Common Electrical Wires
Common electrical wire sizes and types include THHN, THWN and cable, which both come in gauges 10, 12 and 14. Cable is also available in gauges 6 and 8.
The abbreviation THHN and THWN refer to the electrical code requirements these wires meet. T indicates the wire has thermoplastic insulation, while H stands for both heat resistance and high heat resistance up to 194 degrees Fahrenheit. W shows the wire is approved for use in wet or damp locations, while N indicates that oil and gas cannot harm the wire. These wires can carry up to 600 volts and are made of copper.
Household cables can carry 600 volts which is different from those used in industrial applications. The most common household cable is NM-B cable which can withstand up to 194 degrees Fahrenheit. Other most available cables include the UF cable which is used in damp areas; the armored cable, which is wrapped in a metal sheath and often found in older homes; the metal-clad cable, which is primarily used in industrial settings, etc.