01-31-2015, 10:00 AM
If you have a scrap yard around you have a good place to frequent to find one. They don't like to bust up the transformer to get the copper around here. I'm guessing the old burn out ovens are also a thing of the past.
Transformers windings are current limited. If you find a 440 / 220 to 220 / 110 CPT (Control Power Transformer), hook it 220 to 220 and it is good for 1/2 the KVA rating on 120.
A transformer doesn't care which side is primary. You can take 2ea. 120 / 12 and hook them back to back for a 120 / 120. Lowest current winding is your KVA limit. Use a fuse - what have you lost if you smoke one anyway.
I also like a GFCI on my test bench feed. May not help, but gives me a warm fuzzy feeling.
Don't expect your smoke detector to tell you if a transformer is smoking unless it is an opacity type. Burning insulating varnish does not polarize.
Transformers windings are current limited. If you find a 440 / 220 to 220 / 110 CPT (Control Power Transformer), hook it 220 to 220 and it is good for 1/2 the KVA rating on 120.
A transformer doesn't care which side is primary. You can take 2ea. 120 / 12 and hook them back to back for a 120 / 120. Lowest current winding is your KVA limit. Use a fuse - what have you lost if you smoke one anyway.
I also like a GFCI on my test bench feed. May not help, but gives me a warm fuzzy feeling.
Don't expect your smoke detector to tell you if a transformer is smoking unless it is an opacity type. Burning insulating varnish does not polarize.
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