Use as motor cabling and as
brake resistor cabling
Use as input power cablingCable type
Yes with phase conductor smaller
than 10 mm
2
(8 AWG) Cu, or mo-
tors up to 30 kW (40 hp)
Yes
Four-conductor cabling in metal
conduit (three phase conductors
and PE). For example, EMT, or
four-conductor armored cable
Yes with motors up to 100 kW
(135 hp). A potential equalization
between the frames of motor and
driven equipment is required.
Yes
Shielded (Al/Cu shield or armor)
1)
four-conductor cable (three phase
conductors and a PE)
1)
Armor may act as an EMC shield, as long as it provides the same performance as 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. The cross-section of a steel shield must be ample and the shield helix must have a low gradient. A
galvanized steel shield has a better high-frequency conductivity than a non-galvanized steel shield.
Not allowed power cable types
Use as motor cabling and as
brake resistor cabling
Use as input power cablingCable type
NoNo
Symmetrical shielded cable with
individual shields for each phase
conductor
￭ Additional guidelines – North America
ABB recommends the use of metallic conduit for power wiring. ABB also recommends
the use of symmetrical shielded VFD cable between drive and motor(s).
84 Guidelines for planning the electrical installation
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