Wiring Considerations; Guidelines - Siemens SIMATIC TI555 System Manual

2.7

Wiring Considerations

Guidelines

Pre-installation Guidelines
2-12
Consider the following guidelines before installing any system or power
wiring.
Always use the shortest possible single length cable.
Avoid placing system and field wiring in the vicinity of high-energy
and/or high frequency wiring.
Keep field input wiring, output wiring, and all other types of wiring in
the panel physically separated when possible.
Consider separating DC field wiring from AC field wiring wherever
possible.
Avoid sharp bends to power and data cables. Use 7.6 cm (3 inches)
radius on all bends.
Ensure that a good low earth ground impedance of 0.1 ohm or less
exists for all components in the system.
Use metal wireways and conduit when possible.
Keep wire strippings from falling into modules, controllers, or bases.
For long return lines to the power supply, do not use the same wire for
input and output modules. Using separate return wiring for these
modules minimizes the voltage drop on the return lines of the input
connections.
TI545/TI555 System Manual