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6.1 Equipotential bonding for metal Every building must be equipped with a protective equipoten-
installations tial bonding system in accordance with the standards stated
above (Figure 6.1.1).
Equipotential bonding according to IEC 60364-4-41 Supplementary protective equipotential bonding is intended
(HD 60364-4-41) and IEC 60364-5-54 (HD 60364-5-54) for those cases where the conditions for disconnection of sup-
Equipotential bonding is required for all electrical consumer’s ply cannot be met or for special areas which conform to the
installations installed. Equipotential bonding according to the IEC 60364 series Part 7.
IEC 60364 series removes potential differences, in other words
it prevents hazardous touch voltages, for example, between Protective equipotential bonding
the protective conductor of the low-voltage consumer’s instal-
lation and metal water, gas and heating pipes. The following extraneous conductive parts must be directly
According to IEC 60364-4-41 (HD 60364-4-41), equipotential integrated in the protective equipotential bonding system:
bonding consists of protective equipotential bonding ¨ Protective bonding conductor in accordance with
and supplementary protective equipotential bond- IEC 60364-4-41 (HD 60364-4-41) (in the future: earthing
ing. conductor)

buried installation, functionally isolated (e.g. cathodically protected tank) metal element extend- ing through the entire building (e.g. lift rail) telecommunications system equipotential bonding system 230/400 V Main earthing busbar

Foundation earth
antenna of the bathroom kWh electrode
Connector
Lightning current
arrester
Connecting clamp
Pipe clamp
Terminal lug /
earthing conductor
to PEN Isolating spark gap

heating SEB

insulating joint gas water waste- distribution network
M

information technology system
water

M terminal lug for external
lightning protection system
foundation earth electrode /
lightning protection earth electrode

Figure 6.1.1 Principle of lightning equipotential bonding consisting of lightning and protective equipotential bonding

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