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The AC wires inside the AC compartment are #16 AWG (1.3 mm
temperature rating of 105°C (221°F). All AC connections should be made
using an approved connector for your application (e.g., split bolt, twist-on
wire connectors, etc.). Ensure the wire connectors used are rated for the size
and number of wires you are connecting.
After connecting the wires together, gently pull the wires to ensure they are
securely held together. No bare wire should be exposed.
Info: Per UL certification, non-metallic sheathed cable (i.e.,
Romex™) or a SO fl exible cord with listed strain reliefs are allowed to
be used to connect to the inverter—no conduit connections allowed.
After all AC wiring in the inverter is complete—prior to re-attaching the AC
access cover—review all wiring to ensure connections are correct and secure.
2.6.3
AC Wire Size and Overcurrent Protection
The AC input and output wiring must be sized
safety code requirements
inverter's
maximum load current. After determining the proper AC wire sizes,
the inverter's AC input (unless you are using a fl exible cord) and output
wires are required to be protected against overcurrent and have a means to
disconnect the AC circuits.
Overcurrent protection must be provided by fuses or circuit breakers, and
must
be properly sized and rated for the wire they are protecting and the
appliances being powered.
An external disconnect device is required for both the AC input and AC output
wiring. Most inverter's that are hardwired use a service/distribution panel
wired to the inverter's input (main panel), and a dedicated panel between
the inverter's output wiring and the AC loads (sub-panel). These systems use
the circuit breakers provided in the panels as the overcurrent protection and
the AC disconnect. If fuses are used, then separate AC disconnect switches
will be needed.
Based on information from the NEC, Table 3 provides the minimum AC wire
size and the suggested breaker size based on the inverter model.
larger wire size may be required because of voltage drop. The
provided in this table assume using only copper wire and a temperature rating
of 75°C (167°F) or higher. A minimum of #14 AWG (2.1 mm
for all AC wiring.
Table 3, Minimum Wire Size to Circuit-breaker Size
Inverter
Input
Minimum
Model
Breaker
Wire Size
MM612
7 amps
(2.1 mm
MM1212
20 amps
(3.3 mm
© 2016 Sensata Technologies
to ensure the wire's ability to safely handle the
AC Input
Suggested
Breaker
Size
#14 AWG
10 amps
)
2
#12 AWG
20 amps
)
2
Installation
per the NEC and
local electrical
AC wire sizes
) is required
2
AC Output
Output
Minimum
Breaker
Wire Size
#14 AWG
8 amps
(2.1 mm
)
2
#14 AWG
12 amps
(2.1 mm
)
2
) with a
2
However,
Suggested
Breaker
Size
10 amps
15 amps
16
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