Siemens SIMATIC ET 200AL System Manual page 1579

Seq.
no.
11
* Version with remote indication contact
Components of the series BLITZDUCTOR® XT can be remotely monitored with the appropriate
accessories. Additional information is available on the Internet (http://www.dehn.de)
Components can be ordered directly from:
DEHN+SÖHNE GMBH+CO.KG.
Hans-Dehn-Straße 1
D-92318 Neumarkt
Rule for the transition from lightning protection zone 0
The transition from lightning protection zone 0
electromagnetic coupling and serves as overvoltage protection. The following applies to the
transition at the interface from lightning protection zone 0
● Use of power cables with surge current-carrying cable shields or twisted-pair IT cables
● Laying cables and lines
● Use of fiber-optic cables without a metal shield if such a transmission is intended
● Creation of local equipotential bonding at the transition of lightning protection zones, with
Additional measures
If the actions listed above cannot be implemented, protection by means of overvoltage
arresters must be provided. The following sections contain tables with overvoltage arresters
that are very suitable for protecting the plant.
Designing interference-free controllers
Function Manual, 06/2014, A5E03461486-AB
7.3 Rules and components for the transitions between lightning protection zones
Cables for ... Connection at the 0
S7-1500/ET 200MP/ET 200SP/ET 200AL
Inputs/outputs of BLITZDUCTOR® XT, base section BXT BAS
analog modules
BLITZDUCTOR® XT, module
(e.g., 4-20 mA,
(I
1-10 V)
– In continuous, surge current-carrying metal pipes that are grounded at both ends
– In reinforced concrete channels capable of carrying surge current with grounding at
both ends
– On closed metal cable racks that are grounded at the beginning and end
incorporation of metallic supply systems (for example, pipes, air ducts, cable channels or
cable ducts)
Lightning protection and overvoltage protection
interface to 1 with:
A
= 1.2 A) (4-wire)
L
to 1, 1 to 2, or 2 to 3
B
to 1, 1 to 2, or 2 to 3 prevents strong
B
to 1, 1 to 2, or 2 to 3:
B
Article
number
920 300
920 310
31