6 Electrical Connection
SMA Solar Technology AG
Operating manual EVC22-3AC-20-BE-en-10 39
6 Electrical Connection
6.1 Requirements for the electrical connection
6.1.1 Permitted grid configurations
The charging station is approved for operation in the following utility grids:
• TN-C
• TN-S
• TN-C-S
• TT
• IT
• Delta-IT
See also "Compatibility between common grid configurations and SMA inverters and SMA
charging stations".
6.1.2 Residual-current monitoring unit
The charging station has an integrated DC residual-current device rated at 6 mA. The charging
station does not need any external residual-current device for operation. If local regulations require
the use of a residual-current device, the following must be observed:
☐ The charging station is compatible with residual-current devices of type A that have a rated
residual current of 30mA or higher. Each charging station in the system must be connected to
the utility grid via a separate residual-current device.
6.1.3 Load-break switch and cable protection
NOTICE
Damage to the charging station due to the use of screw-type fuses as load-
break switches
Screw-type fuses (e.g. DIAZED fuse or NEOZED fuse) are not load-break switches.
• Do not use screw-type fuses as load-break switches.
• Use a load-break switch or circuit breaker as a load disconnection unit (for information and
design examples, see the Technical Information "Miniature circuit breaker" at www.SMA-
Solar.com).
☐ In systems with multiple charging stations, protect each charging station with a separate circuit
breaker. Make sure to observe the maximum permissible fuse protection (see Section15,
page101). This will prevent residual voltage from being present at the corresponding cable
after disconnection.
☐ LoLoads installed between the charging station and the circuit breaker must be fused
separately.
☐ The overcurrent protective device for the AC output circuit is to be provided by others.
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