Siemens SIMATIC TI500 Specifikace Strana 168

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6-3
Cabling and Wiring the System
SIMATIC 545/555/575 System Manual
In under-floor routing, the cable can be enclosed in ducts or, with raised
flooring, in the open air.
Duct systems are better protected against unauthorized taps or
terminal blocks, but expansion is more difficult and expensive than
with open air systems.
Open air systems provide more freedom of access, and allow maximum
system expansion and flexibility.
For in-ceiling routing, cables are usually supported in troughs or with hooks
and clamps every 10 to 15 feet (3 to 4.5 m).
Some advantages of in-ceiling routing are listed below.
Flexibility
Low-cost installation
Accessibility of cabling
Some disadvantages of in-ceiling routing are listed below.
Collection of dust and other debris in ceilings
Hazardous working conditions in ceilings
Impracticality for buildings without drop ceilings
Surface ducting is usually installed along baseboards or attached to walls at
desktop height. While surface ducting ordinarily protects cables from both
physical and electro-magnetic (EMI) effects, it usually requires I/O bases to
be positioned near a wall.
NOTE: Consult your cable vendor for proper cable-pulling techniques so that
no kinks occur in the cable during installation.
Under-Floor
Routing
In-Ceiling Routing
Surface Duct
Routing
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