SMA SC 250U - Manual (Page 49)

SMA America, LLC 6 Electrical connection
Installation Guide DISU_SCUS-IA-IUS111711 49
AC connection Disconnect Unit for Sunny Central 500HE-US/CA/Sunny Central
CP
Figure 37: Overview AC connection to inverter - phases
Figure 38: Overview connection sequence AC switch to inverter
Arrangement of elements AC connection
To make sure that you can reach all nuts and screws with a torque-wrench, arrange all screw
terminals, screws, nuts, washers and spring washers as shown in the figures below.
A
B
C
3
2
1