cable shield

If the cable shield is used as the sole PE conductor, make sure that its conductivity agrees
with the PE conductor requirements.
To effectively suppress radiated and conducted radio-frequency emissions, the cable shield
conductivity must be at least 1/10 of the phase conductor conductivity. The requirements
are easily met with a copper or aluminum 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.
Use as input power cabling
Yes
Yes
WARNING!
If you use unshielded high-
power input power cables
in an IT network, make sure
that the non-conductive
L3
outer sheath (jacket) of the
L2
cables have good contact
with a properly grounded
conductive surface, for ex-
ample, install the cables on
a properly grounded cable
tray. Otherwise voltage may
become present on the non-
conductive outer sheath of
the cables, and there is
even a risk of an electric
shock.
Use as input power cabling
No
PE
Use as motor cabling
Yes with motors up to 100 kW
(135 hp). A potential equalization
between the frames of motor and
driven equipment is required.
No
Use as motor cabling
No