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Correct Metric Gauge Wire to Power Opus 150 Watt (Australia)

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  • Correct Metric Gauge Wire to Power Opus 150 Watt (Australia)

    Hi All,

    Whilst at my local "Super Cheap Auto" today (Australia), I thought I'd check out their wiring. To be honest, it only served to confuse me more, and I'm hoping someone can shed some light.

    I have an Opus 150 Watt that will be powering my Via Epia based system, and in the User Guide for the Opus it says to use:

    #12 AWG for power/ground
    #18 AWG for ignition

    Reading the very informative: FAQ: How to Wire an OPUS PSU, it quotes:

    1) You can use 10 gauge wire for the connections; I believe Opus recommends 12 awg. Most people use 10 to be safe, especially when running longer lengths to the trunk.
    2) Add the fuse to the fuse holder. You should use a fuse that is 15 20A, you dont want to go higher then 20A


    Now whilst I probably won't be wiring into the boot/trunk, I still want to be "safe", and make sure I use the right gauge wire. The problem is that we don't use the AWG in Australia - our wires are metric rated (in mm and/or mm). So I've reviewed a number of AWG to Metric Conversion Tables such as:



    My confusion deepens upon looking at the wires today. The thickest one they had there was sized at 5mm. Reviewing the charts, this would seem to put it between AWG 4 and AWG 5. However, the wire cable also says 2.90mm. Again reviewing the charts, this places it between AWG 12 and AWG 13, which sounds borderline at best. To confuse matters even further this cable also says "25 amp".

    I've searched these forums for the answers and found threads such as this, but to be honest, I'm more confused than enlightened.

    So finally getting to my questions, I'm hoping for advice on:

    1) Which standard/gauge/rating should I be looking at - mm or mm ?
    2) Which size fuse should I use ? 15A, 20A, or 25A ?

    Thanks in advance.

    Cheers,

    Long.1
    Worklog: 2006 Ford Territory Ghia (Melbourne, Australia)
    Mounting Components in Custom Carputer Box
    Attention Aussie's - Say G'day Here

  • #2
    Originally posted by long.1 View Post
    [FONT="Tahoma"]
    1) Which standard/gauge/rating should I be looking at - “mm” or “mm” ?
    They both should agree, it's simple geometry.
    The chart you have shown is correct. I would get a measuring tool (micrometer or small, engineer's ruler) and measure for myself. Or find a more reliable source of wire.

    Originally posted by long.1 View Post
    [FONT="Tahoma"]
    2) Which size fuse should I use ? 15A, 20A, or 25A ?
    If you find 10AWG equivalent, use 20A, if you go smaller, reduce the rating accordingly.
    It's been a while...

    Comment


    • #3
      the metric is mm sq not diameter or thickness which is why it doesn't measure out properly. For 20A you want 4mm sq which is a standard metric size
      Visit my site V8 Scimitar

      SP13000, 300GB SATA HD, 1GB DDR. Opus 150, K301 screen, Cisco WIFI, AQmax GPS, RoadRunner and FreeDrive, Sony MEX-R5 head unit. 4 years installed and it just keeps running!

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      • #4
        Originally posted by h3rk View Post
        They both should agree, it's simple geometry.........Or find a more reliable source of wire..........
        If you find 10AWG equivalent, use 20A, if you go smaller, reduce the rating accordingly.
        Originally posted by v8 scimitar View Post
        the metric is mm sq not diameter or thickness which is why it doesn't measure out properly. For 20A you want 4mm sq which is a standard metric size
        Thanks all - greatly appreciated.

        I could definitely understand the maths for diameter/area, which was adding to the confusion.

        In any case, armed with your thoughts and my research, I'll head down to an AutoBarn or a Strathfield store on the weekend. I reckon they're more into the Audio and In-Car Entertainment side of things, so I expect they'll have a more comprehensive range and available staff. In fairness to SuperCheapAuto, this stuff is probably not their specialty, and the store I went to was in the middle of a total renovation.

        Thanks again.

        Cheers,

        Long.1
        Worklog: 2006 Ford Territory Ghia (Melbourne, Australia)
        Mounting Components in Custom Carputer Box
        Attention Aussie's - Say G'day Here

        Comment


        • #5
          I can't even visualize an australian starting off a sentence with the words 'I recon'. Funny.
          It's been a while...

          Comment


          • #6
            Originally posted by long.1 View Post
            Thanks all - greatly appreciated.

            I could definitely understand the maths for diameter/area, which was adding to the confusion.

            In any case, armed with your thoughts and my research, I'll head down to an AutoBarn or a Strathfield store on the weekend. I reckon they're more into the Audio and In-Car Entertainment side of things, so I expect they'll have a more comprehensive range and available staff. In fairness to SuperCheapAuto, this stuff is probably not their specialty, and the store I went to was in the middle of a total renovation.

            Thanks again.

            Cheers,

            Long.1
            Definately go somewhere that has a better range of car audio stuff. Even try Dick Smith or Jaycar. They also have car audio gear.
            Just a note, we do use Gauge sizes (AWG) in OZ for car audio. Auto electricial guys mainly use mm squared.

            Originally posted by h3rk View Post
            I can't even visualize an australian starting off a sentence with the words 'I recon'. Funny.

            H3rk, You need to come here for a holiday. I can guarantee you'll leave saying it
            Never let the truth get in the way of a good story

            Comment


            • #7
              I intend to. In fact I thought I was going to when I joined the Navy, but I ended up locked up in a tube that may (or may not) have had several nuclear missles loaded in it, and not many foriegn ports wanted any part of that(nor our pentagon. Damn, I just got flagged.

              Oh well, one day.
              When I hear 'I recon', I picture Jeff Foxworthy or the like saying it, that's why I couldn't picture it.
              It's been a while...

              Comment


              • #8
                I can understand some cities not wanting a nuke sub in their ports. I suppose that is just the way it goes.
                Never let the truth get in the way of a good story

                Comment


                • #9
                  Originally posted by meddler View Post
                  Definately go somewhere that has a better range of car audio stuff. Even try Dick Smith or Jaycar......
                  Will do - thanks !!
                  Originally posted by h3rk View Post
                  .........When I hear 'I recon', I picture Jeff Foxworthy or the like saying it, that's why I couldn't picture it.
                  Don't get much exposure to Jeff Foxworthy down here (apart from mates sending the odd video link via email). I do recall one "bit" though where he was a brain surgeon with a thick redneck accent - hilarious !!
                  Worklog: 2006 Ford Territory Ghia (Melbourne, Australia)
                  Mounting Components in Custom Carputer Box
                  Attention Aussie's - Say G'day Here

                  Comment


                  • #10
                    Originally posted by long.1 View Post
                    In any case, armed with your thoughts and my research, I'll head down to an AutoBarn or a Strathfield store on the weekend.
                    Originally posted by meddler View Post
                    ....Even try Dick Smith or Jaycar. They also have car audio gear. Just a note, we do use Gauge sizes (AWG) in OZ for car audio........
                    OK, the Mrs was hosting some clothing party our place tonight so I took my 3 year old boy out for a fun filled evening of wiring and PC component shopping - wasn't he just pumped !!

                    Went to Dick Smith Superstore first - no joy. Then went to AutoBarn and wouldn't you know it, they had a choice of 8AWG or 12AWG. I chose 12AWG.

                    I got 3 metres of each wire (power/ground) as I plan to run both from the battery. My pc will most likely be going under the drivers seat (I know, I know - I'll be taking precautions), and my car battery is on the same side of the car. So given this distance, will I still be able to use the 20A fuse, or will a 15A be better ?

                    Cheers,

                    Long.1
                    Worklog: 2006 Ford Territory Ghia (Melbourne, Australia)
                    Mounting Components in Custom Carputer Box
                    Attention Aussie's - Say G'day Here

                    Comment


                    • #11
                      Use a 20A fuse. Make sure you have a fuse as close as possible to the battery. Standard practice is no more than 30cm-40cm away from the battery. This fuse is to protect the WIRING ONLY. We don't want any nasty accidental shorts of your power wire feeding the PSU.

                      I can't remember if there is a fuse on the PSU. From memory there isn't, so you will want to put a fuse there too to protect the PSU.


                      If you already know all this, tell me to mind my own business
                      Never let the truth get in the way of a good story

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