SMA Sunny Boy 3800U, Installation Manual

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SB3800U-12:SE2006 SMA America 5-5
Connecting the AC Wires
Use the following procedure to connect the AC wires to the SB3800U:
WARNING: You must connect the wires that carry the AC
voltage from the SB3800U to the utility grid in the order
described in this procedure. Deviating from this procedure
could expose you to lethal voltages that can cause serious
injury and/or death.
1. Turn OFF the main breaker in the main utility breaker panel.
2. Remove interior breaker panel cover.
3. If you are replacing an existing inverter, disconnect the wires for the AC line you
are working with in the breaker box.
4. Install a
3/4
-inch conduit fitting in the SB3800U’s AC wiring knockout (the
knockout on the right side of the SB3800U, as shown in Figure 5-1). Fasten the
conduit fitting on the inside of the SB3800U with the appropriate locknut.
5. Install
3/4
-inch conduit between the main breaker panel and the SB3800U’s AC
wiring knockout.
6. Pull the AC wires through the conduit from the interior of the breaker panel to the
interior of the SB3800U.
Note:
Refer to Figure 5-4 on page 5-7 for steps 7 through 10.
CAUTION: Avoid using wire nuts to join any wires together or
to make any connections anywhere in the PV system. Wire nuts
are a frequent cause of unreliable, resistive connections, and
ground faults.
7. Connect the AC equipment-ground wire to the terminal labeled PE in the
SB3800U.
8. Connect the L1 (AC line 1or HOT) wire to the terminal labeled L1 in the SB3800U.
9. Connect the L2 (AC line 2) and N (AC line N) wire to the terminal labeled L2 and
N in the SB3800U.
10. Connect the wires and tighten to a torque of 18 in-lb.
11. Verify that all connections are correctly wired and properly torqued.