DC transformer cable colours

Discussion in 'General Chat' started by DIYlady, Dec 30, 2011.

  1. DIYlady

    DIYlady
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    Ive been set a transformer. Output cables are sleeved black and white, which is + and which is -
    Thanks
     
  2. Berties

    Berties
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    You don't have a multimeter? Also does it have polarity symbol on the transformer itself?
     
  3. Chris Muriel

    Chris Muriel
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    From what input voltage to what output voltage and at what maximum current (mesured in VA or watts) ?
    Could you post a picture or 2 of it ?
     
  4. nheather

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    Not sure what a DC Transformer is - I presume you mean DC power supply.

    As far as I know, there is no standard colour scheme.

    I'd put my money on Black=negative and White=positive but it would be best if you could test it with a meter before attaching to any equipment.

    Cheers,

    Nigel
     
  5. DIYlady

    DIYlady
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    Hi

    Yes dc power supply
    Unfortunately don't have a meter
    Black negative is what we think - just wanted another opinion
    Looking at output it looks like cable is coax with a continuously sheathed central white core and external wires gathered together and then black sheathing add

    Will see if I can add photos
     
  6. DIYlady

    DIYlady
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    Output 48V 0.75A
     

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  7. nheather

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    I would definitely say black is the negative because it is the shield of the cable - that would be the most sensible and normal convention - but it would be nice to check before connecting.

    What will it power by the way? It is remotely possible it doesn't matter what way round it is.

    Cheers,

    Nigel
     
    Last edited: Dec 30, 2011
  8. DIYlady

    DIYlady
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    Thanks
    It is going into a rako led driver and from there to some led lamps
    Problem is although Rako kit is nicely marked with + and - signs the colour changing lamps are not

    The lamps have 4 cables rgb and black. I'm planning on 4 lamps

    I was planning on just not using the black wire and just creating loop with red to red to red etc
     
  9. its_all_Greek

    its_all_Greek
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    If you connect the first lamp across the output then turn the lights on, If they light then they are connected the right way round, if they don't then swap the connections.

    i do concur though that it looks like the black is your negative.
     
  10. DIYlady

    DIYlady
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    Thanks all
    Everything working now :)
     

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