DC transformer cable colours

DIYlady

Distinguished Member
Ive been set a transformer. Output cables are sleeved black and white, which is + and which is -
Thanks
 

Chris Muriel

Distinguished Member
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 ?
 

nheather

Distinguished Member
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
 

DIYlady

Distinguished Member
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
 

nheather

Distinguished Member
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:

DIYlady

Distinguished Member
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
 

its_all_Greek

Distinguished Member
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.
 

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