Wiring Arrangement - Siemens S5-100U User Manual

Installation Guidelines
3.4 Wiring Arrangement, Shielding, and Measures to Guard against
Electromagnetic Interference
This section describes the wiring arrangements for bus cables, signal cables, and power supply
cables that guarantee the ElectroMagnetic Compatibility (EMC) of your installation.
3.4.1

Wiring Arrangement

Wiring Arrangement inside a Cabinet
When a cabling system is installed in a cabinet, the wiring arrangement significantly affects inter-
ference immunity (EMC). Even during the planning phase, you should divide your cables into the
following three groups:
• Group 1
- Shielded data cables (for programmers, OPs, SINEC L1, ET 200 bus etc.)
- Shielded analog cables
- Unshielded cables for DC and AC 60 V
- Shielded cables for DC and AC 230 V
• Group 2
- Unshielded cables for DC and AC > 60 V and 230 V
• Group 3
- Unshielded cables for DC and AC > 230 V and 1 kV
You should install each cable group in the cabinet separately. Separate installation refers to wiring
that requires the following:
• Separate cable ducts
• Separate cable bundles
Note
Make sure that you have a minimum clearance of 10 cm (4 in.) between signal cables
and power cables conducting over 500 V.
When you install shielded cables, make sure that you install the shield on a shield support rail.
The shield should reach the module, but it should not be connected to the module.
EWA 4NEB 812 6120-02
S5-100U
3-29