ABB PVS800-57B, Руководство по оборудованию, Страница: 37 / 84

Planning the electrical installation 37
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Sufficient shield conductivity to suppress emissions
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 cable shield 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.
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Recommended AC output power cable types
The power cable types that can be used for the inverter AC output are represented below.
1 Insulation jacket
2 Copper wire screen
3 Helix of copper tape or copper wire
4 Inner insulation
5 Cable core
Symmetrical shielded cable with three phase conductors and a concentric PE
conductor as shield. The shield must meet the requirements of IEC 61439-1, see
above. Check with local / state / country electrical codes for allowance.
Symmetrical shielded cable with three phase conductors and a concentric PE
conductor as shield. A separate PE conductor is required if the shield does not
meet the requirements of IEC 61439-1, see above.
Symmetrical shielded cable with three phase conductors and symmetrically
constructed PE conductor, and a shield. The PE conductor must meet the
requirements of IEC 61439-1.
A four-conductor system (three phase conductors and a protective conductor on a
cable tray).
WARNING! Ground all conductive cable supports, cable clamps and
individual conductive items close to cables, such as cable trays.
1
3
2
4
5
PE
PE
PE
PE