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Guidelines for Installing Networked Automation Systems in Buildings

7-23

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

7.5 Mechanical Protection of Bus Cables

Protection of Electrical and Optical Bus Cables

Mechanical protection is required to protect bus cables from breaks or mechanical

damage.

Note

The guidelines for mechanical protection apply both to electrical and optical

cables.

Measures for Mechanical Protection

The following measures are recommended to protect bus cables from physical

damage:

S When cable cannot be installed on a cable rack or similar construction, it should

be installed in a conduit (for example PG 11-16).

S In areas where the cable is subject to mechanical stress, install the cable in a

heavy-gauge aluminum conduit or in a heavy-gauge plastic conduit (see Figure

7-5)

S When 90° bends are necessary and at the junctions between buildings (for

example expansion joints), a break in the conduit is acceptable only when there

is no likelihood of damage to the cable, for example due to falling objects (see

Figure 7-6).

S In areas where the cable is likely to be walked on or driven over, the cable must

be protected from damage by a closed heavy-gauge aluminum or steel conduit.

As an alternative, the cable can be laid in a metal cable gutter.

Figure 7-5 Mechanical Protection of the Bus Cable

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