SMA SC 250U - Manual (Page 18)

5 Installation of the Disconnect Unit SMA America, LLC
18 DISU_SCUS-IA-IUS111711 Installation Guide
5 Installation of the Disconnect Unit
5.1 Choosing the installation site
5.1.1 Ambient conditions
☐ The installation location must be accessible at all times.
☐ Ambient temperature: ‒13 °F … +122 °F (‒25 °C … +50 °C).
☐ Humidity 15 % … 95 %.
☐ The Disconnect Unit is not protected from salt fog pariculars, it can not be operated in
chemically aggressive environments. Operate the Disconnect Unit in a minimal distance of
19 miles (30 km) from sea.
For more information, see section 8 ”Technical data”, page 66.
5.1.2 Characteristics of the base
☐ The mounting surface is leveled and strong enough to support the weight of the Disconnect Unit.
The evenness of the foundation must be less than 0.25 % (1 in. per 3
5
⁄
16
ft.).
☐ The width and depth of the base is at least the same size as the Disconnect Unit including
mounting anchors.
Figure 4: Dimension Base for Disconnect Unit