SMA SSM-U-1615 - Manual (Page 34)

6.3.4.3 Connecting Copper Cables to V-Box Terminal
Risk of fire from contact failure
Grease on the set screw can result in failure to reach the prescribed torque. Contact failure and
increased transition resistances are the result. This can cause components to overheat and catch
fire.
• Insert the insulated conductors into the box terminal from below. Ensure that no grease
comes into contact with the set screw.
Procedure:
1. Ensure that the DC subdistribution is switched off and secured against reconnection (see
Section 8 "Disconnecting and Reconnecting", page 46).
2. Ensure that the inverter is fully disconnected from voltage sources on the DC side and secured
against reconnection (see inverter manual).
3. Unscrew the set screw of the box terminal with an Allen key.
4. If you are using a cable with cable cross-section 185 mm
2 to 300 mm 2 , remove the insert in
the box terminal and reinsert it the other way round. The insert on the box terminal has a small
and a large clamping area. The insert must be reinserted so that the side for the larger
clamping area points towards the DC main cable to be clamped.
5. Lead the DC main cables into the DC subdistribution through the designated enclosure
openings (see Section 6.1, page 25) with the appropriate seal insert (see Section 12.1, page
62). Ensure correct polarity.
6. Strip the DC main cables by 35 mm.
7. Connect one DC main cable to each box terminal. To do this, insert the conductors into the
box terminal from below and fasten the set screw of the box terminal (torque: 32 Nm).
8. Ensure that the DC main cables are securely attached.
9. Secure the DC main cables to the external cable support rail.
6 Installation SMA Solar Technology AG
Operating Manual SSMUXX15-BE-en-10 34