Power transformer standards (safety etc.,) for US

[[email protected]]

Could some electronics guru please provide pointers to
standard power transformer(for bench top power supplies)
standards, specifically for the US ? Each time I Google
for it, I get directed to some IEC Web sites, but I want
information specific to the US. Any hints, suggestions
would be of immense help.

 

[Paul E Bennett]

Could some electronics guru please provide pointers to
standard power transformer(for bench top power supplies)
standards, specifically for the US ? Each time I Google
for it, I get directed to some IEC Web sites, but I want
information specific to the US. Any hints, suggestions
would be of immense help.

The USA, like the majority of the rest of the World is using the IEC
standards in such devices. There are different IEC standards for medical
devices. You might find some links at UL.

--
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Paul E. Bennett IEng MIET.....<email://[email protected]>
Forth based HIDECS Consultancy.............<http://www.hidecs.co.uk>
Mob: +44 (0)7811-639972
Tel: +44 (0)1235-510979
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************

 

[Phil Allison]

Could some electronics guru please provide pointers to
standard power transformer(for bench top power supplies)
standards, specifically for the US ?

** In general, electrical test equipment is exempt from the usual safety
rules.

How about you ASK the question you actually want answered ?



.... Phil

 

[legg]

Could some electronics guru please provide pointers to
standard power transformer(for bench top power supplies)
standards, specifically for the US ? Each time I Google
for it, I get directed to some IEC Web sites, but I want
information specific to the US. Any hints, suggestions
would be of immense help.

UL1585 for Class2 and Class3 transformers.

UL also certifies transformer insulation systems (OBJS2) of compatible
tested materials, with varying temperature classes.

It's easier to apply a standard to the completed unit, (class 2 power
units ANSI/UL1310) than it is to find a standard relevent to one
specific component in it. After all, you are likely not just building
the transformer, or you wouldn't be asking the question.

RL

 

[josephkk]

Could some electronics guru please provide pointers to
standard power transformer(for bench top power supplies)
standards, specifically for the US ? Each time I Google
for it, I get directed to some IEC Web sites, but I want
information specific to the US. Any hints, suggestions
would be of immense help.

Not really sure what you want to know. A long time ago i learned that
1000 circular mils per ampere of current was standard conservative design
for 60 Hz power transformers. (copper loss thermal rise, laminated cores)
and 500 circular mils for "aggressive" designs. In these days of SMPS
most of these "rules of thumb" don't mean much. Serious loss calculations
and thermal design are really required. Up to you. Provide enough detail
on the requirements and what you have tried to calculate yourself first.

?-)