Xantrex Technology PROsine 2.0 user manual 1Required AC Wire Size vs Breaker Rating, Breaker Size

Installation

AC Distribution	Most systems incorporate distribution centers both ahead of the PROsine (the AC
Panels	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.
	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.
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.

Table 3-1Required AC Wire Size vs Breaker Rating

	Breaker Size	10A	15A	20A	30A
	Minimum Wire Size	14AWG	14AWG	12AWG	10AWG
AC Output Neutral	The neutral conductor of the PROsine’s AC output circuit is automatically
Bonding	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.

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