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This is the designation for a type of flexible cord ("junior hard service cord") for electrical uses up to 300 volts, having thermoplastic insulation of the conductors and a thermoplastic outer covering. The "W" designates compliance with requirements for outdoor use (water and weather resistant), suitable for use in wet locations. There may also be markings that indicate resistance to sunlight (UV) deterioration.
Approved cords should have durable markings every 24 inches showing the type, size of conductors and number of conductors.
The permitted amps through an SJTW depends upon whether it has 2 current-carrying conductors or three or more, and the size of the conductors. An 18AWG/2 is 10A, and 14AWG/3 is 15A, for example (at ambient T of 86F, 30C).
NEC Table 400.4, rule 400.6
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