SMA EV Charger 7.4 - AC Power Connection

6 Electrical Connection
SMA Solar Technology AG
Operating manual EVCxx-10-BE-en-10 27
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.
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.
4. Thread the AC cable through the cable gland into the product. If necessary, slightly loosen the
swivel nut.
5. For EVC22-3AC-10, connect the conductors L1, L2,
L3, N and grounding conductor according to the
labeling. For EVC7.4-1AC-10, connect the
conductors L1, N and grounding conductor
according to the labeling. Insert each conductor into
the corresponding terminal point.
L1
L2
L3
N
N
PE
EVC22-3AC-10
L1
L2
L3
N
N
PE
EVC7.4-1AC-10
6. Ensure that the terminal points are allocated to the correct conductors.
7. Tighten the swivel nut on the cable gland hand-tight.