Can I run an extension cord under a rug?

No. CPSC and ESFI warn against covering cords with rugs or routing them where heat and physical damage can build unnoticed.

Can I use an extension cord permanently for a desk?

Extension cords are intended for temporary use. If the desk needs one continuously, consider a properly installed receptacle or another permanent wiring solution.

How do I know whether a cord can handle my equipment?

Use the cord’s marked current/wattage rating, wire gauge and length guidance, and the connected equipment’s input ratings. Follow equipment instructions where they prohibit extension-cord use.

Extension cord safety for desk setups

Extension cord safety for desk setups: rating, condition, routing, and temporary use.

Extension cords are useful temporary wiring. They become risky when the load exceeds the cord’s rating, the cord is damaged or covered, plugs fit loosely, or temporary wiring quietly becomes the permanent electrical plan.

The five-minute answer

Read the cord’s rating and the connected equipment labels. Use a listed cord intended for the environment, fully insert plugs, keep the cord uncovered and out of pinch points, and stop using it if it becomes hot or damaged. Do not route it under rugs, through doors/walls/ceilings/floors, or use it as a substitute for needed permanent wiring.

Load

Match the cord to the equipment, not the number of empty outlets.

Add the loads that can operate at the same time and compare them with the cord’s marked rating. Higher-current loads and longer runs can require heavier conductors. Use the manufacturer’s rating rather than guessing from cord thickness or connector appearance.

If an appliance manual says to plug directly into a wall receptacle, follow that instruction instead of finding a “bigger” extension cord.

Condition

Retire damaged or hot cords.

CPSC warns that overheating can occur at the plug, socket, or along the cord, and that a hot cord can indicate overload or damage. Replace cords with cracked insulation, damaged plugs, loose contacts, exposed conductors, or evidence of overheating. Do not tape over damaged insulation as a permanent repair.

Routing

Keep heat visible and protect the cord from mechanical damage.

Do not run extension cords under rugs or carpets.
Do not pinch them in doors, windows, furniture, or sharp desk hardware.
Do not staple or nail cords in place.
Use outdoor-rated cords only for outdoor use, and follow wet-location guidance.
Keep plugs fully seated and accessible for inspection.

Permanent desk use

If the cord never leaves, fix the power layout instead.

CPSC and ESFI describe extension cords as temporary wiring. A desk that permanently depends on a cord across a room is a signal to reconsider furniture placement or have a qualified electrician add/reposition receptacles where appropriate.

Sources