5. Electrical Connections
37
CAUTION
The PV string 1 and the PV string 2 must be each connected to the
distribution box terminals, 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.
5.6.1 AC Circuit Breaker and DC Isolator
The circuit breaker populated on the distribution board varies depending on the installer.
Follow the installation standards to install a circuit breaker satisfying the voltage, the current
specification of the Grid and the PV. The cables presented in the [Table 5-5] are
recommended for use.
Item
Standard
Short circuit current rating
AC circuit breaker
230 Vac / 63 A
10 kA minimum
DC isolator
650 Vdc / 15 A or more
-
Item
Area
Insulation
Color code
Grid/Load (L, N)
6 mm
2
600 V or more
Black
PE
6 mm
2
600 V or more
Green with yellow lines
PV (+), (-)
6 mm
2
700 V or more
Black
[Table 5-5: Circuit breaker, DC Isolator and power line specification]
As illustrated in the [Figure 5-16], the distribution box connection diagram, the connection
between the All in One system and the distribution box is made to the terminals of the solar
energy (,PVdso1-,, and PVdso2-) of PV1+, PV1-, PV2+, and PV2-.
On one hand, the main body terminals (PV1 +, PV1 -, PV2+, PV2-) and the distribution box
terminals are connected in proper order. On the other hand, for the lines coming from the
GRID, L and N leads are connected to the distribution board (LG, NG). The lines coming out
from the LGO, PGO of the distribution board are connected to the L and N terminals of the
All in One System.
5.6.2 RCD (residual current device) Leakage Circuit Breaker
This product can cause a DC current in the external protective earthling conductor. Where a
residual current-operated protective (RCD) or monitoring (RCM) device is used for protection
in case of direct or indirect contact, either an RCD or RCM of Type B is only available on the
supply side of this product.
ITEM
Description
Type B
Type B devices, which detect
residual currents comprising of
pure AC, rectified AC and pure DC
[Table 5-6: RCD Leakage circuit breaker description]
