SMA SC 250U - Manual (Page 28)

5 Installation of the Disconnect Unit SMA America, LLC
28 DISU_SCUS-IA-IUS111711 Installation Guide
1. Determine the entering side of the cables. There are plates for cable entries on both sides and
at the bottom of the Disconnect Unit.
2. For every plate which is used for cable input
proceed as follows:
• Loosen all screws of the plate and remove the
plate.
4. Cut 1 additional opening for the PE cable on the side that points to the inverter.
• The openings must be large enough so that all cables can be pulled through.
• The openings must not be too large so that they can be sealed up easily.
5. Install the plates with openings at the Disconnect
Unit. Tighten the screws with a torque of 31 in-lb.
(3.5 Nm).
3. /05*$&
Danger of fire
In order to avoid high temperatures you must distribute the cables through a sufficient number
of openings.
Refer to National Electrical Code
®
ANSI/NFPA 70 requirements for further information.
Regard the AC cable arrangement requirements mentioned in section 6.4.2 for sufficient
number of openings.
• Cut openings into the plate.
• The opening must be large enough so that all cables can be pulled through.
• The opening must not be too large so that they can be sealed up easily.