Often, the term wires and cables are used interchangeably. But they are different. A wire is a single electrical conductor but a cable is a group of wires wound together with a single sheathing. Wires are used for transmission of electricity or electrical signals and are designed using varying materials.
The design of wires in the market is strongly regulated to ensure that only high-quality ones that guarantee the safety of users are sold in the market. The size of the wire determines the quantity of power it can carry. The bigger the size (higher number in the American wire gauge system), the more the voltage it can carry. In addition to the size, wires and cables can be categorized into five types.
1) Triplex wires: These are commonly used in single-phase service drop conductors, especially between weather heads and power poles.
2) Main feeder wires: These wires are mainly used to connect service weather head to houses.
3) Panel feed wires: These are black and used to power circuit breaker
panels and main junction box.
4) Non-metallic sheathed wires: These wires have 2-3 conductors and are the common models used in most homes. They have plastic insulation.
5) Single strand wires: This category of wires uses THHN wire though you can also get some variations in the market. They are the mostly preferred models for electrical layouts.