2 Engineering
2.3 Safety and switching
52
DA1 Variable Frequency Drives
08/18 MN04020005Z-EN
www.eaton.com
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 a US installation, UL-tested fuses, fuse bases and cables (AWG) must
exclusively be used.
The approved cables must have heat-resistance of 70 °C (158 °F) and often
require installation in a metallic protective tube (see the local regulations).
WARNING
The specified minimum PE conductor cross-sections
(EN 61800-5-1) must be maintained.
￫
c rated operational data”, page 148
defines the leakage currents for the individual models.
￫
section 3.5, “EMC installation”, page 91 defines 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
