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600 Volt SO Rubber
Insulated, 4-Wire
DIFFERENCE
BETWEEN:
-
600 VOLT
(SO), and
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300 VOLT (SJO)
Cords
SO and SJO
rubber-insulated portable cords differ mainly in terms of
voltage and application:
-
SO (Severe
Service) is 600V for heavy-duty industrial use with
thicker insulation, while SJO (Junior Service) is 300V for
lighter commercial/residential tasks, with thinner
insulation and a smaller gauge range (e.g., 10-18 AWG).
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Both have
oil-resistant (O) features, but SO handles higher power
demands, whereas SJO is lighter and more flexible for
appliances and temporary lighting.
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 600
Volt SO Rubber Insulated, 4-Wire
> Cut-To-Length,
Sold Price Per Foot, Typical Full Spool Length: 250'
KEY TAKEAWAY:
Choose SO/SOOW for heavy equipment, industrial machinery, or applications
needing 600V.
Choose SJO/SJOOW for portable
tools, temporary lighting, or smaller appliances with 300V limits.
The heavier SO jacket and
thicker wire gauge reduces voltage drop and cord over-heating.
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