Magnum Energy MM-AE Series - Manual (Page 23)

©
2010 Magnum Energy, Inc.
Neutral to Safety Ground Bonding
The NEC (National Electric Code) provides the standards for safely
wiring AE (house, cabin, or offi ce) installations in the United States.
These wiring standards require the AC source (inverter, utility power,
or a generator) to have the neutral conductor tied to ground. These
standards also require that the AC neutral be connected to safety
ground (often called a “bond”) in only one place at any time. If more
than one bond is established, currents can circulate between neutral
and ground and cause ground-loop currents. These “ground-loops”
can trip GFCIs and cause an electric shock hazard. In AE installations,
the neutrals are connected together and are always connected to
safety ground at the main AC panel – never at the inverter.
Info: For an AE application, you must use an MM-AE
Series inverter/charger. Non “AE” versions are designed
for use in mobile applications.
AC Wiring
This section describes the required AC wire size and the overcurrent
protection needed. It also provides information on how to make the
AC connections.
WARNING: All wiring should be done by a qualifi ed
person or a licensed electrician following all local/NEC
codes.
17
2.0 Installation
Connect a short wire (same rating as the DC wires) to one end of the
fuse block and the other end of the short wire to the positive terminal
of the last battery string (see Figure 16). This is essential to ensure
even charging and discharging across the entire battery bank.
Ensure the DC wire connections (to batteries, inverter, and fuse lugs/
DC circuit breaker) are fl ush on the surface of the DC terminals, and
the hardware (lock washer and nut) used to hold these connections
are stacked correctly (see Figures 9 and 10).
Verify all DC connections are torqued from 10 to 12 foot-pounds.
Once the DC connections are completely wired and tested, coat the
terminals with an approved anti-oxidizing spray.
Press the red and black terminal covers onto the inverter’s DC con-
nectors to secure them in place.
If batteries are in an enclosure, perform a fi nal check of the hold
down brackets and all connections. Close and secure the battery
enclosure.