Wiring Guidelines - Siemens SIMATIC TI525 Hardware And Installation Manual

APPENDIX B – GROUNDING GUIDELINES
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WIRING GUIDELINES

Consider the following guidelines before installing any system or power wiring.
D
Always use the shortest possible cable.
D
Use a single length of cable between components.
D
Do not connect short pieces of cable to obtain additional length.
D
Avoid placing system and field wiring in the vicinity of high-energy
wiring.
D
Keep field input wiring, output wiring, and all other types of wiring in
the panel physically separated.
D
Consider separating DC field wiring from AC field wiring wherever
possible.
D
Avoid sharp bends to power and data cables. Use 7.6 cm (3 inch) radius
on all bends.
D
A good low ground impedance of 0.1 ohm or less must exist for all
components in the system.
D
Use wireways for wire and cable routing when possible.
D
Keep wire strippings from falling into modules, controllers, or bases.
D
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.
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