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4.1 Electrical Connections
The design intent of the PV Grid-tied Inverter and Integrated AC/DC
Disconnect unit is to provide a safe method of connecting the inverter to
the PV system array and the utility service source circuits. The AC/DC
Disconnect provides a single location for terminating AC, DC and ground
conductors.
In addition, the AC/DC Disconnect provides the following:
• An AC/DC ON/OFF disconnect switch to the PV array and the utility
service, and functions as a wire raceway.
• Is shipped with the inverter as an integrated assembly, housed indi-
vidually: an inverter and a disconnect.
• Allows an inverter to be removed for service while leaving the discon-
nect in place.
!
CAUTION
All electrical installations should be completed in accordance
with local electrical codes. The National Electrical Code (NEC)
requires that the inverter be connected to a dedicated circuit with
no other outlets or devices connected to the same circuit. See
NEC Section 690-64(b)(1). The NEC also places limitations on
the size of the inverter and the manner in which it is connected
to the utility grid. See NEC Section 690-64(b)(2). Please refer
to CSA 22.1 or your applicable electrical code if this product is
installed outside the United States.
To reduce the risk of fire, connect the inverter to the appropriate
size breaker (see Table 4-2 for required branch circuit
protection). Maximum branch-circuit over-current protection
is calculated in accordance with the National Electrical Code
(NEC), ANSI/NFPA 70, CSA 22.1 or applicable local electrical
codes.
When exposed to light, photovoltaic (PV) arrays create
electrical energy that cause a hazardous condition. To avoid
this, completely cover the surface of all PV arrays with opaque
material before wiring them.
Only qualified electricians should make the connection between
the AC/DC Disconnect and the utility grid. The
AC/DC Disconnect contains no user-serviceable parts. Refer
maintenance to qualified service personnel.
4. Wiring Requirements
WIRING
REQUIREMENTS
