4.1.4 Earthing and IT Mains
The earth connection cable cross section must be at
least 10 mm
2
or 2 rated mains wires terminated
separately according to
EN 50178 or IEC 61800-5-1
unless
national regulations specify differently. Always comply
with national and local regulations. on cable cross-
sections.
The mains is connected to the main disconnect switch if this is
included.
Check that mains voltage corresponds to the mains
voltage of the frequency converter name plate.
Illustration 4.2: Terminals for mains and earthing.
IT Mains
Do not connect 400 V frequency converters with RFI-
filters to mains supplies with a voltage between phase
and earth of more than 440 V.
For IT mains and delta earth (grounded leg), mains
voltage may exceed 440 V between phase and earth.
Electrical Installation
VLT
®
HVAC Drive Operating Instructions
MG.11.AD.02 - VLT
®
is a registered Danfoss trademark
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