Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 31)

Network Design Considerations

2-14

TIWAY 1 TI505 NIM User Manual

2.3.6 Cable

Routing

Cable

routing should be planned as if the path between all stations on

the network were

free

of obstructions. Next, modify the first routing to account for obstructions, then

calcu

late

the amount of cable needed.

CAUTION

All

local and national electrical codes and fire codes should be observed

when

installing wiring.

In general, there are three types of network cabling routes:

 Under-floor

 In-ceiling



Surface ducting

Any

choice of these three routes may be used on a single network. The choice is often de

termined

by whether the building (or buildings) in which the network is being installed

new

construction, or is an existing building. The following paragraphs describe some of

the

advantages and disadvantages of each type of cable routing.

2.3.6.1 Under-floor Routing

For

under

-floor routing, the cable can be enclosed within ducts or, with raised flooring, in

the “open air

.” Under

-floor systems enclosed in ducts

are usually expensive, and while

they are better-protected against unauthorized taps than are “open air” systems, they

often

make future expansion of the network more difficult and expensive.

“Open

air” under

-floor cabling systems usually provide good access and allow maximum

network

expansion and flexibility

2.3.6.2 In-ceiling Routing

For in-ceiling routing, network cables are usually supported in troughs or with hooks

and clamps every 10 or 15 feet. In-ceiling installations provide flexibility, usually cost

less,

and provide easy access.

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 31

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