How to read toroidal transformer label

[cchean]

Looking at a Holden and Fisher toroidal transformer, the label says "Rating 30". Its a 15-0-15V transformer, not to big and I was wondering whether the 30 means 30VA or 30 amps???

 

[nigelwright7557]

You can tell by size of transformer.
It would be very big to pass 30 amps at 15 volts.
The rating is probably VA so 1A per winding max current.

 

[cchean]

Thanks Nigel. I thought the same. Your answer pretty much confirms what I suspected before.

I wonder whether it would be safe to use in circuits requiring more than 15V DC. I mean, after rectifying bridge, capacitors and all, if I build a regulated power supply.

 

[nigelwright7557]

By the time it is rectified and smoothed it will be around 21 volts.