Prior to Installation | 11
2.2 CABLE SIZING
Refer to Table 3 for auxiliary battery, start battery and ground cable thickness requirements.
Always choose a cable cross sectional area equal to or greater than what is specified below.
Table 3: Recommended Cable Sizing
Part Number Cable Install Length
Recommended Cable
Cross Section
Closest BAE,
B&S, AWG
BCDC1212T
1–5 m 3–16' 5.3 mm² 10
5–9 m 16–30' 7.7 mm² 8
CAUTION: Cable and fuse sizes are specified by various codes and standards which depend
on the type of vehicle the Battery Charger is installed into. Selecting the wrong cable or fuse size
could result in harm to the installer or user and/or damage to the Battery Charger or other equipment
installed in the system. The installer is responsible for ensuring that the correct cable and fuse sizes are
used when installing this Battery Charger.
2.3 FUSING
Fuses must be connected close to the auxiliary battery and start battery in order to protect the
cabling and connectors between the batteries and the Battery Charger. REDARC recommends
using MIDI style bolt down fuses as they ensure a low resistance connection. The REDARC FK23
and FK30 fuse kits are recommended.
Blade type fuses are not recommended as they can result in a high resistance connection which
causes excess heat and may damage the fuse holder and/or the wiring. Self-resetting circuit
breakers are not recommended as they may trip prematurely due to the heat generated by the
current flowing through the cables.
Figure 4: MIDI style bolt-down fuse Figure 5: MIDI Fuse Assembly
CAUTION: In applications where the BCDC1212T draws power through the vehicle’s and trailer’s
towing harnesses and connectors, the harnesses wiring gauge, connectors and fuse current ratings
and fuse type should be checked by a suitably qualified person to ensure that it is adequately rated for
safe and reliable operation and that the vehicle’s fuse is appropriately rated and located to protect the
wiring in the event of a fault, including short circuits.
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