SMA Sunny Central 250U Installation Manual page 59

SMA America, LLC
2. Affix the label that indicates the grounded path of
the DC system to the front plate of the Disconnect
Unit.
There are 2 labels included in the scope of delivery
for indicating the grounded path of the DC system.
Depending on which path of the DC system is
grounded affix label for positive or negative
grounding to the front plate of the Disconnect Unit.
Installation Guide
6 Electrical connection
DisconACDC_SCUS-IUS103110 59