Conductor And Cable Diameter - ABB Terra 54 Series Installation Manual

• The AC charging section of the charger has a RCD type B earth leakage protection.
This protection is required to protect the person using the system from earth leak-
ages, even while the onboard charger of the connected vehicle, independent from the
charger functionality, is causing DC currents in the AC-path towards the main switch
of the charger or site distribution panel.
• Because of this Type B protection on the AC-side of the cabinet, most local installa-
tion procedures also prescribes a Type B RCD upstream if an upstream RCD is re-
quired. Your installation company is required to verify this requirement.
DC-charging side requires immunity for short current peaks over PE
When the charger engages the DC charging (at the beginning of every charger session in the
pre-charge phase) a relay switches and turns on the input to the power modules. Asynchronic
engagement of the phases in the relay in combination with the electrical capacity in the input
power part, can cause incidental very short (25 microseconds) current peaks of up to 60A
over the Protective Earth. The amplitude of the Ampere peaks can vary with the location and
is dependent on grid and earth impedance. Given the switching characteristics of the DC sec-
tion of the charger we give you the advice to select an RCD that has proven to be able to with-
stand these short current peaks (high immunity). As a suggestion to the installation company
ABB recommends the following RCD type which will work in most grid situations: (1) ABB
make F204 B S-125/0,3 code: 2CSF204823R3950. It is the responsibility of your installation
company to select the right device.
Local regulation could require a Type B upstream RCD independent of AC-charging func-
tionality
The design of the power section is such that a DC current over 6mA does NOT occur on the
AC-input side of the power section during normal operation. It is up to the local authorities to
determine if whether these fault conditions qualify as independent single fault conditions
and therefor require a Type B RCD.
2.3.2

Conductor and cable diameter

The diameter of the electrical conductor of the ground cables depends on the length, method
of installation, etc. This must be determined by your contractor.
The phases and neutral are to be mounted with cable lugs M8 (not included in delivery) on the
mains isolator. The maximum conductor surface is 95 mm2.
The maximum diameter of the (grid) cable entering the cabinet is 45 mm. The minimum di-
ameter with the standard fitted cable gland insert is 34 mm.
2 0 18 - 10 - 03
CAUTION
Responsibility to comply with local regulations
The installation company is responsibly to design and install
the electrical installation according the local regulations.
TER R A 54 / 54 H V C H AR G ER
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