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Old 18th May 2003, 01:08 AM   #31
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keep working and if any question just ask........
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Old 23rd July 2010, 10:57 AM   #32
AJT is offline AJT  Philippines
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time to give this thread a second life....

most likely, the transformer primary had fewer turns than what was required, magnetizing current was probably high....

add to that a high primary voltage and you get a heated transformer.....
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Old 23rd July 2010, 11:42 AM   #33
AndrewT is offline AndrewT  Scotland
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Yes a mains transformer designed for 115/230Vac 60Hz will perform adequately. But has it been designed for universal use?
Will it work within specification if the supply voltage is 120/240Vac?
Will it .... is 127/254Vac (max tolerance of most mains)?
Will it work with 50Hz rather than 60Hz?
Will it still be within specification?

To be classed as a universal transformer it must remain in specification with 127/254Vac 50Hz as the worst case supply voltage.
I would expect it to be labeled:
110/120 or 220/240 Vac 50/60Hz
And for the manufacturer to publish the specification details that apply.
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