Power Cable Shield; Grounding Requirements - ABB ACS480-04-09A8-1 Hardware Manual

52 Guidelines for planning the electrical installation
resistor, and control wiring. Do not run motor wiring from more than one drive in the
same conduit.
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Power cable shield

If the cable shield is used as the sole protective earth (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.
1 Insulation jacket
2 Helix of copper tape or copper wire
3 Copper wire shield
4 Inner insulation
5 Cable core

Grounding requirements

This section gives general requirements for grounding the drive. When you plan the
grounding of the drive, obey all the applicable national and local regulations.
The conductivity of the protective earth conductor(s) must be sufficient.
Unless local wiring regulations state otherwise, the cross-sectional area of the protective
earth conductor must agree with the conditions that require automatic disconnection of
the supply required in 411.3.2 of IEC 60364-4-41:2005 and be capable of withstanding
the prospective fault current during the disconnection time of the protective device. The
cross-sectional area of the protective earth conductor must be selected from the table
below or calculated according to 543.1 of IEC 60364-5-54.
This table shows the minimum cross-sectional area of the protective earth conductor
related to the phase conductor size according to IEC/UL 61800-5-1 when the phase
conductor(s) and the protective earth conductor are made of the same metal. If this is
not so, the cross-sectional area of the protective earth conductor must be determined
1 2 3 4 5