SMA America, LLC 6 Electrical Connection
Installation Manual SB30-40-US-IA-en-33 43
1. Disconnect the AC miniature circuit-breaker and ensure that it cannot be reconnected.
2. Open the DC Disconnect (see Section 9.3).
3. Break out a suitable knockout on the underside of the DC Disconnect for inserting the DC cable
of the PV array.
5. Insert 1 rain-tight or water-tight sleeve (
3
⁄
4
in. (19 mm)) in the enclosure opening of the
DC Disconnect and tighten from the inside using a counter nut.
6. Install 1 rigid conduit (
3
⁄
4
in. (19 mm)) in the enclosure opening.
7. Insert the DC cables of the PV array into the interior of the DC Disconnect through a rigid
conduit.
6.4.2 Grounding the DC Disconnect
The PV protective conductor on the frame of the PV array must be connected to the PV ground
terminal. The cross-Section of the PV protective conductor corresponds to the cross-Section of the
largest conductor in the DC system.
A DC grounding conductor may be required by the Authority Having Jurisdiction (AHJ).
Figure 17: Connecting terminal plate for connecting the protective conductor
4.
Damage to the DC Disconnect due to penetration of moisture
Electronic components in the inverter can be destroyed or damaged as a result of moisture
penetration.
• Only break out 1 knockout for the connection of the DC cable.
• Do not enlarge the enclosure opening.
Position Designation
A PV ground terminal
B DC ground terminal
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