00772425 datasheet(27/42 Pages) BURKERT

27 / 42 page

Type büS

büS network shielding

11.3

Network with direct shielded devices

Shield is grounded at multiple points to FE. Direct shield connection on both cable ends or at multiple

devices to FE has shielding effects against E and H fields. But take care for equipotential FE grounding area

to prevent compensation currents over shield!

Gateway

Device 1

(Direct)

Equipotential, clean FE area

Device 3

(Direct)

Device 4

(Direct)

Device 2

(Direct)

Fig. 27: Direct shielded device

If equipotential FE area is not feasible, e.g. between two buildings, there are some measures to improve;

e.g. add bypass conductor or a grounded cable duct nearby büS cable.

Gateway

Device 1

(Direct)

Building A: Equipotential, clean FE

Device 3

(Direct)

Device 4

(Direct)

Device 2

(Direct)

Building B: Equipotential, clean FE

Metal duct or strong bypass conductor

FE connected on both ends

Fig. 28: Direct shielded device, 2 buildings

Explanation of graphic elements:

▪ Each device-internal shielding (None, Direct, RC) is said in brackets.

▪ Green line represents büS cable shield.

00772425 Datasheet(PDF) 27 Page - Christian Bürkert GmbH & Co. KG