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6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP3-6-3AV-40-BE-en-1224
Safety in accordance with IEC62109 when the grounding conductor
monitoring is deactivated
In order to guarantee safety in accordance with IEC62109 when the grounding conductor
monitoring is deactivated, you have to connect an additional grounding conductor to the
inverter.
Connect an additional grounding conductor that has an cross-section of at least 10mm
(see Section6.2.3, page25). This prevents touch current in the event of the grounding
conductor on the AC connector bush insert failing.
Connection of an additional grounding conductor
In some countries, an additional grounding conductor is generally required. In each case,
observe the locally applicable regulations.
If an additional grounding conductor is required, connect the one that has an cross-
section of at least 10mm (see Section6.2.3, page25). This prevents touch current in
the event of the grounding conductor on the AC connector bush insert failing.
6.2.2 Connecting the Inverter to the Utility Grid
Requirements:
The connection requirements of the grid operator must be met.
The grid voltage must be within the permissible range. The exact operating range of the
inverter is specified in the operating parameters.
Procedure:
1. Disconnect the circuit breaker and secure it against reconnection.
2. Dismantle the AC cable by 50mm.
3. Shorten L1, L2, L3 and N by 8mm each so that the grounding conductor is 8mm longer. This
ensures that the grounding conductor is the last to be pulled from the screw terminal in the
event of tensile strain.
4. Strip the insulation of L1, L2, L3, N and the grounding conductor by 12mm.
5. In the case of fine stranded wire, L1, L2, L3, N and the grounding conductor are to be fitted
with bootlace ferrules.
6. Assemble the AC connector and connect the conductor to the AC connector (see manual of
the AC connector).
7. Ensure that all conductors are securely connected to the AC connector.
8. Plug the AC connector into the jack for the AC
connection. When doing so, align the AC connector
so that the key on the inverter AC jack is inserted
into the keyway on the AC connector bush insert.
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