Additional Guidelines, North America; Metal Conduit - ABB ACH580-01 Hardware Manual

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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).
Wiring method
1) 2)
Conduit - Metallic
Electrical metallic tubing: Type EMT
Rigid metal conduit: Type RMC
Liquid-tight flexible metal electrical conduit: Type
LFMC
Conduit - Non-metallic
Liquid-tight flexible non-metallic conduit: Type
LFNC
2)
Wireways
Metallic
2)
Free air
Enclosures, air handlers, etc.
1) Metallic conduit may be used as an additional ground path, provided this path is a solid path capable of
handling ground currents.
2) See NFPA NEC 70, UL, and local codes for your application.
3) Non-metallic conduit use underground is allowed; however, these installations inherently have an increased
chance for nuisance problems due to the potential for water/moisture in the conduit. Water/moisture in the
conduit increases the likelihood of VFD faults or warnings. Proper installation is required to make sure there
is no intrusion of water/moisture.

Metal conduit

Couple separate parts of a metal conduit together: bridge the joints with a ground
conductor bonded to the conduit on each side of the joint. Also bond the conduits to the
drive enclosure and motor frame. Use separate conduits for input power, motor, brake
Guidelines for planning the electrical installation 99
2)
3)
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.
Prefer symmetrical shielded VFD cable.
Allowed internally in enclosures when in accord-
ance with UL.