power cable
An insulated cable which carries electrical current.
power cable: the heavy-duty wire that moves electricity to machines
A power cable is a conductor or bundle of conductors wrapped in protective insulation, sized and rated to safely deliver electrical current from a source to an industrial load. Unlike signal or control wiring, power cables carry the full working amperage needed to run motors, heaters, welders, or other equipment, and must handle both the steady-state current and the inrush surge when a device starts up.
Cable construction varies by duty. A basic industrial power cable has one or more copper or aluminum strands at the core, surrounded by thermoplastic or rubber insulation rated for the voltage (typically 600 V or 1000 V in plants), then an outer sheath of PVC, XLPE, or neoprene for mechanical and chemical protection. Larger cables add armor, steel tape or interlocked steel wire, to resist crushing, cutting, or abrasion on factory floors or job sites. Ground and neutral conductors run alongside the phase conductors, often color-coded (black, red, blue for phases; white or gray for neutral; bare copper or green for ground in North American practice).
Ampacity, the safe current-carrying capacity, depends on conductor cross-section, material, insulation type, and installation method. A 10 AWG copper cable rated for 600 V might safely carry 40 amps in conduit but only 30 amps in free air; a 4/0 AWG (107 mm²) cable can handle 230 amps or more. Selection tables in the National Electrical Code (NEC) or IEC 60364 standards guide the choice. Undersizing causes overheating and fire risk; oversizing wastes cost and space.
Common failure modes and selection pitfalls
Power cables fail when insulation is damaged by heat, oil, sunlight, or physical impact; when the core amperage exceeds the cable's rating; or when water or conductive dust ingress causes leakage current. Temporary jobsite cables without proper strain relief or armor are especially vulnerable. The cable diameter, weight, and bend radius must be compatible with cable trays, conduit runs, and connection hardware. Splices, if made at all, must use rated connectors, not tape or solder.
The term 'power cable' distinguishes this category from control cable (lighter gauge, lower voltage, many twisted pairs), from coax or fiber optic (signal purposes), and from bare or insulated single conductors used in temporary or low-voltage wiring. In industrial supply catalogs, power cables are usually listed by voltage rating, conductor size in AWG or mm², insulation material, armor type, and length, with specifications for flexibility, temperature rating (often 60 to 90 degrees Celsius), and flame spread.