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 current
available from the connected battery bank. 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.
Table 2-2
DC Wiring Examples for 24 V chargers
a
Wire Length
(
max length one way)
Wire Size (AWG and mm
2
)
feet meters TC1524 TC2024 TC3024 TC5024
51.5No. 14
2mm
2
No. 10
5.3 mm
2
No. 10
5.3 mm
2
No. 6
13.3 mm
2
7.5 2.25 No. 14
2mm
2
No. 10
5.3 mm
2
No. 10
5.3 mm
2
No. 6
13.3 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
a.Values based on American Boating and Yachting Council E-11 2008 Table VI-A and
Table IX.
1.Per American Boating and Yachting Council E-11.
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