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5.7 A Method of Locking the Distribution Box
(Board)
The distribution board performs the following functions when it is connected to the
INVERTER, the PV and the Grid.
AC Grid block function (external) AC circuit breaker
: 230Vac, 32A, 10kA (short circuit current rating)
DC block function; DC disconnect switch must be fitted.
PV String1 block function (external) DC disconnect switch
PV String2 block function (external) DC disconnect switch
: 650Vdc or more / 15A or more
Residual current device (RCD): Leakage current measure and block
The [Figure 5-17] shows the connection diagram on the distribution board. The distribution
box receives the DC input (the PV string 1 and the PV string 2) from the solar energy module.
The power grid and the house load are connected to the AC power (L, N).
Australia (Eng.) 05/2015. Rev1.1
[Figure 5-17: Distribution box connection diagram]
CAUTION
The PV string 1 and the PV string 2 must be each connected to the
distribution box terminal, as shown in the distribution board connection
diagram. Make sure that the string numbers match correctly. For example, do
not connect a PV string 1 to a PV string 2.
5. Electrical Connections
35
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