美标UL1277　THHN　外护套，多芯护套线。
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Application
THHN/THWN/THWN-2 are primarily used in conduit and cable trays for services,90℃ dry, THWN is rated at a conductor temperature of 75℃ dry or wet, THWN-2 is rated at a conductor temperature of 90℃600V application. 
Construction
Conductors: Soft annealed copper, bare or tinned.
Sizes 14AWG-1000kcmil: Solid or stranded.
Insulation:: per UL83.
Jacket:: per UL83.
Information  on  the  cable:  AWG or kcmil size, type letters, rated voltage, the name of the manufacturer, UL file number, characteristic, manufacture date, FEET.