2 Engineering
2.3 Safety and switching
DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com 43
2.3.3 Cable cross-sections
The mains cables and motor cables must be sized as required by local
standards and by the load currents that will be involved.
The PE conductor’s cross-sectional area must be the same as the phase
conductors’ cross-sectional area. The connection terminals marked with
must be connected to the earth-current circuit.
If there are leakage currents greater than 3.5 mA, a reinforced earthing (PE)
must be connected, as required by standard EN 61800-5-1. The cable cross-
section must be at least 10 mm
2
, or the earthing system must consist of two
separately connected earthing cables.
A symmetrical, fully screened (360°), low-impedance motor cable must be
used. The length of the motor cable depends on the RFI class and the
environment.
For US installations, UL-listed fuses, fuse bases, and cables (AWG) should be
used exclusively. These cables must have a temperature rating of 70 °C
(158 °F), and will often require installation inside a metal conduit (please
consult the applicable local standards).
NOTICE
The specified minimum PE conductor cross-sections
(EN 61800-5-1) must be maintained.
￫
Section 6.2, „Specific rated operational data“, page 147
provides the leakage currents for the individual models.
￫
Section 3.5, „EMC installation“, page 83 goes over the EMC
requirements for the motor cables.
￫
For the rated cable cross-sectional areas for DA1 variable
frequency drives, please refer to the technical data chapter in
Section 6.4, „Cable cross-sections“, page 161.
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