Preparing for Installation
975-0402-01-01
2–9
This guide for use by qualified installers only
Over-current protection disconnect
Electrical codes require the DC circuit from each battery to
the charger to be equipped with a disconnect and an over-
current protection device, usually within 7 inches (17.8 cm)
of each battery
1
. The devices are usually DC-rated circuit
breakers, fused disconnects, or a separate fuse and disconnect
for each circuit. These devices must be rated for DC voltage
and current and be rated to withstand the short circuit rating
of each battery. Do not substitute devices rated only for AC
voltage; they may not operate properly.
The current rating of the DC fuses must be correctly matched
to the size of the DC wiring used, in accordance with the
applicable codes. This helps to protect the installation against
fire in case of any overcurrent or short circuit fault.
The DC chassis ground (earth) should also be sized correctly
to provide ground fault protection (see Table 2-1). Refer to
the local electrical codes for your specific installation to
determine the correct gauge and length.
Table 2-2
DC Wiring Requirements for 24 V chargers
Wire Length
(
max length one way
)
Wire Size (AWG and mm
2
)
feet
meters
TC1524
TC2024
TC3024
TC5024
5
1.5
No. 16
1.3 mm
2
No. 14
2 mm
2
No. 12
3.3 mm
2
No. 10
5.3 mm
2
7.5
2.25
No. 14
2 mm
2
No. 12
3.3 mm
2
No. 10
5.3 mm
2
No. 8
8.4 mm
2
20
6
No. 10
5.3 mm
2
No. 8
8.4 mm
2
No. 6
13.3 mm
2
No. 4
21.2 mm
2
1.Recommended by the American Boating and Yachting Council.
TC2 Series BattChg Install Guide.book Page 9 Monday, June 30, 2008 3:18 PM