I have used a 1mm² wire to power my refrigerator and my ro water purifier? My electrician had set that up and he told me that he is using a 1.5mm² wire! so is 1mm² wire ok to power up my refrigerator and water purifier? Any harm? please advice. Many thanks in advance

  • 1
    What do all the amounts of tables you can find on the interwebs say? And this is a comment because I cannot find my mindreading hat that would tell me how much amps your appliances draw... – PlasmaHH Sep 14 '15 at 18:40
  • My refrigerator say max 1.1A and idk about my water purifier! Is there not something like the max load the wire can handle before the insulation starts melting and burning? – Dragon Sep 14 '15 at 18:44
  • 1
    Here's a chart: s.eeweb.com/members/cody_miller/answers/… It tells you how hot a wire with a certain cross section will be when conducting a certain current. Unfortunately you don't specify how much current your devices will draw. – FakeMoustache Sep 14 '15 at 18:57
  • 1
    Why are you not using gauges and amperage for your comparison/assessment? For instance, I know offhand that 12 ga wire is suitable for 20 amp applications, 14ga for 15 amps, etc. – BrownRedHawk Sep 14 '15 at 19:31
  • Thank you all! @ brown My compressor says 11 amps! So, I don't think it's cool for me to use a 1mm² wire! Isn't it? Should I go for a 1.5mm² wire or 2.5mm²? – Dragon Sep 14 '15 at 19:46

Disclaimer: Consult local electrical code, and/or utilize a licensed and experienced electrician.

Typically there are code restrictions for what kind of supply wire should be present for different installations. This is usually a function of the Amperage of the system, not the device plugged in. For instance, a 20 amp service at 120 v in the US is typically required to be wired in 12 GA solid copper (or 3.31mm2).

Since this amperage is the primary concern, I would stick to anything larger than or equal to at least the equivalent of 14ga wire. However to minimize things like dimmer of other related circuits, I would stick to 12Ga wire where possible.

Wire size conversions - http://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html

  • 1
    I think you're slightly backwards. The wire is sized to the load, and the breaker is sized to the wire. – Tester101 Sep 14 '15 at 22:16
  • @tester this is a good clarification. My explanation was more visual/functional than from the code's logic, but at the end of the day they should be matched. – BrownRedHawk Sep 14 '15 at 23:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.