Sma SB 6000TL‑US Installation User Manual download pdf (Page 35)

SMA America, LLC 5 Electrical Connection

Installation Manual SB6-11TL-US-IA-en-13 35

Load Disconnection Unit

Install a separate miniature circuit-breaker for each inverter, in order that the inverter can be safely

disconnected under load. See the technical data (11"Technical Data",page70) for the maximum

permissible rating.

5.4.1 Connecting the AC Cables in the DC Disconnect

1. Open all AC and DC circuit breakers or load-disconnecting switches.

2. Open the main fuse in the fuse box.

3. Ensure that there is no voltage between the fuse output and the ground bar. Use a multimeter.

The voltage must be 0 V.

4. Open the DC disconnect as described in section 8.3"Opening the DC Disconnect",page58.

5. Remove a suitable knockout opening on the bottom side of the DC disconnect.

6. Lay a cable conduit from the fuse box to the DC disconnect (see chapter 5.2"Inserting the

Cables in the DC Disconnect",page31).

7. Lead the AC cable through the cable conduit from the inside of the fuse box into the inside of

the DC Disconnect.

Screw-type fuse elements as load disconnection unit

The Sunny Boy can be damaged during isolation under load.

• Use a miniature circuit-breaker or listed switch-disconnector as load disconnection unit.

• Do not use a screw-type fuse element as switch-disconnector.

Open terminals fully before insertion of the cables.

8. Connect the AC device grounding conductor to the

PE terminal labeled in the DC Disconnect.

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Sma SB 6000TL‑US Installation User Manual Page 35