A cord is a small, flexible electrical conductor or group of conductors, typically 10 AWG or smaller, enclosed within a protective jacket. It is primarily used in portable or movable applications that require flexibility, strength, and long-term durability.
In industrial and commercial electrical systems, a cord refers to a flexible cable designed to carry electrical power or signals to portable or movable equipment. Unlike fixed building wiring, cords are engineered to withstand continuous bending, twisting, and movement while maintaining reliable electrical performance and safety. Their flexible insulation and outer jacket provide protection against abrasion, moisture, and light mechanical stress, making them ideal for applications that demand both flexibility and resilience.
Cords generally contain two to four conductors, depending on the voltage and current requirements of the connected equipment. The conductors are typically made of stranded copper to enhance flexibility and minimize fatigue during frequent movement. Common insulating materials include thermoplastic compounds like PVC or rubber-based elastomers that balance flexibility with resistance to heat, chemicals, and wear. The outer jacket may also be color-coded or printed for easy identification and compliance with safety regulations.
Flexible cords are used across a wide range of industries to power portable machinery, lighting systems, AV equipment, and tools. Their design allows for safe and efficient operation in environments that require frequent equipment repositioning, such as workshops, event setups, or manufacturing facilities. Heavy-duty cords may also be rated for outdoor or industrial use, featuring reinforced jackets to resist oil, temperature extremes, and mechanical impact.
Cords are regulated by UL (Underwriters Laboratories), the NEC (National Electrical Code), and CSA (Canadian Standards Association). These organizations define standards for voltage ratings, insulation materials, environmental ratings, and construction requirements to ensure safety and reliability in flexible cable applications.
The flexible cord was developed in the early 20th century during the industrial electrification era, when factories required portable power for emerging electrical tools and equipment. Early cords were insulated with natural rubber, but advancements in polymer chemistry introduced synthetic compounds with better flexibility, oil resistance, and longer service life. These innovations helped shape modern portable power systems used in industrial and commercial applications today.