Siemens SINAMICS S120 Manual page 420

Cabinet design and EMC
9.1 Information
NOTICE
Limiting of overvoltages
On systems with a grounded phase conductor and a line voltage >600 VAC, line-side
components should be installed to limit overvoltages to overvoltage category II according to
IEC 61800-5-1.
Note
Protection against the spread of fire
The converter may be operated only in closed housings or in higher-level control cabinets
with protective covers that are closed, and when all of the protective devices are used.
Converters of the Open Type/IP20 degree of protection must be installed in a metal control
cabinet or protected by another equivalent measure such that fire cannot spread and
emissions outside of the control cabinet are prevented.
Note
Protection against condensation and electrically conductive contamination
To ensure functional safety and safety functions of Safety Integrated, protect the converter,
e.g. by installing it in a control cabinet with degree of protection IP54 according to IEC 60529
or Type 12 according to NEMA 250. Further measures may be necessary for particularly
critical operating conditions.
A lower degree of cabinet protection is permissible, if condensation and conductive pollution
can be excluded at the installation site.
418
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3