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©
2015 Sensata Technologies
2.0 Installation
2.5 AC
Wiring
This section provides information on how to make the AC connections to
the inverter using the correct AC wire size and corresponding overcurrent
protection.
2.5.1 Pre-AC Wiring Requirements
WARNING:
DO NOT connect the inverter’s output to an AC power
source. This could cause severe damage to the inverter and is not
covered under warranty.
CAUTION:
Before installing any AC wiring, review all safety
information in this manual to ensure a safe and long-lasting
system.
• Always use properly rated circuit breakers. If using an electrical sub-panel,
circuit breakers can be moved from the main electrical panel to the sub-
panel only if the breakers are also listed to be installed in the sub-panel.
• AC wiring must be copper wire and be approved for the application (i.e.,
residential, RV, or marine wiring).
• The wire sizes recommended in this manual are based on the ampacities
given in Table 310.16 (in conduit) or Table 310.17 (in free air) of the National
Electrical Code, ANSI/NFPA 70, for 75ºC (167ºF) copper wire based on an
ambient temperature of 30ºC (86ºF).
2.5.2 AC Wire Size and Overcurrent Protection
If wiring to the AC input and output terminals, the wiring must be sized per
the local electrical safety code requirements to ensure the wire’s ability to
safely handle the inverter’s maximum load current. The AC wiring must be
protected from short circuits and overloads by an overcurrent protection
device and have a means to disconnect the AC circuits. AC overcurrent
protection is not included in the inverter and must be provided as part of the
inverter installation. The AC overcurrent protection device must be a circuit
breaker or a fuse/disconnect and be properly sized and branch circuit rated
for the wire it is protecting and the appliances being powered.
If you need to supply more than 20A of current to the loads or if the
GFCI protection is not required, then wire to the L1/N1 output terminals.
When wired to the L1/N1 output terminals, the pass-thru capacity of the
CSW2012-X is limited by the internal transfer relay contacts, which is 30A
(3000W) maximum for resistive loads (lower for inductive loads such as
electric motors, etc.). For a 30-amp pass-thru capability, a 30-amp branch
rated circuit breaker is required on the AC input, which corresponds to a
minimum cable size of #10 AWG (5.3 mm
2
).
If wiring to the L2/N2 output terminals (GFCI protected), the pass-thru
capacity of the CSW2012-X inverter is limited to 20 amps (2400W) maximum
by a supplementary breaker inside the inverter. For a 20-amp pass-thru
capability, a minimum cable size of #12 AWG (3.3 mm
2
) is recommended.
Note: The AC 2 (L2/N2) output terminals are connected to the load side of
the GFCI receptacle, and are under the influence of the receptacle’s “Test”
and “Reset” buttons.