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6 Electrical Connection
6.3
AC Connection
6.3.1
Connecting the Utility Grid
AC cable requirements as follows:
☐ The maximum permitted temperature of the terminal block for AC connection of 105°C must
be observed.
☐ External diameter: 11 mm to 21 mm
☐ Conductor cross-section: 6 mm² (flexible/inflexible) or 10 mm² (inflexible)
☐ Insulation stripping length: 12 mm
☐ Sheath stripping length: 20 cm
☐ The cable must be dimensioned in accordance with the local and national directives for the
dimensioning of cables. The requirements for the minimum wire size derive from these
directives. Factors influencing cable dimensioning include nominal AC current, cable type,
routing method, cable bundling, ambient temperature and maximum desired line losses.
Residual-current monitoring unit:
For operation, the charging station requires an external residual-current device type A, which has a
rated residual current of 30 mA. Each charging station in the system must be connected to the utility
grid via a separate residual-current device and miniature circuit breaker. A DC residual-current
device of 6 mA is already integrated in the charging station.
Multi-EVC operation mode:
In multi-EVC operation mode, all charging stations must be connected to the utility grid on a rolling
basis (see Section 4.5.1, page 20).
A system with 3 three-phase charging stations must be connected to the utility grid on a rolling basis
as follows:
• Three-phase charging station 1: L1, L2, L3
• Three-phase charging station 2: L2, L3, L1
• Three-phase charging station 3: L3, L1, L2
For example, a system with 2 three-phase charging stations and 1 single-phase charging station
can be connected as follows:
• Three-phase charging station 1: L1, L2, L3
• Three-phase charging station 2: L2, L3, L1
• Single-phase charging station 3: L3
Procedure:
1. Turn off the miniature circuit breaker.
2. Dismantle the AC cable by 20 cm.
3. Strip 10 mm to 12 mm of the insulation from the insulated conductors.
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EVCxx-10-BE-en-11
SMA Solar Technology AG
Operating manual
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