11.
Danger of crushing when locking levers snap shut
The locking levers close by snapping down fast and hard.
• Press the locking levers of the connecting terminal plate for the AC cable down with your
thumb only.
• Do not grip the entire connecting terminal plate for the AC cable.
• Do not place your fingers under the locking levers.
12. Connect PE, N, L1, L2 and L3 according to the labeling to the connecting terminal plate for the
AC cable and push the safety levers down. The direction of the rotating magnetic field of L1,
L2 and L3 is not relevant.
13. Make sure that all conductors are securely in place.
14. Tighten the swivel nut of the cable gland.
6.3.3
Connecting Additional Grounding
If additional grounding or equipotential bonding is required locally, you can connect additional
grounding to the inverter. This prevents touch current if the grounding conductor at the connecting
terminal plate for the AC cable fails. The required clamping bracket, the screw and the conical
spring washer are part of the scope of delivery of the inverter.
Cable requirement:
Use of fine-stranded conductors
You can use an inflexible or a flexible, fine-stranded conductor.
• When using a fine-stranded conductor, it has to be double crimped by a ring terminal lug.
Make sure that no insulated conductor is visible when pulling or bending. This will ensure
sufficient strain relief by means of the ring terminal lug.
☐ Grounding cable cross-section: max. 16 mm²
Procedure:
1. Strip the grounding cable insulation.
2. Lead the clamping bracket over the grounding
cable. Arrange the grounding cable on the left-
hand side.
6 Electrical Connection
SMA Solar Technology AG
Operating Manual
27
STP20-25TL-BE-en-11
