6 Electrical Connection SMA Solar Technology AG
34 SB30-50TL-21-IA-en-21 Installation Manual
Connection of a second protective conductor
The inverter is equipped with a protective conductor monitoring device. This protective conductor
monitoring device detects when there is no protective conductor connected and disconnects the
inverter from the electricity grid if this is the case. Depending on the installation site and earthing
system, it may be advisable to deactivate the protective conductor monitoring. This would apply, for
instance, if there is no neutral conductor and you intend to install the inverter between two line
conductors. If you are uncertain about this, ask your network operator or SMA Solar Technology AG
to advise.
• Depending on the earthing system, deactivate the protective conductor monitoring device
(see Section 7.4).
• To ensure safety in accordance with IEC 62109 when the protective conductor monitoring is
deactivated, connect a protective conductor to the connecting terminal plate for the AC cable
(minimum cross-section: 10 mm², copper wire).
or
• Connect a second protective conductor with the same cross-section as the original protective
conductor (see Section6.3.3 "Additional Earthing of the Enclosure", page39). This will prevent
touch current if the original protective conductor fails.
Load disconnection unit
You must install a separate miniature circuit-breaker for each inverter in order to ensure that the
inverter can be securely disconnected under load. For information on the maximum permissible fuse
protection, refer to the Technical Data (see Section 14).
You will find detailed information and examples for dimensioning of miniature circuit-breakers in the
Technical Information "Miniature Circuit-Breaker" at www.SMA-Solar.com.
Connection of a Second Protective Conductor
In some countries a second protective conductor is required as a matter of principle. In each
case, observe the applicable regulations for the site.
Attach the warning labels on the load disconnect unit on the AC side
To prevent arcing, always disconnect the inverter from the AC and DC side before starting
work on the PV array.
Attach the warning label "Risk of burns from electric arc" so that it is clearly visible on the
external AC disconnection device.
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