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22 Electrical planning guidelines
Cable type
Well-shielded (Al/Cu shield or ar-
mor) four-conductor cable (three
phase conductors and a PE)
Not allowed power cable types
Cable type
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 prefers 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).
Wiring method
1) 2)
Conduit - Metallic
Electrical metallic tubing: Type EMT
Rigid metal conduit: Type RMC
Liquid-tight flexible metal electrical conduit: Type LFMC
2)
Conduit - Non-metallic
Liquid-tight flexible non-metallic conduit: Type LFNC
2)
Wireways
Metallic
Use as input power cabling
Yes
Use as input power cabling
No
PE
3)
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.
Use as motor cabling
No
Notes
Prefer symmetrical shielded VFD cable.
Use separate conduit run for each motor.
Do not run input power wiring and motor wiring in the
same conduit.
Prefer symmetrical shielded VFD cable.
Use separate conduit run for each motor.
Do not run input power wiring and motor wiring in the
same conduit.
Prefer symmetrical shielded VFD cable.
Separate motor wiring from input power wiring and
other low voltage wiring.
Do not run outputs of multiple drives parallel. Bundle
each cable (wiring) together and use separators where
possible.
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