SMA America, LLC
Electrical Connection
Installation Guide
SB50US-80US-eng-IUS112633
43
AC Connection Terminals for 277 V
6.4.3 AC Wiring with SMA DC Disconnect
Connecting the AC cables in the DC Disconnect
1. Switch off the main switch in the main switchbox.
2. Remove the internal switchboard cover.
3. Install a
3
⁄
4
in. cable gland in the breakout opening for the AC cables of the SMA DC
Disconnect.
4. Between the main switchbox and the breakout opening for the AC cables of the SMA DC
Disconnect, install a
3
⁄
4
in. cable conduit.
5. Pull the AC cables from the switchbox through the cable conduit into the SMA DC Disconnect.
Item
Description
A
Conductor L1 connected to terminal L1
B
Conductor N connected to terminal N
C
Device grounding conductor connected to PE terminal
If you replace an existing inverter
• In the switchbox, disconnect the cables for the AC line on which you are working.
Open terminals fully before feeding through the cables.
