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I have an uncased, unlabeled step-down transformer which converts 240 UK voltage to 112v (I have measured this with a meter). It weighs 1.5kg, is 10 x 8 x 10.5cms including the attached 2-pin US socket. How can I determine it's maximum VA rating?

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As a half decent approximation compare its weight against catalogue transformers of a similar size. –  Andy aka May 10 '13 at 19:16
    
Do you have a picture of the transformer? Does it have a type plate? –  jippie May 10 '13 at 19:21
    
Isn't UK mains 230V nowadays, like the rest of Europe? –  Johan.A Sep 1 '13 at 9:07

1 Answer 1

You can never be sure without the datasheet of the manufacturer.

Rule of thumb for a non-welded iron EI core: 50 VA/kg.

This is a nice tool.

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