Siemens SINAMICS S120 Equipment Manual page 439

Figure 8-2
When selecting the miniature circuit-breakers, you must take into account the following
standards:
EN 61800-5-1, EN 60204-1, IEC 60364-5-52, IEC 60287-1 to -3, EN 60228 and UL 508C.
The following conditions for the conductors/cables should be used as basis:
● Ambient temperature 55 °C
● Limit conductor temperature ≥ 75 °C for operation with the rated load current
● Cable length max.:
Further, the conductors/cables should be routed so that
● max. 1 conductor pair, bundled and
● the 24 V conductors should be separately routed away from other cables and conductors
Booksize Power Units
Equipment Manual, (GH2), 07/2007, 6SL3097-2AC00-0BP5
Example of 24 V DC fuse protection
– 10 m for the supply cables
– 30 m for signal lines
that could conduct the operating current.
Cabinet Design and EMC Booksize
8.3 24 V DC supply voltage
439