Xantrex Freedom EX 4000 Installation Manual page 38

Basic Installation Procedures
DC Grounding
To connect the DC ground:
1. The equipment grounding lug (DC ground lug) on the DC
end of the Freedom EX 4000 is used to connect the
chassis of the Freedom EX 4000 to your system's DC
negative connection or grounding bus point as required by
electrical regulations.
2. Use copper wire that is either bare or provided with green
insulation. Do not use the DC ground lug for your AC
grounding. See the AC wiring instructions in this section.
3. Follow the guidelines below that correspond to the specific
type of installation. These guidelines assume you are
using the DC supply cable and fuse sizes recommended
in this guide. If you are using different sizes, refer to the
applicable installation code for DC grounding details.
4. See Figure 4 for the location of the DC ground lug. Make
sure to tighten the bolt on the DC ground lug to a torque of
23 in-lb (2.6 N-m) of force. Apply an anti-corrosion
compound to the copper wire prior to connecting to the DC
ground lug.
Recreational Use 8AWG minimum-sized, stranded
Vehicle copper wire rated minimum 75 °C and
connect it between the Chassis Ground
lug and the vehicle's DC grounding
point (usually the vehicle chassis or a
dedicated DC ground bus). See
regulatory references below.
Marine Use copper wire that is bare or has
insulation rated minimum 105 °C, and
connect it between the Chassis Ground
lug and the boat's DC grounding bus or
engine negative bus. Use a wire of
gauge 3AWG minimum (one gauge less
than the DC supply cable size). See
regulatory references below.
For DC voltage systems under 50 VDC in an RV installation, an
Regulatory
8AWG copper bonding conductor would be acceptable for the
references
inverter/charger/converter enclosure ground bonding only per UL458
§63.6; §30.10 standard [≤ 150 mV @ 30A connection, per §63.9; §63.10]
and per ANSI/RVIA LV code §2-5.1 Bonding Voltage Converter
Enclosures. The "house" battery system must, however, be ground
bonded per ANSI/RVIA LV code §2-4 Auxiliary Battery Grounding; and
For DC voltage systems under 50 VDC in a marine installation,
[UL458 §SA7.2] a DC Grounding conductor shall not be smaller than
one size under that required for current carrying conductors supplying
the device per ABYC E-11 §11.16.2 but not less than 8AWG [USGC 46
CFR §111.05-31].
36 Freedom EX 4000 Installation Guide