Power Cord for Desktop Computer: C14 Inlet, Length and Safety
Quick answer / TL;DR: A power cord for a desktop computer is, in the vast majority of cases, a C13 cord for the C14 inlet on the case rear. Match the inlet, pick 2 m for a typical desk and 3 m when the outlet is far, and put surge protection at the wall side, not inside the cord.
The phrase power cord desktop computer shows up in searches when a cord is missing – an unboxed PC, an old lead thrown away – or when it is damaged: cracked jacket, loose plug, discolored plug face. The good news is that it is almost always a standard part with one correct answer.
This guide walks through identifying the case inlet, choosing length and gauge, and the safety rules that keep a desktop power cord from becoming a fire risk or an arcing point.
Step 1: Identify the Case Inlet
Look at the back of the case near the power switch. A C14 inlet is a rectangular opening with three angled slots. A C6 (MIDI) inlet is smaller and rounded. Some all-in-one PCs use a round DC barrel with a center pin. Write down which one you have, because the cord you buy must match the inlet, not the old cable.
Quick visual test
- Three slots, wide rectangle – C14 inlet, buy a C13 cord
- Three slots, small and rounded – C6 inlet, buy a C5 (MIDI) cord
- Round socket with center pin – DC barrel, buy the exact rated barrel cord (5 V, 12 V or 19 V)
Step 2: Choose Length and Gauge
Measure from the inlet to the outlet with slack for the cord to rest in a natural curve, then add 30 cm. For a run under 2 m, a 1.8 m cord is enough. For a run of 2-3 m, choose 2 m or 3 m. On the gauge, 13 AWG is the recommended choice for any cord 2 m or longer; 16 AWG is acceptable on short 1.8 m cords feeding low-power office systems.
| Run distance | Cord length | Gauge |
|---|
| Outlet behind the desk, PC on desk | 1.8 m | 16-13 AWG |
| Outlet on the side wall | 2 m | 13 AWG |
| Floor outlet or opposite corner | 3 m | 13 AWG |
| Cable tray under the desk | 2 m | 13 AWG |
Step 3: Add Surge Protection Correctly
Plug the desktop power cord into a surge-protected strip or outlet protector rated for the desktop draw. Do not chain surge protectors end to end, and do not run the cord through a dimmer switch or an untested adapter. If the wall outlet is not grounded, the earth pin of the C13 cord cannot do its job – fix the outlet before relying on the cord.
C13 desktop power cords are stocked in 1.8 m, 2 m and 3 m with 13 AWG conductors and regional safety marks; the catalog lists the exact part numbers for each market.
Real-World Applications
Replacing a lost cord: a 2 m 13 AWG C13 cord is the universal spare for tower PCs, so keep one in the office drawer. Office rollout: buy the same 2 m cord for every workstation so spares are interchangeable across desks. Repair bench: when a C14 inlet is cracked, the cord replacement is part of the case repair quote – specify a new inlet plate, not just a new cord, or the arcing risk stays.
Related reading: The full desktop C13 buying guide: connector, gauge and certifications — desktop-pc-power-cord
Related reading: Cord length and AWG gauge in detail — desktop-power-cord-lengths
Frequently Asked Questions
What type of power cord does a desktop computer use?
Most tower desktops use a C13 cord for the C14 inlet on the case. Some older or compact PCs use a C5 (MIDI) cord for a C6 inlet, and all-in-one units often use a DC barrel cord. Check the inlet shape before ordering a replacement.
Can I use a laptop AC cable for my desktop?
No. Laptop adapters output low-voltage DC (19 V or 20 V) into a barrel jack, while a desktop PSU takes 100-240 V AC through a C13/C14 connector. The two are not interchangeable, and forcing one onto the other is unsafe.
How long should a desktop power cord be?
2 m covers most desks. Use 1.8 m if the outlet is directly behind the desk and 3 m if the outlet is across the room or in the floor. Add about 30 cm of slack so the cord is never stretched tight between the case and the outlet.
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