Magnum Energy MM612 Inverter - Manual (Page 24)

©
2010 Magnum Energy, Inc.
2.0 Installation
18
The AC wires inside the AC compartment are #16 AWG with a tem-
perature rating of 105° C, 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 on the wires to ensure
they are securely held together. In a proper connection, no bare wire
should be exposed .
Info: Per UL certifi cation, 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; conduit
connections are not allowed.
AC Wire Size and Overcurrent Protection
The AC input and output wiring must be sized per the NEC and lo-
cal electrical safety code requirements to ensure the wire’s ability to
safely handle the 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/distri-
bution panel wired to the inverter’s input (main panel), and a dedicat-
ed 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 4 provides the minimum AC
wire size and the suggested breaker size based on the inverter model.
H owever, larger wire size may be required because of voltage drop.
The AC wire sizes provided in this table assume using only copper wire
and a temperature rating of 75° C or higher. A minimum of #14 AWG
is required for all AC wiring.
After all AC wiring in the inverter is complete — prior to reattaching
the AC access cover — review all wiring to ensure all connections are
correct and secure.
Table 4, Minimum Wire Size to Circuit-breaker Size
Inverter
Model
AC Input AC Output
Input
Breaker
Minimum
Wire Size
Suggested
Breaker Size
Output
Breaker
Minimum
Wire Size
Suggested
Breaker Size
MM612 7 amps #14 AWG 10 amps 8 amps #14 AWG 10 amps
MM1212 20 amps #12 AWG 20 amps 12 amps #14 AWG 15 amps