NEC Cable Types

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The National Electricity Code (NEC or NFPA 70) includes a series of cable types for fixed wiring in Article 310.104. This page provides an outline of the cable types listed in the standard (based on NEC 2011 edition).

List of Cable Types

Cable Type Max Operating Temperatures (oC / oF) Description Application
FEP / FEPB 90 / 194
200 / 392
Fluorinated etyhlene propylene (FEP)
Fluorinated etyhlene propylene with braid (FEPB)
FEP: dry and damp locations
FEPB: dry locations
MI 90 / 194
250 / 482
Mineral insulated (metal sheathed) 90oC: dry and wet locations
250oC: special applications
MTW 60 / 140
90 / 194
Moisture, heat and oil resistant thermoplastic 60oC: machine tool wiring in wet locations
90oC: machine tool wiring in dry locations
PFA / PFAH 90 / 194
200 / 392
250 / 482
Perfluoro-alkoxy (PFA)
Perfluoro-alkoxy, high temperature (PFAH)
90oC: dry and damp locations
200 and 250 oC: dry locations - special applications
RHH 90 / 194 Thermoset rubber, heat resistant Dry and damp locations
RHW / RHW-2 75 / 167
90 / 194
Thermoset rubber, moisture resistant Dry and wet locations
SA 90 / 194
200 / 392
Silicone rubber 90oC: dry and damp locations
200oC: special applications
SIS 90 / 194 Thermoset Switchboard wiring only
TBS 90 / 194 Thermoplastic with outer braid Switchboard wiring only
TFE 250 / 482 Extruded polytetrafluoroethylene Dry locations only
THHN 90 / 194 Thermoplastic, heat resistant, nylon jacket outer sheath Dry and damp locations
THHW 75 / 167
90 / 194
Thermoplastic, heat and moisture resistant 75oC: wet locations
90oC: dry locations
THW / THW-2 75 / 167
90 / 194
Thermoplastic, heat and moisture resistant THW - 75oC: wet locations 90oC: special applications (electric discharge lighting)
THW-2 - dry and wet locations
THWN / THWN-2 75 / 167
90 / 194
Thermoplastic, moisture and heat resistant, nylon jacket outer sheath Dry and wet locations
TW 60 / 140 Thermoplastic, moisture resistant Dry and wet locations
UF 60 / 140
75 / 167
Underground feeder and branch circuit Dry and wet locations (see Article 340.10 for provisions)
USE / USE-2 75 / 167
90 / 194
Underground service entrance cable Dry and wet locations (see Article 338 for provisions)
XHH 90 / 194 XLPE, heat resistant Dry and damp locations
XHHW / XHHW-2 75 / 167
90 / 194
XLPE, heat and moisture resistant XHHW - 75oC: wet locations, 90oC: dry and damp locations
XHHW-2 - Dry and wet locations
Z 90 / 194
150 / 302
Modified ethylene tetrafluoroethylene 90oC: dry and damp locations
150oC: dry locations (special applications)
ZW / ZW-2 75 / 167
90 / 194
150 / 302
Modified ethylene tetrafluoroethylene, moisture resistant ZW - 75oC: wet locations, 90oC: dry locations, 150oC: dry locations (special applications)
ZW-2 - dry and wet locations
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