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AC Distribution
Panels
Most systems incorporate distribution centers both ahead of the PROsine (the AC
source panel) and between the PROsine and the loads (the AC load panel). A
source panel includes a main circuit breaker, which serves as over-current
protection and as a disconnect for the AC shorepower supply line. Additional
circuit breakers serve individual circuits, one of which serves the PROsine. The
AC load panel can incorporate both the main 30A AC output circuit breaker and
breakers for individual load circuits.
AC Cabling AC cabling includes all the wires and connectors between the AC source and the
PROsine and all cabling between the PROsine and the AC panels, circuit
breakers, and loads. The type and size of the wiring varies with the installation
and load. For marine and some RV applications, flexible multiple-strand wire is
required. For residential installations, solid Romex™ cable is often used.
Installation codes may specify solid or stranded, overall size of the conductors,
and type and temperature rating of the insulation around the wire.
AC wiring must be sized to match the current rating of the AC breakers you
provide on the input and output AC circuits in accordance with the electrical
codes or regulations applicable to your installation. Table 3-1 is based on the U.S.
National Electrical Code and the Canadian Electrical Code, assuming 2-
conductor-plus-ground cable. Other codes and regulations may be applicable to
your installation.
AC Output Neutral
Bonding
The neutral conductor of the PROsine’s AC output circuit is automatically
connected to the safety ground during inverter operation. When AC utility power
is present and the PROsine is in Charger mode, this connection is not present, so
that the utility neutral is only connected to ground at your source panel. This
conforms to National Electrical Code requirements that separately derived AC
sources (such as inverters and generators) have their neutral conductors tied to
ground in the same way that the neutral conductor from the utility is tied to ground
at the AC source panel.
Important:
Do not connect the output of a single PROsine to what is known as a
“multi-wire branch circuit”. These are 4-wire circuits consisting of a ground, neutral, and
two lines that are 180 degrees out of phase with each other (from a standard 120/240V
“split phase” circuit). These circuits are commonly used in kitchens to power “split
receptacles” where the top and bottom halves of a duplex receptacle are connected to
different lines. If you need to run multi-wire branch circuits from your inverter system,
you will need to use two PROsine units in a series system to create 120/240Vac split-phase
power. For details, see Chapter 7, “Series Operation”. For more information about multi-
wire branch circuits, refer to the US National Electrical Code (NFPA 70, 1999) para 210–
4 and the Canadian Electrical Code (CSA C22.1-1998) section 26–710.
Table 3-1
Required AC Wire Size vs Breaker Rating
Breaker Size
10A 15A 20A 30A
Minimum Wire Size
14AWG 14AWG 12AWG 10AWG