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Electrical Connection
6.5.2 Connect the AC cable 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. Remove the screws on the fuse box cover.
4. Remove the fuse box cover toward the front.
5. Ensure that there is no voltage between the fuse output and the ground bar. Use a multimeter.
The voltage must be 0 V.
6. Break out a 1 in. (25.4 mm) knockout from the underside of the fuse box.
7. Lay a cable conduit from the fuse box to the DC Disconnect (see chapter 6.3 "Insert the cable
into the SMA DC Disconnect" (page 29)).
8. Place the cover back onto the fuse box.
9. Tighten the screws.
10. Open the DC Disconnect as described in section 8.3 "Opening SMA DC Disconnect"
(page 50).
11. Lead the AC cable through the cable conduit from the inside of the fuse box into the inside of
the DC Disconnect.
CAUTION
Ground faults, unreliable and resistive connections due to faulty wire nuts.
• Avoid using wire nuts to join any wires together or to make any connections
anywhere in the PV system.
12. Open the screw terminals completely by turning the screws counterclockwise with a flat-head
screwdriver.
13. Connect the AC equipment-ground wire (A) to the PE
terminal labeled
14. Connect the L1 (AC line 1) wire to the terminal
labeled L1 in the SMA DC Disconnect.
34
SB8-10TL-IUS103811
in the SMA DC Disconnect.
SMA America, LLC
Installation Guide
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