Under-Floor Routing; In-Ceiling Routing; Surface Duct Routing; Mounting The Tap Or Terminal Block - Siemens SIMATIC TI555 System Manual

Under-Floor
Routing

In-Ceiling Routing

Surface Duct
Routing
Mounting the Tap
or Terminal Block
TI545/TI555 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 or 15 feet (3.05 or 4.57 m).
Some advantages of in-ceiling routing follow:
Flexibility.
Low cost installation.
Accessibility of cabling.
Some disadvantages of in-ceiling routing are:
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 (E/M) 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.
Installation procedures for mounting the tap or terminal block depend upon
the cable installation technique used. Refer to mounting instructions
provided by the tap or terminal block vendor.
Cabling and Wiring the System
4-5