SMA STP 60-US-10 Installation - Manual (Page 26)

2 Installation SMA Solar Technology AG
26 STP60-10-IA-xx-10 Installation Guide
Figure 2.18 Cables with different conductors (from top to bottom):
single strand, multi strand, fine stand and extra-fine strand
The STP 60 inverter must only be connected to a
three-phase grid.
On the AC cable, strip insulation on all four wires. The
protective conductor (PE) must be longer than the grid wires.
See figure 2.17.
1. Verify that the nominal voltage of the inverter matches
the grid voltage.
2. Ensure that the main circuit breaker is released, and
take precautions to prevent reconnection.
3. Open the front cover.
4. Insert the cable through the AC cable gland to the
connecting terminal plate.
5. Connect the three grid wires (L1, L2, L3) and the
grounding conductor (PE) to the connecting terminal
plate with the respective markings. The grounding
conductor is marked with the symbol shown in figure
2.19.
6. Optional: Make an extra PE connection at the
secondary PE grounding points using the external
device grounding bolt delivered with the inverter. See
figure 5.2.
7. All wires must be properly fastened with the correct
torque. See Section 5.5, page 50.
Figure 2.19 Protective conductor symbol
2.7 Cable Entry
Options for cable entry
• For STP 60-10: cable glands (pre-mounted)
• For STP 60-10-US: two-inch conduit adapters (included
in delivery)
When replacing the two-inch conduit adapters, ensure to
tighten the screws in the order shown in figure 2.19 and
figure 2.20. First tighten all screws with 0.75 Nm and then
2.5 Nm.
Figure 2.20 AC mounting bracket
Figure 2.21 DC mounting bracket
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the
inverter properly can result in death or serious injury.
• Ensure the correct grounding of the devices by a
certified electrical installer.