Grounding The Dc Disconnect - SMA SUNNY BOY 3000-US Installation Manual

SMA America, LLC
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.
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.
5. Insert 1 rain-tight or water-tight sleeve (
DC Disconnect and tighten from the inside using a counter nut.
6. Install 1 rigid conduit (
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
Position
A
B
Installation Manual
3
⁄
4
3
⁄ in. (19 mm)) in the enclosure opening.
4
Designation
PV ground terminal
DC ground terminal
in. (19 mm)) in the enclosure opening of the
6 Electrical Connection
SB30-40-US-IA-en-33 43