Wire Sizes And Maximum Length Determination Chart Page 10
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11Wire Sizes and Maximum Length Determination
(7/5/2007)
39
0.0035
0.0889
831.8000
2728.00
0.11
0.0175
40
0.0031
0.0787
1049.0000
3440.00
0.09
0.0137
All extension-cord jackets are marked with a code that indicates (among other
information) the American wire gauge (AWG) as well as the jacket material and its
properties, according to standards established by the National Electrical Code.
Then there's the challenging of deciphering that odd code on the side of most of your
extension cords.
In the picture above, The AWG 12-3 is telling you the American Wire Gauge (AWG) is
12 and there are 3 wires inside. The SEOW means... well, see below:
O: Oil-resistant, usually synthetic-rubber jacket, more flexible in cold temperatures
OO: Oil-resistant synthetic-rubber jacket and inner-conductor insulation
S: Standard service (synthetic-rubber insulated, rated for 600v)
SE: Extra-hard usage, elastomer
SEOW: Oil-resistant and weather-resistant elastomer jacket, rated for 600v (photo
above)
SJ: Service junior (synthetic-rubber insulated, rated for 300v)
SJO: Same as SJ but Neoprene, oil resist compound outer jacket, rated for 300v
SJOW: Oil-resistant and weather-resistant synthetic rubber, rated for 300v
SJOOW: Oil-resistant and weather-resistant synthetic rubber (jacket and conductor
insulation), rated for 300v
SJT: Hard service thermoplastic pr rubber insulate conductors with overall plastic
jacket, rated for 300v
SJTOW: Oil-resistant and weather-resistant thermoplastic, rated for 300v
SJTW: Thermoplastic-jacketed, weather-resistant, rated for 300v
SO: Extra hard service cord with oil resistant rubber jacket, 600v
SOOW: Same as SOW but with oil resistant rubber conductor insulation and suitable
for outdoor use.
SOW: Rubber jacketed portable cord with oil and water resistant outer jacket
SPT-1: All rubber, parallel-jacketed, two-conductor light duty cord for pendant or
portable use, rated for 300v
SPT-2: Same as SPT-1, but heavier construction, with or without third conductor
for grounding purposes, rated for 300v
SPT-3: Same as SPT-2, but heavier construction for refrigerators or room air
conditioners, rated for 300v
ST: Extra-hard usage, thermoplastic (PVC), 600v
STO: Same as ST but with oil resistant and thermoplastic outer jacket, 600v
STOW: Same as STO but with oil and water resistant thermoplastic outer jacket,
600v
Page 10 of 11
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