Electrical connection SMA America, LLC
50 SB30-40US-IUS103030 Installation Guide
6.7.4 DC wiring with SMA DC Disconnect
1. Verify that the AC breaker is OFF.
2. Install a
3
⁄
4
in. conduit fitting in the SMA DC Disconnect’s DC wiring knockout (the knockout on
the left side of the SMA DC Disconnect). Fasten the conduit fitting on the inside of the SMA DC
Disconnect with the appropriate locknut.
3. Install
3
⁄
4
in. conduit between the SMA DC Disconnect and the PV array.
4. Pull the DC wires, the ground wires from the PV array and the grounding electrode wire through
the conduit into the interior of the SMA DC Disconnect.
The SMA DC Disconnect has provisions for up to four PV strings. The PV UNGROUNDED
and PV GROUNDED terminal block each has four positions, so four pairs of DC-input wires
can be connected in parallel.
5. Connect the grounding electrode to the grounding
electrode conductor terminal (B).
6. Connect the PV generator grounding to the grounding
electrode conductor terminal (A).
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