Routing Of Cables - Siemens sed2 Commissioning Manual

4.4.2 Routing of cables

• Lay cables of different power sections, such as control, mains and motor cables, separately
• Avoid undesired coupling caused by parallel running control, power and motor cables
• Lay control, mains and motor cables separately, in separate cable ducts at a distance of at least 200 mm (see
illustration below). If cables must be crossed, run them at an angle of 90° if possible
• Keep cables to motors as short as possible, generally not exceeding 25 m
• If possible, lay external cables in sheet metal ducts or on metal carriers. The metal cable duct or carrier should
be earthed and its individual parts should be galvanically connected
• If it is not possible to run control, power and motor ca-
bles separately in separate cable ducts or cable carri-
ers, the cable duct or carrier must at least have metallic
galvanically conductive partitions
IP 54: Example of EMC-compatible installation and wiring of the SED2
Control cabinet
Metal partition
BMS
F1
III
I/O modules
Connection
terminals
10/80
Siemens Building Technologies
HVAC Products
> 40 cm
Signal / control cable
Supply air
F2
III
SED2 / IP54
Power Supply
cable unshielded
*
Connection and
potential
equalization rail
Strain
relief rail
*
Commissioning Guide
4 EMC-compatible installation of SED2
Motor cable
> 20 cm
Mains cable
90°
> 20 cm
5192Z37en
Signal and
control cables
Extract air
SED2 / IP54
Metal
cable gland
*
Metal
cable glands
Plastic cable gland
* All potential equalization cables must have
a cross-sectional area of at least 16 mm
Metal partition
Motor cable
Monoblock
Service
switch
Extract air
Service
switch
Shielded cables
Supply air
Min.16 mm 2
Potential
equalization
*
2
CM1G5192en
26.02.2003