SMA SC 250U - Manual (Page 41)

SMA America, LLC 6 Electrical connection
Installation Guide DISU_SCUS-IA-IUS111711 41
6.4.2 Arranging AC cables
This section explains how to arrange the AC cables to minimize the interferences between the different
phases. Make sure that the cables of the different phases have got the same length.
Cable arragement for AC cables shorter than 6
1
⁄
2
ft. (2 m)
Arrange the cables as shown in the following figure for all number of cables with length shorter than
6 1⁄2 ft. (2 m). The description is exemplary for an arrangement with 4 cables per phase. The
distance between the cables should be twice the diameter of a single cable.
Figure 20: Cable arragement for AC cables shorter than 6
1
⁄
2
ft. (2 m)
Cable arragement for AC cables longer than 6
1
⁄
2
ft. (2 m)
Arrange the cables as shown in the following figure for all number of cables with length shorter than
6 1⁄2 ft. (2 m). The description is exemplary for an arrangement with 4 cables per phase.
For AC cable arrangement 1: the distance between the cables should be twice the diameter of a
single cable.
Figure 21: AC cable arrangement 1
/05*$&
The AC cable length between Disconnect Unit and transformer must be lower than 49 ft (15 m).
Number of cables
per phase 3 4 5 6
AC cable
arrangement 1. If possible:
AC cable
arrangement 2.
else:
AC cable
arrangement 1 AC cable
arrangement 1. If possible: AC
cable
arrangement 3.
else:
AC cable
arrangement 1.