Siemens SIMATIC ET 200AL - Page 1578

Lightning protection and overvoltage protection
7.3 Rules and components for the transitions between lightning protection zones
Designing interference-free controllers
30 Function Manual, 06/2014, A5E03461486-AB
Rule for transition from lightning protection zone 0
A
to 1
Lightning protection equipotential bonding is required at the transition from lightning
protection zone 0
A
to 1. The following applies to the transition at the interface of lightning
protection zone 0
A
to 1:
● Use of lightning arresters prevents introduction of partial lightning currents into structural
systems
● Creation of local equipotential bonding at the transition of lightning protection zones, with
incorporation of metallic supply systems (for example, pipes, air ducts, cable channels or
cable ducts)
Components for lightning protection equipotential bonding from lightning protection zone 0
A
to 1
The following table shows components for lightning protection equipotential bonding from
lightning protection zone 0
A
to 1.
Table 7- 2 Components for transition from lightning protection zone 0
A
to 1
Seq.
no.
Cables for ...
Connection at the 0
A
interface to 1 with:
S7-1500/ET 200MP/ET 200SP/ET 200AL
Article
number
1 Three-phase
TN-C system
DEHNventil® DV M TNC 255
951 300
DEHNventil® DV M TNC 255 FM *
951 305 *
2 Three-phase
TN-S system
DEHNventil® DV M TNS 255
951 400
DEHNventil® DV M TNS 255 FM *
951 405 *
3 Three-phase
TT system
DEHNventil® DV M TT 255
951 310
DEHNventil® DV M TT 255 FM *
951 315 *
4 AC
TN-S system
DEHNventil® DV M TN 255
951 200
DEHNventil® DV M TN 255 FM *
951 205 *
5 AC
TT system
DEHNventil® DV M TT 2P 255
951 110
DEHNventil® DV M TT 2P 255 FM *
951 115 *
6 Supply
U
N
= 24 V DC
BLITZDUCTOR® XT, base section BXT BAS
920 300
BLITZDUCTOR® XT, module BXT ML2 B 180
(I
L
= 1.2 A) (2-wire)
920 211
7 Supply
U
N
= 24 V DC
DEHNbloc® M, DB M 1 150
961 110
DEHNbloc® M, DB M 1 150 FM *
(2 pieces required)
961 115 *
8 Bus cable
MPI RS 485,
RS 232 (V.24)
BLITZDUCTOR® XT, base section BXT BAS
920 300
BLITZDUCTOR® XT, module BXT ML2 B 180 (2-wire) 920 211
9 Inputs/outputs of
digital modules
U
N
= 24 V DC
BLITZDUCTOR® XT, base section BXT BAS
920 300
BLITZDUCTOR® XT, module BXT ML4 B 180
(I
L
= 1.2 A) (4-wire)
920 310
10 Inputs/outputs of
digital modules
U
N
= 230 V AC
DEHNbloc® M, DB M 1 255
961 120
DEHNbloc® M, DB M 1 255 *
(2 pieces required)
961 125 *