975-0526-01-02 13
Preparing For Installation
DC Wiring
The following tables show some typical wire sizes for various cable length
runs, based on 3% voltage drop on DC cables, 75 °C (167 °F) rated wire
with wiring being inside the engine compartment – assumed ambient of
50 °C (122 °F).
NOTE: In the event of a conflict between the voltage drop table (Table IX)
and the ampacity table (Table VI-A) use the larger wire size.
NOTE: In the event of a conflict between the voltage drop table (Table IX)
and the ampacity table (Table VI-A) use the larger wire size.
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
Table 1
DC Wiring Examples for 12 V chargers
a
a.Values based on American Boat & Yacht Council E-11 2008
Table VI-A and Table IX.
Wire Length
(
max length one way)
Wire Size (AWG and mm
2
)
feet meters TC2012 TC4012 TC6012
51.5No. 10
(5.3 mm
2
)
No. 8
(8.4 mm
2
)
No. 6
(13.3 mm
2
)
7.5 2.25 No. 10
(5.3 mm
2
)
No. 6
(13.3 mm
2
)
No. 4
(21.2 mm
2
)
20 6 No. 6
(13.3 mm
2
)
No. 2
(33.6 mm
2
)
No. 1
(42.4 mm
2
)
Table 2
DC Wiring Examples for 24 V chargers
a
a.Values based on American Boat & Yacht Council E-11 2008
Table VI-A and Table IX.
Wire Length
(
max length one way)
Wire Size (AWG and mm
2
)
feet meters TC1024 TC2024 TC3024
5 1.5 No. 16
(1.3 mm
2
)
No. 10
(5.3 mm
2
)
No. 10
(5.3 mm
2
)
7.5 2.25 No. 16
(1.3 mm
2
)
No. 10
(5.3 mm
2
)
No. 10
(5.3 mm
2
)
20 6 No. 10
(5.3 mm
2
)
No. 8
(8.4 mm
2
)
No. 6
(13.3 mm
2
)
1.Per American Boat & Yacht Council E-11.
TC2 204060 Series BattChg Owners Guide.book Page 13 Friday, July 8, 2011 11:44 AM
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