Chapter 3: Connecting the AC and the Strings
to the Connection Unit with Safety Switch
The Connection Unit with Safety Switch disconnects all ungrounded DC conductors of
the circuit to which it is connected in compliance with the National Electric Code, and
specifically NEC690.3, which addresses ungrounded PV arrays. The Connection Unit
with Safety Switch is rated to the maximum operating conditions of the inverter.
The following figure illustrates the Connection Unit with Safety Switch.
Figure 19: Inside the Connection Unit with Safety Switch
Grid Connection Guidelines
In single phase inverters connected to corner grounded grids, connect the L2
terminal to the grounded conductor. When connecting to other grids, L1 and L2 are
interchangeable.
The conduits, hubs and fittings must be suited for field wiring systems.
The hubs and other fittings must comply with UL514B.
Use the conduit and wiring appropriate for the installation location per the NEC.
Outdoor installations must use components that are rated NEMA 3R or higher.
EV Charging Single Phase Inverter Guide MAN-01-00588-1.1
38 Chapter 3: Connecting the AC and the Strings to the Connection Unit
with Safety Switch
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