Siemens SIMATIC NET Instrucciones de operaciones descargar pdf (Pagina 175)

Guidelines for Installing Networked Automation Systems in Buildings

7-27

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

Fitting strain relief

Make sure that you provide strain relief approximately 1 m from the connection

point on all cables subject to tensile force. Shield clamps are not adequate for

strain relief.

Pressure

Too much pressure on the cables must also be avoided, for example crimping the

cable when securing it in position.

Torsion

Torsion can lead to the elements of a cable being displaced and degrading the

electrical characteristics of cables. LAN cables must not be twisted.

Bending Radius

To avoid damage within the LAN cables, they must at no time be bent more

sharply than the minimum bending radius. Note that the permitted bending radii

S are larger when pulling in the cable under tensile strain than in the fixed,

installed state

S Bending radii for non-circular cables apply only to bending the flat, broader

surface. Bends in the narrower surface require much greater radii.

The permitted bending radii for your LAN cable can be found in the technical data

sheets of the LAN cables in Chapter 4 and 5.

Avoid Loops

When laying LAN cables, roll them tangentially from the cable drum or use

appropriate rotary tables. This prevents loops forming and resulting in kinks and

torsion.

Installing other Cables

Remember that cables must not be subjected to excessive strain and stress when

installed. This can, for example, happen when cables are installed along with other

cables on a common rack or in a common duct (providing this is electrically

permitted) and when new cables are pulled along the same path later (during

repairs or when extending a system).

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Siemens SIMATIC NET Instrucciones de operaciones Pagina 175