Chapter 4: Connecting The Ac And Dc Strings To The Connection Unit; Connecting The Ac Grid To The Connection Unit; Connecting The Ac Grid And Grounding To The Connection Unit - SolarEdge SE66.6KUS Installation Manual

Chapter 4: Connecting the AC and DC Strings
to the Connection Unit
The Safety Switch in the Connection Unit disconnects all ungrounded DC conductors i n compliance with
the National Electric Code (NEC; Specifically NEC690.35, which addresses ungrounded PV arrays). The
Connection Unit is rated to the maximum operating conditions of the inverter.
Inverters of different models might be equipped with different sizes/ types of terminal blocks.
NOTE
If connecting to a Delta Grid perform the 'To set the inverter for 208V delta grid connection' procedure
as described in Setting the Inverter to Support 208V 3-wire Grid on page 41, before connecting the AC
and strings to the Connection Unit.
Connecting the AC Grid to the Connection Unit
NOTE
SolarEdge's fixed input voltage architecture enables the parallel strings to be of different lengths.
Therefore, they do not need to have the same number of power optimisers, as long as the length of
each string is within the permitted range.
NOTE
It is recommended to connect communication connections (Setting Up Communication on page 57)
before connecting the AC, for easier access to the communication board.
Connecting the AC Grid and Grounding to the
Connection Unit
This section describes how to connect the AC grid and grounding to the C onnection Unit .
NOTE
If opposite polarity DC Conductors are routed in the same conduit for 480V inverters, use 1000 rated
cables and for 208V inverters use 600VDC rated cables.
-Three Phase Inverter with Synergy Technology Installation MAN-01-00402-1.4

Chapter 4: Connecting the AC and DC Strings to the Connection Unit

Figure 29: Inside the Connection Unit
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