SolarEdge SEK-I Series Installation Manual page 46

NOTE
Functional electrical earthing of DC-side negative or positive poles is prohibited
because the inverter has no transformer. Grounding (earth ground) of module
frames and mounting equipment of the PV array modules is acceptable.
7. Fasten the nut of the DC terminals with a torque of 4.2 ft.*lb.
NOTE
When using aluminum lugs, apply an electrical connection grease / material
on the base of the DC terminal to prevent oxidation of the lug contact area.
CAUTION!
Ensure that the Plus (+) wire is connected to the + terminal and that the Minus
(-) wire is connected to the Minus (-) terminal connector.
ATTENTION!
Veillez à ce que le câble Plus (+) soit connecté au terminal + et que le câble -
soit connecté au connecteur terminal.
NOTE
For systems with four PV strings per unit or more, fuses
may need to be installed in both the positive and negative
conductors as required by NEC Article 690.9. For more
information, refer to the "String Fusing Requirements
in SolarEdge Systems" technical note at
http://www.solaredge.com/files/pdfs/string_fusing_
requirements.pdf.
8. Close the Synergy Manager cover and secure it by tightening the six screws with a
torque of 2.6 ft.*lb.
9. Ensure proper conduit sealing; inspect the entire conduit run and use standard
conduit sealants to avoid water penetration.
CAUTION!
When installing a system with more than three strings per a single Synergy Unit
(whether connected directly or via a combiner box), fuses are required. In
SolarEdge system, 25A fuses must be used.
Three Phase Inverter with Synergy Technology P/N: SExxK-xxxxIxxxx SExxK-xxxxIxxxx
Chapter 4: Connecting AC and PV Strings to the Synergy Manager 45