User Guide

TROJAN BATTERY
10
3.4.Cable Size
Battery cables should be sized to handle the expected load. Refer to Table 1 for the maximum amperage
based on the cable/wire gauge size.
Table 1
Cable/Wire Gauge Size, AWG (mm
2
)
Ampacity (amps)
14 (2.08) 20
12 (3.31) 25
10 (5.26) 35
8 (8.36) 50
6 (13.3) 65
4 (21.1) 85
2 (33.6) 115
1 (42.4) 130
1/0 (53.5) 150
2/0 (67.4) 175
4/0 (107) 230
Table values are from NEC Table
310.15(B)16 for copper cables
rated at 167°F (75°C), operating
at an ambient temperature of no
more than 86°F (30°C). Lengths in
excess of 6 feet (1829 mm) may
require heavier gauge wire to
avoid unacceptable voltage drop.
In series/parallel battery banks, it
is preferable for all series cables to
be the same length, and all parallel
cables to be the same length.
For more information refer to the
National Electrical Code for correct
cable/wire size, which can be
located at www.nfpa.org.