Siemens SINAMICS S120 Manual page 251

Risk of fire and damage to equipment due to short-circuit/ground fault
The cables to the braking resistor must be routed so that a ground fault or short circuit can
be ruled out. A ground fault can result in fire with the associated smoke.
 Protect the cables from mechanical damage.
 Comply with local installation regulations that enable this fault to be ruled out.
In addition, apply one of the following measures:
 Use cables with double insulation.
 Maintain adequate clearance, using spacers, for example.
 Route the cables in separate cable ducts or pipes.
Note
Maximum cable length
A maximum cable length of 300 m is permissible between the Central Braking Module and
the braking resistor.
Note
Installation notes
Sufficient space must be available for dissipating the energy converted by the braking
resistor.
A sufficient distance from flammable objects must be ensured.
The braking resistor must be installed as a free-standing unit.
Objects must not be placed on or anywhere above the braking resistor.
The braking resistor should not be installed underneath fire-detection systems, since these
could be triggered by the resulting heat.
For outdoor installation, a hood should be provided to protect the braking resistor from
precipitation (in accordance with degree of protection IP21).
Cabinet Modules
Manual, 03/2013, A5E03263538A
WARNING
Cabinet Modules
5.7 Central Braking Modules
249