I need to replace the power cord for my prebuilt PC, which originally came with a 250V-rated cable. Standard replacement cables here seem to be rated for 125V, so I'm wondering whether that would be sufficient or if I need to match the original rating. The computer has a 750W power supply, and I'm located in the United States.
3 Answers
The cord itself doesn’t set the PC’s operating voltage—it just carries power from the outlet. The important things are that the plug fits, the cable is rated for your outlet voltage and current, and the connector matches the power supply. A 125V-rated cord is the normal choice for standard American outlets.
A 750W rating describes the maximum power the supply can deliver, not the voltage required by the cord. For a normal U.S. outlet, use a cord with the correct plug and at least a 125V rating. Don’t connect it to a 240V appliance outlet unless the power supply and plug are specifically designed for that setup.
Use a cord rated for the voltage provided by your wall outlet. In the United States, standard household outlets are nominally 120V, so a properly rated 125V computer power cord is appropriate. The 250V marking on the original cable doesn’t mean the PC needs 250V; it may simply be a higher-rated, internationally common cable. Check the power supply label too—most modern units accept something like 100–240V automatically.
Look for an input range such as “100–240V, 50/60Hz” on the power supply. If it has that marking, it will automatically handle the household voltage.