Siemens SINAMICS S120 Equipment Manual page 271

Warning
The DC link connection cables must be routed in such a way as to ensure that they are
ground-fault and short-circuit proof in accordance with DIN/VDE 0100 or suitable fuse
protection must be provided.
Caution
The total length of the DC link (including the connection cables) must not exceed 10 m.
Equipment Manual for Booksize Power Units
Equipment Manual, (GH2), 03/2006 Edition, 6SL3097-2AC00-0BP3
Options
7.2 DC link supply adapter
7-19