Use as motor cablingUse as input power cablingCable type
NoYes
WARNING!
If you use unshielded
single-core cables in an IT
network, make sure that the
non-conductive outer
sheath (jacket) of the cables
have good contact with a
properly grounded conduct-
ive surface. For example,
install the cables on a prop-
erly grounded cable tray.
Otherwise voltage may be-
come present on the non-
conductive outer sheath of
the cables, and there is
even a risk of an electric
shock.
A single-core cable system: three
phase conductors and PE conductor
on cable tray
Preferable cable arrangement to
avoid voltage or current unbalance
between the phases
1)
Armor may act as an EMC shield, as long as it provides the same performance than a concentric EMC shield of a shielded
cable. To be effective at high frequencies, the shield conductivity must be at least 1/10 of the phase conductor conductivity.
The effectiveness of the shield can be evaluated based on the shield inductance, which must be low and only slightly
dependent on frequency. The requirements are easily met with a copper or aluminum shield/armor. Cross-section of a
steel shield has to be ample and the shield helix low gradient. Galvanizing increases the high-frequency conductivity.
Not allowed power cable types
Use as motor cablingUse as input power cablingCable type
NoNo
Symmetrical shielded cable with in-
dividual shields for each phase
conductor
￭ Additional guidelines, North America
ABB recommends the use of conduit for power wiring to the drive and between the drive
and the motor(s). Due to the variety of application needs, metallic and non-metallic conduit
can be used. ABB recommends the use of metallic conduit.
The following table shows examples of various materials and methods for wiring the drive
in the intended application. See NEC 70 along with state and local codes for the appropriate
materials for your application.
In all applications, ABB prefers the use of symmetrical shielded VFD cable between drive
and motor(s).
94 Guidelines for planning the electrical installation
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