Page 3 - Doepke_5961002_diz2025_3_en_digital

No 3 | September 2025 DIZ | Doepke-INfo-ZeItuNg ––– page 3

Compliant protection for charging equipment

A growing number of electric cars and hybrid than 6 mA can also be produced when electric
vehicles are being driven on Germany’s roads. vehicles are being charged. This goes beyond
At the same time, the number of charging the design scope of conventional Type A or
facilities in public and private spaces is Type F residual current circuit-breakers. In
increasing. But whether it’s a private wallbox a worst-case scenario, these circuit-breakers
at home or a public charging point – ‘charging may fail as a result of the pre-magnetisation of
stations’ are usually used by people with no their summation current transformer, and this
expertise in electrical engineering and there- failure may go unnoticed. Protection against
fore need to be designed to be completely safe smooth DC residual currents must therefore
in order to avoid dangerous situations or even also be ensured. The standard IEC 62955 gives
electrical accidents. three options for this:
Safety standards for charging columns and The use of a Type B residual current device
wall boxes for electric vehicles are governed by is particularly suitable for new installations.
the installation regulations for electromobility For existing installations where a Type A or
charging devices, IEC 60364-7-722. Type F residual current device (or an unknown
According to these regulations, every plug protective device) is connected upstream, Another way to protect a charging station
against residual currents is to combine a
connection for charging an electric vehicle protection by a Type B device is not suitable. monitoring module for 6 mA DC detection
must be protected by its own residual current This is because it creates the risk of ‘blinding’
device (RCD) ≤ 30 mA of at least Type A. any upstream RCDs. with an additional Type A or Type F RCD.
When working with this particular combina-
However, smooth DC residual currents higher
tion, the person or company responsible for
the installation must, however, always carefully
follow the switch-off criteria required in the
event of a fault and be able to demonstrate that
they have done so in cases of doubt.

A third option is to use the Type A or Type F
DFS with EV functionality. These devices
detect smooth DC residual currents and trip at
6 mA DC, making them VDE-certified accord-
ing to the IEC 62955 standard. By using them,
you can prevent the summation current trans-
former core from becoming pre-magnetised.
This protection not only covers the RCDs used
here, but also extends to any upstream Type A
and Type F RCDs to ensure safe charging.

efa:ON trade fair
in Leipzig

From 23 to 25 September, Leipzig will host
efa:ON, the long-standing trade fair for electri-
cal, building and lighting technology in central
Germany and neighbouring regions. It com-
bines an exhibition, a specialist programme
and a special event, attracting numerous
visitors from the skilled trades, industrial,
commercial and energy supply companies,
retailers, planners, architects, engineers, build-
ing operators, investors and young industry
professionals to the exhibition halls.
Doepke will of course be there, presenting its
latest innovations and everything you need
to know about the safe use of electricity in
Hall 5 at Stand E 10. In addition, Stefan Davids
will speak at the de-Innovation Forum and
Holger Meier at the efaforum of the Saxony/
Thuringia guild. We look forward to seeing
new and familiar faces, engaging in interesting
discussions and gaining new inspiration.