Cross-sections must
be designed according IEC 62305.The main earthing rail must located the main
connection area close the building connections.
In each building, the earthing cable and the following
conductive parts must connected the protective
equipotential bonding via the main earthing rail:
• Metallic pipelines supply systems
• Extraneous conductive parts the building struc-
ture
• Metallic central heating and air-conditioning sys-
tems
• Protective conductors within the electrical system
• Metallic reinforcements building structures made
of reinforced concrete
The protective equipotential bonding cables must
meet the requirements IEC 60364-441/ IEC 60364-
5-54.
Requirement for equipotential
bonding:
• Must possible isolate con-
ductors
• Reliable connection
• Can only undone with tools
Bodies (electrical equipment)
Extraneous conductive part (C1, C2, C3, C6, C7)
Main earthing busbar
Foundation earth electrodes
Earth electrodes for lightning protection
Lightning protection system
Protective conductors (PE)
Protective equipotential bonding cable for connection
with the main earthing busbar
Protective equipotential bonding cable (for the addition-
al protective equipotential bonding)
Lightning protection down-conductor
Earthing conductor
Functional earthing conductors for lightning protection
Air-conditioning system
Heating
Metal (waste/drinking) water pipes bathroom
Equipotential bonding system building
TBS
Blitzschutz-Leitfaden
2018
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Chapter The internal lightning protection system
. the lightning protection equipotential bonding,
the cables the equipotential bonding must di-
mensioned for higher currents
