Electrical Wire Sizes Selection Guide
The chart below indicates the approximate outside diameter
of various insulated and uninsulated electrical wires. Utilize this
table when selecting abrasion protection or cable accessory
products, such as heat shrink or fixed diameter cable clamps.
Approximate Wire Outside Diameter In. (mm)
WIth THW/ WIth TFN/ Uninsulated Conductors, Range
THHW Indicates a
THHW/TW THHN/THWN
fine strand flexible wire Size Insulation Insulation Min. Max.
with Thermoplastic
24 AWG 0.059 (1.5) 0.088 (2.2) 0.020 (0.5) 0.024 (0.6)
insulation. Moisture, oil
22 AWG 0.066 (1.7) 0.094 (2.4) 0.025 (0.6) 0.031 (0.8)
and acid resistant.
THWN Indicates a
20 AWG 0.071 (1.8) 0.101 (2.6) 0.032 (0.8) 0.038 (1.0)
Rated 105C wet or dry.
single conductor
18 AWG 0.084 (2.1) 0.111 (2.8) 0.040 (1.0) 0.049 (1.2)
having flame-retardant,
16 AWG 0.096 (2.4) 0.124 (3.1) 0.051 (1.3) 0.060 (1.5)
THW Indicates a
moisture and
14 AWG 0.111 (2.8) 0.133 (3.4) 0.064 (1.6) 0.073 (1.9)
single conductor
heat-resistant
having flame-retardant,
12 AWG 0.130 (3.3) 0.152 (3.9) 0.081 (2.1) 0.095 (2.4)
thermoplastic insulation
moisture and
10 AWG 0.164 (4.2) 0.176 (4.5) 0.102 (2.6) 0.116 (2.9) with a jacket of
heat-resistant
extruded nylon or
8 AWG 0.216 (5.5) 0.236 (6.0) 0.128 (3.3) 0.146 (3.7)
thermoplastic insulation.
equivalent material.
6 AWG 0.254 (6.5) 0.304 (7.7) 0.162 (4.1) 0.184 (4.7)
The wire is rated 75C
The wire is rated 75C
4 AWG 0.324 (8.2) 0.352 (8.9) 0.204 (5.2) 0.232 (5.9)
wet or dry.
wet or dry. THWN wire
3 AWG 0.352 (8.9) 0.380 (9.7) 0.229 (5.8) 0.260 (6.6)
suitable for exposure to
2 AWG 0.384 (9.8) 0.420 (10.7) 0.258 (6.6) 0.292 (7.4)
TW Indicates a
mineral oil and to liquid
single conductor
1 AWG 0.446 (11.3) 0.492 (12.5) 0.289 (7.3) 0.332 (8.4)
gasoline and gasoline
having flame-retardant,
1/0 0.486 (12.3) 0.532 (13.5) 0.325 (8.3) 0.373 (9.5) vapors at ordinary
moisture-resistant
ambient temperature
2/0 0.532 (13.5) 0.578 (14.7) 0.365 (9.3) 0.418 (10.6)
thermoplastic
is marked Gasoline
3/0 0.584 (14.8) 0.630 (16.0) 0.410 (10.4) 0.470 (11.9)
insulation. The wire is
and Oil Resistant I if
4/0 0.642 (16.3) 0.688 (17.5) 0.460 (11.7) 0.528 (13.4)
rated 60C wet or dry.
suitable for exposure
250 MCM 0.711 (18.1) 0.765 (19.4) 0.500 (12.7) 0.575 (14.6)
to mineral oil at 60C,
300 MCM 0.766 (19.5) 0.820 (20.8) 0.548 (13.9) 0.630 (16.0)
TFN Indicates a
or Gasoline and Oil
thermoplastic-insulated
350 MCM 0.817 (20.8) 0.871 (22.1) 0.592 (15.0) 0.681 (17.3)
Resistant II if the
wire. The wire is rated
400 MCM 0.864 (21.9) 0.918 (23.3) 0.633 (16.1) 0.728 (18.5)
compound is suitable
at a 90C maximum
for exposure to mineral
500 MCM 0.949 (24.1) 1.003 (25.5) 0.707 (18.0) 0.813 (20.7)
operating temperature.
oil at 75C. Gasoline-
600 MCM 1.051 (26.7) 1.113 (28.3) 0.775 (19.7) 0.893 (22.7)
resistant wire has been
700 MCM 1.122 (28.5) 1.184 (30.1) 0.837 (21.3) 0.964 (24.5)
THHN Indicates a
tested at 23C when
750 MCM 1.156 (29.4) 1.218 (30.9) 0.866 (22.0) 0.998 (25.3)
single conductor
immersed in gasoline.
800 MCM 1.188 (30.2) 1.250 (31.8) 0.894 (22.7) 1.031 (26.2)
having flame-retardant
It is considered
and heat-resistant 900 MCM 1.252 (31.8) 1.314 (33.4) 0.949 (24.1) 1.093 (27.8)
inherently resistant to
thermoplastic
1000 MCM 1.310 (33.3) 1.372 (34.8) 1.000 (25.4) 1.152 (29.3)
gasoline vapors within
insulation with a jacket
the limits of the
1250 MCM 1.539 (39.1) 1.121 (28.5) 1.289 (32.7)
of extruded nylon or
temperature rating.
1500 MCM 1.662 (42.2) 1.228 (31.2) 1.412 (35.9)
equivalent material.
1750 MCM 1.776 (45.1) 1.327 (33.7) 1.526 (38.8)
The wire is rated
2000 MCM 1.882 (47.8) 1.419 (36.0) 1.632 (41.5)
90C dry only.
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