Technical Foundation
What Is a Power Supply Cord?
A power supply cord (line cord or cordset) is the flexible cable assembly connecting equipment to an AC power source, terminated at each end with a specific plug and connector configuration — commonly a NEMA plug on one end and either a bare/hardwired connection, an IEC appliance inlet connector (C13, C14, C19, C20), or a locking twist connector on the other. Wire gauge (AWG) and jacket type must be rated for the equipment's actual current draw and the environment the cord will be run in.
Undersized gauge for a given current and length causes voltage drop and heat buildup — a critical safety issue on long runs or high-draw equipment, which is why gauge tables reference both amperage and cord length together, not amperage alone. Jacket material must match the environment: SJT/SJO for light general indoor duty, SOOW for oil-resistant, outdoor and abrasion-heavy industrial use, and UL/CSA-listed cordsets are required wherever the connection is part of a certified equipment installation.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Wire Gauge (AWG) | 10-18 AWG common for supply cords | Must be sized to actual current draw and cord length together — undersized gauge causes voltage drop and heat |
| Plug/Connector Type | NEMA 5-15P, 5-20P, L5-20, IEC C13/C14/C19/C20 | Must match both the equipment's inlet and the facility's outlet configuration |
| Jacket Type | SJT, SJO, SOOW, SEOOW | SOOW/SEOOW rated for oil, outdoor and abrasion resistance; SJT for lighter general indoor duty |
| Voltage/Amperage Rating | e.g. 125V/15A, 250V/20A | Must meet or exceed the equipment nameplate rating with margin, not just match it exactly |
| Certification | UL, CSA, VDE listed | Required for use in certified equipment installations and to meet electrical code compliance |
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Applications
Where Power Supply Cord Get Used
Power supply cords are specified anywhere equipment needs a correctly rated, code-compliant connection between its power inlet and the facility's electrical supply.
IT & Data Center Equipment
IEC C13/C14 power cords connecting servers, network equipment and PDUs within standardized rack power distribution.
Industrial Machinery & Equipment
Heavy-duty SOOW cordsets supplying power to shop equipment exposed to oil, coolant and physical abrasion.
Appliance Manufacturing & Repair
Replacement appliance cords matched to OEM gauge and plug configuration for warranty and field service repairs.
Construction & Job Site Power
Rugged extension and supply cords rated for outdoor exposure and temporary power distribution on active sites.
International Equipment Deployment
Region-specific plug configurations for equipment shipped or operated outside its country of origin.
Commercial Kitchen Equipment
Oil and heat-resistant cordsets supplying power to equipment operating in food-service environments.
FAQ
Power Supply Cord Questions, Answered
How do I choose the right wire gauge for a power cord?
Gauge selection depends on both the equipment's current draw (amps) and the cord's length, since voltage drop increases with both current and distance — an undersized gauge run too long can overheat or fail to deliver adequate voltage to equipment. Manufacturer gauge/length/amperage tables should be checked together rather than assuming a given AWG is fine at any length.
What's the difference between SJT and SOOW cord jackets?
SJT is a lighter-duty jacket suited to general indoor use with moderate flexing and no significant chemical or oil exposure. SOOW is a heavier, oil-resistant and more abrasion-resistant jacket rated for outdoor use and harsher industrial environments — the extra letters (O, O) specifically denote oil resistance in both the outer jacket and inner insulation.
How do I match an IEC connector type to my equipment?
IEC connectors are standardized by shape and current rating — C13/C14 is the common computer and light-equipment size (rated around 10A), while C19/C20 is a larger, keyed connector rated for higher current (typically 16A) and used on equipment like PDUs and higher-draw servers. Check the equipment's power inlet against these standard shapes rather than assuming compatibility from a similar-looking cord.
Can I use a power cord rated for lower amperage than my equipment needs?
No — a cord's voltage and amperage rating must meet or exceed the equipment's nameplate draw, ideally with reasonable margin. Using an undersized cord is a fire and equipment damage risk, since sustained current above the cord's rating causes excessive heat buildup in the conductors and insulation.
Why does UL or CSA listing matter for a power supply cord?
UL and CSA listing confirms the cord has been independently tested to meet defined safety standards for construction, insulation and current-carrying capacity. Many certified equipment installations and electrical codes require listed cordsets specifically, and an unlisted cord can void equipment certification or fail an electrical inspection.
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