Talema Transformer Wiring

[RDV]

I just picked a 20v + 20v @ 5amps Talema transformer. It's supposed to be a single primary and dual secondary. I guess it's a few years old NOS so I can't find any info on any website.

There are two double insulated(orange covered by yellow) stranded wires, and there are four solid wires(black, white, red, & green).

Would anyone know the deal with these? Would the two stranded wires be the primary? That's the only thing that makes sense if this is a single primary/dual secondary transformer.

What's strange to me is the lighter(though double insulated) wires being the line voltage & the heavier being the 20v.

I also searched every post that mentions the word Talema and the only diagram I saw was not like this transformer.

Please advise.

RDV

[rpapps]

Originally posted by RDV

What's strange to me is the lighter(though double insulated) wires being the line voltage & the heavier being the 20v.

RDV [/B]

Hi RDV
It's all to do with current ratings. The secondary has to carry 5 Amps so is made of heavy wire. Because power in is roughly equal to power out (ignoring losses for simplicity) the same 200VA is being used in the primary circuit as in the secondary.
Secondary - 40 Volts X 5 Amps = 200VA
Primary - 200 VA/120 Volts = 1.66 Amps.
As I mentioned above, the actual primary current will be a litttle higher.
Cheers
Rob

[RDV]

So you think the stranded wires would be the primary? I just don't want to smoke this thing.

RDV

[RDV]

A picture of the beast.

RDV

[rpapps]

Hi
It's a fairly safe bet but, as has been mentioned numerous times in other forums, wire a light bulb in series with the primary the first time you power it up. That way, if any thing is seriously wrong, the bulb lights up and the smoke stays in the transformer.
Cheers
Rob

[RDV]

I got continuity between the two yellow wires, between the black & white, and between the red & green. I believe I know what I've got here now.

RDV