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6 Electrical ConnectionSMA Solar Technology AG <br />Installation Manual SBxx-1SP-US-41-IA-xx-12 49 <br />Procedure: <br />1.DANGER <br />Danger to life due to high voltages <br />When exposed to sunlight, the PV array generates dangerous DC voltage which is present <br />in the DC conductors. Touching the DC conductors can lead to lethal electric shocks. <br />• If an external DC disconnecting switch is available, open the external DC <br />disconnecting switch. <br />• Ensure that the DC load-break switch on the inverter is in the O position. <br />• Ensure that there is no voltage on the DC inputs of the inverter. <br />2. Remove the adhesive tape from the enclosure opening for the DC connection and, if other <br />enclosure openings are to be used, take the sealing plugs out of these enclosure openings. <br />3. Insert the conduit fitting into the opening and tighten from the inside using the counter nut. <br />4. Attach the conduit to the conduit fitting. <br />5. Guide the conductors from the conduit into the inverter. In the process, lay the conductors in <br />the inverter such that they do not come into contact with the communication assembly. <br />6. Connect each equipment grounding conductor of the PV array to an equipment grounding <br />terminal: <br />• Strip the insulation of the equipment grounding conductor by 18 mm (0.71 in). <br />• Insert the screw through the spring washer, the clamping bracket and the washer. <br />• Guide the equipment grounding conductor <br />between the washer and clamping bracket and <br />tighten the screw (TX 25) (torque: 6 Nm ± <br />0.3 Nm (53.10 in-lb ± 2.65 in-lb)). Here, the <br />equipment grounding conductor must have <br />contact with an inner edge of the clamping <br />bracket. <br />• If two equipment grounding conductors are to <br />be connected to one equipment grounding <br />terminal, guide both equipment grounding <br />conductors between the washer and clamping <br />bracket and tighten the screw (TX 25, torque: <br />6 Nm ± 0.3 Nm (53.10 in-lb ± 2.65 in-lb)). <br />Here, every equipment grounding conductor <br />must have contact with an inner edge of the <br />clamping bracket. <br />7. Plug the terminal block for the DC connection into the DC-in slot in the inverter. <br />EN <br />G <br />L <br />I <br />S <br />H <br />534 S Sycamore St <br />- 10110979707/01/22