Requirements for the AC Connection
Electrical installation
All electrical installations must be carried out according to the electrical requirements applicable on site.
- All work must be carried out in such a way that it complies with the technical standards for electrical devices and the regulations for electrical installation.
- All work must comply with the regulations on occupational safety and hygiene.
Cable requirements:
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External diameter: 14 mm to 25 mm
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Conductor cross-section: 6 mm² to 16 mm²
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Insulation stripping length: 12 mm
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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.
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The cable must be laid in a conduit.
Load-break switch and cable protection:
NOTICE
Damage to the inverter due to the use of screw-type fuses as load-break switches
Screw-type fuses (e.g. DIAZED fuse or NEOZED fuse) are not suitable as load-break switches.
- Do not use screw-type fuses as load-break switches.
- Use a load-break switch or a circuit breaker for load disconnection.
- In PV systems with multiple inverters, protect each inverter with a separate three-phase circuit breaker. Make sure to observe the maximum permissible fuse protection ( > Technical Data). This will prevent residual voltage being present at the corresponding cable after disconnection.
- Loads installed between the inverter and the circuit breaker must be fused separately.
Residual-current monitoring unit:
- If an external residual-current device is required, a device which trips at a residual current of 100 mA or higher has to be installed.