THW-2

3 coding systems recognise this code

NEC / UL (USA)

Symbol	Meaning
`T`	Thermoplastic (PVC) insulation
`H`	Heat resistant, 75 C (one H)
`W`	Approved for wet locations
`THW`	Thermoplastic heat- and moisture-resistant building wire, 75 C. 600 V, 75 C dry and wet. UL 83; NEC Article 310

NEC 310

Symbol	Meaning
`T`	Thermoplastic Insulation
`H`	75°C Insulation
`W`	Moisture Resistant
`-2`	With Insulation For Use In Wet Or Dry Locations At Max. Temp. 90°C

NEC 400

Symbol	Meaning
`T`	Flat Tinsel Cord
`H`	Heater Cord
`W`	Suitable For Use In Wet Locations And Sunlight Resistant
`-2`	Insulation Thickness (Normal) / 0.045" (1.143 Mm)