External Residual-Current Device - ABB Terra 94 Installation Manual

Description
2.6

External residual-current device

The manufacturer does not supply an external residual-current device. If an external
residual-current device is required because of local rules, this section helps you to
select the correct device.
Situation: the local rules require an immunity for short current peaks over PE
during the EV charging process
At the start of the EV charge cycle, a relay switches and engages the AC input power
to the power modules. Incidental current peaks can occur. For the specifications of
the current peaks, refer to section
A combination of these factors is the source of these current peaks:
• Asynchronous engagement of the phases in the relay
• The electrical capacity of the AC input power part of the EVSE
The amplitude of the current peaks can change. These factors are the source of the
differences:
• The location of the EVSE
• The power grid
• The earth impedance
18
8.15
.
BCM.S1102.0-EN | 001