Lead wire is a small- to medium-gauge wire (22 to 10 AWG) with an insulated conductor for use in high-temperature environments. The insulation won't melt and safeguards the conductor core from heat to extend machinery life. High-temperature lead wire is typically used to create electrical connections and provide power in industrial heaters, furnaces, cement kilns, and food-service appliances.

Hookup wire is a small- to medium-gauge (24 to 8 AWG) insulated wire used to make internal connections inside enclosed electrical or electronic devices. It is typically used to supply power in low-voltage, low-current applications such as control panels, meters, ovens, and electronic equipment. It is resistant to acids, oils, and moisture and is easy to strip and cut.