Maximum Overcurrent Protection Ampacity; Wire Sizes - Outback Power Systems FX AND VFX SERIES Installation Manual

MAXIMUM OVERCURRENT PROTECTION AMPACITY

This rating specifies the proper overcurrent protection ampacity.
• OBDC breakers are panel-mount circuit breakers.
• Class T DC fuses are terminal-mounted and should always be used in conjuncture with a disconnect mechanism.
• FXs used in home installations should use properly sized DC circuit breakers.
• A DC breaker includes both overcurrent protection and disconnect capability.
• OutBack Power Systems recommends Class T fuses for marine installations where a DC disconnect is not required.
MODEL
FX2012(M)T
FX2024(M)T
FX2532(M)T
FX2548T
VFX2812(M)
VFX3524(M)
VFX3232(M)
VFX3648

WIRE SIZES

The following chart contains information on wire sizes, the DC resistance of the wires and the
corresponding diameters and areas of these wires. This information can be used to calculate the
voltage drop of the wires or to find an equivalent wire size.
SIZE DC
(AWG)
Resistance in Ohms
(1000 feet)
14 3.14
12 1.98
10 1.24
8 0.78
6 0.50
4 0.31
2 0.19
1 0.15
1/0 0.12
2/0 0.10
3/0 0.08
4/0 0.06
AMPACITY DC BREAKER
260 amps OBDC-250
175 amps OBDC-175
175 amps OBDC-175
100 amps OBDC-100
260 amps OBDC-250
260 amps OBDC-250
175 amps OBDC-175
175 amps OBDC-175
CROSS-SECTIONAL AREA
INCHES
.0032
.0051
.0082
.0130
.0206
.0328
.0521
.0657
.0829
.1045
.1318
.1662
DC FUSE
Class T-400 (Mobile Only)
Class T-300 (Mobile Only)
Class T-300 (Mobile Only)
Not Recommended
Class T-400 (Mobile Only)
Class T-400 (Mobile Only)
Class T-300 (Mobile Only)
Not Recommended
APPROXIMATE DIAMETER
MILLIMETERS INCHES
2.08
3.31
5.26
8.37
13.30
21.15
33.62
42.41
53.50
67.43
85.01
107.20
MILLIMETERS
.078 1.98
.101 2.57
.126 3.20
.162 4.11
.215 5.46
.269 6.83
.337 8.56
.376 9.55
.423 10.74
.508 12.90
.576 14.63
.645 16.38
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