Siemens S7-400 Cable routing in cable ducts or fan subassemblies, Routing Fiber-Optic Cables

Wiring the S7-400

4.22Cable routing in cable ducts or fan subassemblies

Cable Routing

Depending on the number of cables and plug-in lines merging at the particular rack, the cross-section of the cable duct or fan subassembly may not be sufficient to accept all cables.

You should therefore route half the cables toward each side via the cable duct or fan subassembly.

Securing Cables

There are eyes for securing cables on both sides of the cable duct or fan subassembly (see Reference Manual Module Specifications, Chapter 6). You can secure the cables to these eyes with cable ties, for example.

Shield Contact

The cable duct and fan subassembly offer the facility of electrical contact for cable shields. You can use the shield clamps provided

(see Reference Manual Module Specifications, Chapter 9).

To establish contact for the cable shields, strip the outer insulation in the region of the shield clamp, and trap the cable shield under the shield clamp.

4.23Routing Fiber-Optic Cables

Cable Routing

Indoor fiber-optic cables (for example, for connecting synchronization submodules) are permitted for use in buildings, cable ducts, and channel trunking.

The maximum strain load when assembling is 1000 N and during operation 150 N.

Bending Radius

Minimum bending radius of the cables:

•At the connector: 55 mm

•Otherwise: 30 mm

4-38	Automation System S7-400	Hardware and Installation
		A5E00850741-01