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I am using EVGA - SuperNOVA G2 850W 80+ Gold Certified Fully-Modular ATX Power Supply for my current build, and my load seems to be 470W. For my computer monitors, I am using Lenovo LT2452P. So, I need one power cord for PC and one for the monitor.

Questions:

  1. I am trying to determine between 18/16/14 AWG which power supplies do I need for my PC and my monitor.
  2. I already have some power cords, but how could I determine what AWG do they have?
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If your load is 470W, then even at 110V (worst-case scenario), you are using 4.3A. According to the AutoZone guide, even at the thinnest (18AWG) wire, you can run 13 Amps through it (which is >3 times what you are using), and having it heat only to 150°F. Therefore, you can run the 18AWG wire without any problems.

In general, when asking this, you should include the length of the power cable, and the temperature you'll use it in -- as it makes a huge difference. For example, I had a 24AWG cable that could handle ~150A at below freezing, which is ~35 times as much as your scenario -- precisely because it is only a couple inches long. One time I used it at above a freezing temperature, and it melted the isolation off of it.

| improve this answer | |
  • The length could be 6-10 feet. The use is at the ambient temperature (25-100 F). The ampere (A) is what the standard American house hold would allow. – ablaze Dec 2 '18 at 15:38
  • OK, I updated my answer to match your scenario. – Alex Dec 7 '18 at 0:32

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