beautypg.com

A-14 – Siemens Automation System S7-400 User Manual

Page 182

background image

Assembling and Installing Systems

A-14

Automation System S7-400 Hardware and Installation

A5E00850741-01

Handling the Shields

Observe the following points with regard to the shield:

• Only use cable clamps made of metal to secure braided shields. The clamps

must surround the shield over a large area and provide good contact.

• Connect the shield to a shield bus immediately after entry of the cable into the

cabinet. Route the shield to the module but do not connect it there again to the

chassis ground or the shield bus.

• For installation other than in cabinets (for example, wall mounting), you can

provide contact between the cable shields and the cable duct.

Shown in the figure A-4 are some methods of securing shielded cables with cable
clamps.

Figure A-4

Mounting Cable Shields