THHW-CO

2 coding systems recognise this code

NEC / UL (USA)

SymbolMeaning
TThermoplastic (PVC) insulation
HHHigh heat resistant, 90 C range (two H)
WApproved for wet locations
THHWThermoplastic high heat-resistant, moisture-resistant building wire. 600 V, 90 C dry, 75 C wet. UL 83; NEC Article 310

NBN

SymbolMeaning
TTelephone Cable
HResistant To Humidity
HResistant To Humidity
WPolyethelene (PE)
CConcentric Copper Conductor
OInstallation Wire