If an external RCD is required by local regulations, check which type of RCD is required
for the relevant electric code. Install the residual-current device (RCD) in accordance
with the applicable local standards and directives. SolarEdge recommends using a type-
A RCD. The recommended RCD value is 100 mA or 300 mA unless a lower value is
required by the specific local electric codes. For extended power three phase inverters
(SE25K, SE27.6K and SE33.3K) an RCD value of 300 mA should be used. When required
by local regulations, the use of an RCD type B is permitted.
NOTE
For multiple inverters, an RCD per inverter is required.
In installations where the local electric code requires an RCD with a lower leakage
setting, the discharge current might result in nuisance tripping of the external RCD. The
following steps are recommended to avoid nuisance tripping of the external RCD:
Select the appropriate RCD for correct operation of the installation: An RCD with
a rating of 30 mA may actually trip at a leakage as low as 15 mA (according to
IEC 61008). High quality RCDs will typically trip at a value closer to their rating.
Configure the trip voltage of the inverter's internal RCD to a lower value than
the trip current of the external RCD. The internal RCD will trip if the current is
higher than the allowed current, but because the internal inverter RCD
automatically resets when the residual currents are low it saves the manual
reset.
For detailed information, refer to the
RCD Selection for SolarEdge
Inverters Application Note
, available on the SolarEdge website at
http://www.solaredge.com/sites/default/files/application_note_ground_fault_
rcd.pdf.
Chapter 4: Connecting the AC and the Strings to the Inverter 35
Three Phase System Installation Guide MAN-01-00057-4.1
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