Strange toroid...

[roibm]

I bought two new toroids from schuro, the high-end 160VA 2x24V.
Something very strange about this 2 traffos is that their mains cable is very very thin. I'd say it is some 0.5mm(awg24), 0.65mm(awg22) at best. The secondarie cables are much thicker.
Can someone explain this to me?

[Carondimonio]

Well, primaries' wires are always thinner than the secondaries' ones, as they have to carry much less current. 0.5mm2 seems anyway a bit too thin...

[Carondimonio]

Well, I' ve found a table for the current limit vs. AWG:

AWG current limits

AWG24: max. 0.577A
AWG22: max. 0.92A

For 160 VA, AWG24 would be indeed too thin, AWG22 would be fine...

[roibm]

Well, I just took two wires, 0.5mm and 0.65mm, and the wire is in between, so it should be ok. still it would have been better to have at least 0.65

[Gasho]

I am surprised that toroids don´t have ticker and more robust wire outcames . Usualy the thin primary wire is soldered to ticker wires and fixed inside toroid by isolation tape. Your primar wires are very fragile and they can easely break.

[quasi]

If the transformer is to be used in an solid state class A/B amplifier then I wouldn't worry.

The transformer is rated at 160va. This means that it will deliver 160va (full power) at 25 degC all day and that the primaries will handle the rated input current all day too.

But music is nothing like this, even when the amp is played flat out. Under these conditions the average power the transformer is delivering is probably only around 30% (or less) of its rated power.

So if your worried about temperature rise of this transformer in an audio application then don't.

The only thing really to worry about is the voltage drop of the secondaries when the transformer is delivering a lot of power briefly.

Cheers