THW-LS

3 coding systems recognise this code

NOM / NMX (Mexico)

Symbol	Meaning
`T`	Thermoplastic (Termoplastico) insulation
`W`	Resistant to water (Resistente al agua)
`LS`	Low smoke emission (Baja emision de humos); PVC-LS is flame-retardant, low smoke, low HCl, not halogen-free
`THW-LS`	Thermoplastic water-resistant low-smoke building wire (Mexico). 600 V, 75 C wet, 90 C dry (sources conflict). NOM-063-SCFI; NMX-J-010-ANCE

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

NBN

Symbol	Meaning
`T`	Telephone Cable
`H`	Resistant To Humidity
`W`	Polyethelene (PE)
`L`	Lead Sheath
`S`	Fine-Wired For Fixed Installations-Class 5