II - DCE FEL ČVUT v Praze

Main equipotential
bonding
Additional
equipotential
bonding
380 V
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
This interconnects the following conductive elements by the EB conductor
on the EB bus: APA = 0.5 x APE-main
– Main PE conductor
– Main ground conductor
– Earth termination
– Main water pipes
– Main gas pipes
– Other metal piping systems
– Metal structural elements of the building (if possible)
– Power and information system cables extending beyond the building,
via lightning conductor.
This interconnects the following conductive elements by the EB conductor
on the EB bus:
– All ”extraneous conductive elements” such as structural elements,
supports, containers, piping (these themselfs can form EB conductors),
APA = 0.5 x APEmax (A = cable cross section) from the distrib. board.
– Elements of stationary electrical apparatus which are accessible to
simultaneous contact when it is connected to PEN (otherwise a
PE connection is sufficient), APA = 0.5 x APE of both items of
apparatus.
Power supply cabinet Equipment cabinet Equipment cabinet Equipment cabinet
with Ex modules with Ex modules
PE bus
16 mm 2
L1
L2
L3
N
PE
Green/
yellow
To EB switchroom
Mechanical Configuration of an Automation System with SIMATIC S7 Ex Modules
PE bus
10 mm 2 10 mm 2 10 mm 2
16 mm 2
Equipotential bonding (EB)
bus
PE bus
10 mm 2
Fig. 1-10 Example of equipotential bonding for measurement and control systems
16 mm 2
PE bus
Structural elements,
containers, piping
10 mm 2
10 mm 2
1-15